datavorous/entrance-exam-dataset huggingface dataset:
Which of the following characteristics of s-block elements is reflected in the nature of their oxides, halides, and oxosalts?

Options:
A Smaller atomic sizes and higher ionization enthalpies
B Larger atomic sizes and higher ionization enthalpies
C Larger atomic sizes, lower ionization enthalpies, and variable oxidation states
D Smaller atomic sizes, lower ionization enthalpies, and variable oxidation states

The correct answer is:
Larger atomic sizes, lower ionization enthalpies, and variable oxidation states

Solution:
Correct Option is : (C)
Larger atomic sizes, lower ionization enthalpies, and variable oxidation states

Topic: Chemistry, s Block Elements, NEET
Which of the following characteristics represent 'Inheritance of blood groups' in humans?

i. Dominance
ii. Co-dominance
iii. Multiple alleles
iv. Incomplete dominance
v. Polygenic inheritance

Options:
A ii, iv and v
B i, ii and iii
C ii, iii and v
D i, iii and v

The correct answer is:
i, ii and iii

Solution:
Dominance -( IAIO, IBIO)- the phenomenon whereby, in an individual containing two allelic forms of a gene, one is expressed to the exclusion of the other.
Codominance -( IAI B)- a form of dominance wherein the alleles of a gene pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is neither dominant nor recessive.
Multiple alleles- IA, IB & IO - 3-different allelic forms of a gene.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2018
Which of the following characteristics represent 'Inheritance of blood groups' in humans?

i. Dominance
ii. Co-dominance
iii. Multiple alleles
iv. Incomplete dominance
v. Polygenic inheritance

Options:
A ii, iv and v
B i, ii and iii
C ii, iii and v
D i, iii and v

The correct answer is:
i, ii and iii

Solution:
Dominance –( IAIO, IBIO)- the phenomenon whereby, in an individual containing two allelic forms of a gene, one is expressed to the exclusion of the other.
Codominance -( IAI B)- a form of dominance wherein the alleles of a gene pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is neither dominant nor recessive.
Multiple alleles- IA, IB & IO - 3-different allelic forms of a gene.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following characters are common in plants like Indigofera, Sesbania, groundnut, and gram?

Options:
A Shows zygomorphic flowers
B Belongs to family Fabaceae
C Shows actinomorphic flowers
D Both a and b

The correct answer is:
Both a and b

Solution:
Indigofera (dye), Sesbania (fodder), groundnut (oil yielding plant), and gram (pulse) all are members of the Fabaceae family which shows zygomorphic flowers due to vexillary aestivation.

Topic: Biology, Morphology of Flowering Plants, NEET
Which of the following characters are seen in an individual with trisomy of chromosome number 21?
A. Psychomotor and mental development is retarded
B. Mental retardation
C. Presence of gynaecomastia
D. Loss of skin pigmentation

Options:
A Only A is correct
B Only A & B are correct
C Only A, B & C are correct
D All are correct

The correct answer is:
Only A & B are correct

Solution:
Down's Syndrome: The cause of this genetic disorder is the presence of an additional copy of chromosome number 21 (trisomy of 21). This disorder was first described by Langdon Down (1866). The affected individual is short-statured with a small round head, furrowed tongue and partially open mouth. Palm is broad with characteristic palm crease. Physical, psychomotor and mental development is retarded.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following characters of pea plants chosen by Mendel had the contrasting traits of green and yellow?

Options:
A Flower colour
B Pod colour
C Seed colour
D Both (b) and (c)

The correct answer is:
Both (b) and (c)

Solution:
Mendel selected pea plant for their contrasting characters and these 7 characters and their contrasting traits are:
1. Stem height: tall/dwarf
2. Flower colour: violet/white
3. Flower position: axial/terminal
4. Pod shape: inflated/constricted
5. Pod colour: green/yellow
6. Seed shape: round/wrinkled
7. Seed colour: yellow/green

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following characters stands true for Antedon?

Options:
A Spiny-bodied and organ level of organisation
B Mouth on the dorsal side and anus on the ventral side
C Exclusively marine and triploblastic
D Has a pseudocoelom

The correct answer is:
Exclusively marine and triploblastic

Solution:
Antedon or sea lily belongs to the phylum Echinodermata. All are marine with an organ-system level of organisation. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical. They are triploblastic and coelomate animals. The digestive system is complete with the mouth on the lower (ventral) side and anus on the upper (dorsal) side.

Topic: Biology, Animal Kingdom, NEET
Which of the following characters studied by Mendel in garden pea was found to be dominant?

Options:
A Green seed colour
B Terminal flower position
C Green pod colour
D Wrinkled seed

The correct answer is:
Green pod colour

Solution:
Dominant	Recessive
Green pod colour	Yellow pod colour
Yellow seed colour	Green seed colour
Axial flower	Terminal flower
Round shape seed	Wrinkled seeds

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following characters was not chosen by Mendel?

Options:
A Pod shape
B Pod colour
C Location of flower
D Location of pod

The correct answer is:
Location of pod

Solution:
Johann Mendel, considered as the father of genetics, gave the observation and theories of inheritance of characteristics. He made his conclusions bases on experiments conducted on Pisum sativum, pea plant. In the plant he had considered seven characteristics - seed shape, seed colour, pod shape, pod colour, stem height, flower colour, flower position/location.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following checkpoint is predominantly activated when the DNA has started forming replication fork?

Options:
A G 1 /S
B G 2 /M
C M
D Both G 2 /M and M

The correct answer is:
G 1 /S

Solution:
There are three known checkpoints: the G1 checkpoint, also known as the restriction or start checkpoint or major checkpoint; the G2/M checkpoint; and the metaphase checkpoint, also known as the spindle checkpoint.
The primary G1/S cell cycle checkpoint controls the commitment of eukaryotic cells to transition through the G1 phase to enter into the DNA synthesis in S phase

Topic: Biology, Cell Cycle and Cell Division, NEET
Which of the following chemical equation represents the formation of colloidal solution-

Options:
A Cu+CuC l 2 →C u 2 C l 2
B 2Mg+C O 2 →2MgO+C
C 2HN O 3 +3 H 2 S→3S+4 H 2 O+2NO
D Both (B) and (C)

The correct answer is:
2HN O 3 +3 H 2 S→3S+4 H 2 O+2NO

Solution:
This is an example of peptization which will create a negatively charged colloid

Topic: Chemistry, Surface Chemistry, NEET
Which of the following chemical equations is balanced correctly?

Options:
A 2I2+ 3N2O3→ 4NO2+ I2O3
B I2+ 10NO3-+ 8H+→ 10NO2+ 2IO3-+ 4H2O
C 3I2+ 2N2O3→ 4NO2+ I2O3
D 3I2+ 10NO3-+ 8H+→ 11NO2+ 2IO3-+ 4H2O

The correct answer is:
I2+ 10NO3-+ 8H+→ 10NO2+ 2IO3-+ 4H2O

Solution:
Correct Option is : (B)
I2+ 10NO3-+ 8H+→ 10NO2+ 2IO3-+ 4H2O

Topic: Chemistry, Redox Reactions, NEET
Which of the following chemical equations represents the balanced reaction in which dichlorine heptaoxide (Cl2O7) in the gaseous state combines with an aqueous solution of hydrogen peroxide in an acidic medium to produce chlorite ions (ClO2–) and oxygen gas?

Options:
A 2Cl2O7(g) + 8H2O2(aq) + 12H+(aq) → 4ClO2–(aq) + 12H2O(l) + 7O2(g)
B 2Cl2O7(g) + 2H2O2(aq) + 2H+(aq) → 2ClO2–(aq) + 2H2O(l) + O2(g)
C Cl2O7(g) + 4H2O2(aq) + → 2ClO2–(aq) + 2H++ 4O2(g)
D 3Cl2O7(g) + 4H2O2(aq) + → 6ClO2–(aq) + 4H2O(l) + 3O2(g)

The correct answer is:
Cl2O7(g) + 4H2O2(aq) + → 2ClO2–(aq) + 2H++ 4O2(g)

Solution:
Correct Option is : (C)
Cl2O7(g) + 4H2O2(aq) + → 2ClO2–(aq) + 2H++ 4O2(g)

Topic: Chemistry, Redox Reactions, NEET
Which of the following chemical reactions show how hydrogen peroxide can act as a oxidising agent?

Options:
A I2+ 2H2O2+3OH-→ I-+2H2O+3O2
B I2+H2O2+2OH-→2I-+2H2O+O2
C 2Fe2++ H2O2→2Fe3++2OH-
D HOCl + H2O2→H3O++Cl-+O2

The correct answer is:
2Fe2++ H2O2→2Fe3++2OH-

Solution:
Correct Option is : (C)
2Fe2++ H2O2→2Fe3++2OH-

Topic: Chemistry, Hydrogen, NEET
Which of the following chemical reactions show how hydrogen peroxide can act as a reducing agent?

Options:
A HOCl + H2O2→H3O++Cl-+O2
B 2Fe2++ H2O2→2Fe3++2OH-
C Mn2++ H2O2→ Mn4++2OH-
D Pbs + 4H2O2→PbSO4+4H2O

The correct answer is:
HOCl + H2O2→H3O++Cl-+O2

Solution:
Correct Option is : (A)
HOCl + H2O2→H3O++Cl-+O2

Topic: Chemistry, Hydrogen, NEET
Which of the following chemical reactions show the amphoteric nature of water?

Options:
A NaOH + H2O → Na++ OH-+ H2
B 2H2O ⇌ H3O++ OH-
C H2O + NH3→ NH4++ OH-
D H2O + CO2→ H2CO3

The correct answer is:
2H2O ⇌ H3O++ OH-

Solution:
Correct Option is : (B)
2H2O ⇌ H3O++ OH-

Topic: Chemistry, Hydrogen, NEET
Which of the following chemical reactions with water that Cl2O7is an acidic oxide?

Options:
A Cl2O7+ H2O → 2HClO3
B Cl2O7+ H2O → 2HCl + O2
C Cl2O7+ H2O → H2Cl2O7
D Cl2O7+ H2O → 2HClO4

The correct answer is:
Cl2O7+ H2O → 2HClO4

Solution:
Correct Option is : (D)
Cl2O7+ H2O → 2HClO4

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following chemical reactions with water that Na2O is a basic oxide?

Options:
A Na2O + H2O → 2NaOH
B Na2O + H2O → 2H2O + Na2
C Na2O + H2O → H2O + Na2O2
D Na2O + H2O → NaOH + H2O

The correct answer is:
Na2O + H2O → 2NaOH

Solution:
Correct Option is : (A)
Na2O + H2O → 2NaOH

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following chemical reagent can provide distinction between the two ionisation isomers of the formula Co(NH3)5BrSO4 ?

Options:
A BaCl2 solution
B dil. HCl
C dil. H2SO4
D Fenton's reagents

The correct answer is:
BaCl2 solution

Solution:
The two ionisation isomers are [Co(NH3)5SO4]Br and [Co(NH3)5Br]SO4 .
The later will give white precipitate of BaSO4 with BaCl2 solution but former will not give precipitate.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following chemical system is non aromatic?

Options:
A

B

C

D

The correct answer is:

Solution:
Hackle rule $(4 n+2) \pi$ electron is used to distinguish whether a compound is aromatic or non aromatic. The compound (4) has $4 \pi e^{-}$and thus it does not follow $(4 n+2)$ rule
is non aromatic.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2013 (Karnataka)
Which of the following chemical system is non aromatic?

Options:
A
B
C
D

The correct answer is:

Solution:
The molecules which do not satisfy Huckel rule or (4n+2)π -electron rule and conditions of aromaticity are said to be non-aromatic. The compound D has total 4πe- so it does not follow (4n+2) rule and coplanarity is lost in it so it is non-aromatic compound. All other compounds (A, B, C) are planar and have 6πe- (option A and C) and 10πe- (option D) , so they are aromatic.

sp3

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following chemical test can distinguish between methylamine and dimethylamine?

Options:
A

Carbylamines test

B

Fehling's test

C

Lucas test

D

Tollen’s test

The correct answer is:

Carbylamines test

Solution:
Methylamine and Dimethylamine : They can be distinguished by carbylamines test. When heated with alcoholic solution of KOH and chloroform, methylamine gives foul smell of methyl isocyanide.

C H 3 âN H 2 +CHC l 3 +3âKOHâC H 3 âNC+3âKCl+3â H 2 O âmethylamineâââââââââââââââââââââââââââââââââMethylâisocyandeâ âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ(foulâsmell)

dimethylamine does not give carbylamines test

( C H 3 ) 2 NH â CHâC l 3 ,âKOH Noâreaction Dimethylamine

Topic: Chemistry, Amines, NEET
Which of the following circuit is used to verify Ohm's law?

Options:
A
B
C
D

The correct answer is:

Solution:
Since, we know that an ammeter is always connected in series and a voltmeter is always connected parallel.
Thus, the correct circuit is given in option ( A ).

Topic: Physics, Current Electricity, NEET
Which of the following class of enzymes catalyses hydrolysis of ester, ether, peptide, glycosidic, C-C, C-halide or P-N bonds.?

Options:
A Oxidoreductases/dehydrogenases
B Transferases
C Hydrolases
D Lyases

The correct answer is:
Hydrolases

Solution:
Hydrolases catalyses hydrolysis of ester, ether, peptide, glycosidic, C-C, C-halide or P-N bonds

Topic: Biology, Biomolecules (B), NEET
Which of the following classification is based on some morphological characters only?

Options:
A Artificial classification
B Natural classification
C Phylogenetic classification
D Both A and B

The correct answer is:
Artificial classification

Solution:
In artificial classification, a few superficial morphological characters are considered and classification is done on the basis of few morphological characters due to which closely related species are widely placed. In natural classification, gross morphological characters are considered and similarities and dissimilarities between organism are studied. Classification based on evolutionary history is called a phylogenetic classification.

Topic: Biology, Biological Classification, NEET
Which of the following colloidal systems describe emulsions?

Options:
A Solid-liquid
B Liquid-liquid
C Gas-solid
D Gas-liquid

The correct answer is:
Liquid-liquid

Solution:
The paragraph specifies that the colloidal systems discussed are liquid-liquid systems.

Topic: Chemistry, Surface Chemistry, NEET
Which of the following combination does not evolve Cl2 gas?

Options:
A HCl (aq) +KMnO4
B HCl + MnO2
C HCl+I2
D HCl+F2

The correct answer is:
HCl+I2

Solution:
8HCl+KMnO4→MnCl2+Cl2↑+KCl+4H2O
4HCl+MnO2→MnCl2+Cl2↑+2H2O
HCl+I2→ No reaction
HCl+F2→HF+Cl2↑

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following combination does not liberate NH3 gas?

Options:
A Heating of NH4ClO4
B Heating of NH4Cl
C (NH4)2CO3+NaOH
D Li3N+H2O

The correct answer is:
Heating of NH4ClO4

Solution:
Heating of NH4ClO4 does not liberate NH3 gas but gives N2 and Cl2
2NH4ClO4→ΔN2↑+Cl2↑+2O2↑+4H2O
Rest all here on heating gives ammonia
NH4Cl→ΔNH3↑+HCl↑
(NH4)2CO3+2NaOH→2NH3+Na2CO3+H2O
Li3N+3H2O→3LiOH+NH3↑

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following combination does not liberate NH3 gas?

Options:
A Heating of NH4ClO4
B Heating of NH4Cl
C NH42CO3+NaOH
D Li3N+H2O

The correct answer is:
Heating of NH4ClO4

Solution:
Heating of NH4ClO4 does not liberate NH3 gas but gives nitrogen.
2NH4ClO4→ΔN2↑+Cl2↑+2O2↑+4H2O
Rest all give ammonia on heating as follows
NH4Cl→ΔNH3↑+HCl↑
(NH4)2CO3+2NaOH→2NH3+Na2CO3+H2O
Li3N+3H2O→3LiOH+NH3↑

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following combination doesn’t evolve Cl2 gas?

Options:
A HCl(aq.)+KMnO4
B HCl+MnO2
C HCl+I2
D HCl+F2

The correct answer is:
HCl+I2

Solution:
Here HCl+I2 combination doesn’t evolve Cl2 gas
8HCl+KMnO4→MnCl2+52Cl2↑+KCl+4H2O
4HCl+MnO2→MnCl2+Cl2↑+2H2O
HCl+I2→Noreaction
HCl+F2→HF+Cl2↑

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following combination of characters is correct for slime moulds?

Options:
A Parasitic, plasmodium without walls, spores dispersed by air currents
B Saprophytic, plasmodium with walls, spores dispersed by water
C Parasitic, plasmodium without walls, spores dispersed by water
D Saprophytic, plasmodium without walls, spores dispersed by air currents

The correct answer is:
Saprophytic, plasmodium without walls, spores dispersed by air currents

Solution:
Slime moulds are saprophytes found in the kingdom Protista. These saprophytes under suitable conditions form aggregates called plasmodium without walls, which grows and spreads to several feet. When the conditions are not favourable, these organisms differentiate and form spores with true walls, resistant and are dispersed by air currents.

Topic: Biology, Biological Classification, NEET
Which of the following combination of parents can produce a child with erythroblastosis fetalis?

Options:
A Rh-ve Mother and Rh+ve Father
B Rh+ve Mother and Rh-ve Father
C Rh+ve Mother and Rh+ve Father
D Rh-ve Mother and Rh -ve Father

The correct answer is:
Rh-ve Mother and Rh+ve Father

Solution:
Erythroblastosis fetalis occurs due to Rh incompatibility. It occurs in the second and subsequent Rh+ve foetus in an Rh-ve mother. Rh factor is produced on our RBCs by a dominant gene 'R'. Hence, the genotype of Rh-ve mother is 'rr'. To have a baby which is Rh+ve, the father has to be Rh+ve with genotype 'RR' or 'Rr'.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following combination of reagents does not undergo redox reaction in aqueous medium?

Options:
A SnCl2+HgCl2
B CuSO4+KCN
C Pb(CH3COO)2+KI
D Ag2O+SO2

The correct answer is:
Pb(CH3COO)2+KI

Solution:
Here only reaction between Lead acetate and KI is not a redox reaction while rest other are redox reactions
A. SnCl2+HgCl2→RedoxHg↓SnCl4s
B. CuSO4+KCN→K2SO4+CuCN2↓→Spontaneous(R.T.)CuCN↓+CN2↑
C. PbCH3COO2+KI→Ion exchange reactionPbI2↓+CH3COOK
D. Ag2O+SO2→RedoxAg+SO3↑

Topic: Chemistry, Redox Reactions, NEET
Which of the following combinations is correct?

Options:
A Metal ions loosely attached with Apoenzyme-Activators.
B Non-protein organic part attached tightly to the Apoenzyme-Prosthetic group.
C Non-protein organic part attached loosely to the Apoenzyme-Coenzyme.
D all of these.

The correct answer is:
all of these.

Solution:
The protein part of enzymes is called apoenzyme. Prosthetic groups are organic compounds and are distinguished from other cofactors in that they are tightly bound to the apoenzyme. Coenzymes are also organic compounds, but their association with the apoenzyme is only transient.

Topic: Chemistry, Biomolecules, NEET
Which of the following combinations of characters is true for slime moulds?

Options:
A Parasitic, plasmodium with true walls, spores dispersed by air currents
B Saprophytic, plasmodium without walls, spores dispersed by water
C Parasitic, plasmodium without walls, spores dispersed by water
D Saprophytic, plasmodium without walls, spores dispersed by air currents

The correct answer is:
Saprophytic, plasmodium without walls, spores dispersed by air currents

Solution:
The members of fungal class-Myxomycetes are commonly called true slime moulds. These are saprophytic and their vegetative phase is represented by a free living irregularly shaped mass of protoplasm without walls and having several diploid nuclei embedded in it. It is called plasmodium. During reproduction, slime moulds produce haploid spores, which are dispersed by air currents, rain and mites.

Topic: Biology, Biological Classification, NEET
Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?

Options:
A R=20 Î©, L=1.5 H, C=35 Î¼F
B R=25Â Î©,Â L=2.5Â H,Â C=45Â Î¼F
C R=15 Î©, L=3.5 H, C=30 Î¼F
D R=25 Ω, L=1.5 H, C=45 μF

The correct answer is:
R=15 Î©, L=3.5 H, C=30 Î¼F

Solution:
Quality factor is defined at resonance, when, inductive reactance is equal to the capacitive reactance.

It is defined as the ratio of voltage across the inductor or the capacitor and applied voltage or voltage across the resistor.

At resonance, impedance is equal to pure resistance, then, applied voltage and current are in phase.

Hence, the current is maximum.

Q=1RLC.

Q factor should be high.

Topic: Physics, Alternating Current, NEET, NEET 2016 (Phase 2)
Which of the following combinations will produce H2 gas?

Options:
A Zn metal and NaOHaq
B Au metal and NaCNaq in the presence of air
C Cu metal and conc. HNO3
D Fe metal and conc. HNO3

The correct answer is:
Zn metal and NaOHaq

Solution:
(i) Zn+2NaOHâNa2ZnO2+H2
(ii) 4Au+8NaCN+O2+2H2Oâ4NaAuCN2+ 4NaOH
(iii) Câ¡ uâ¡ + 4 Hâ¡ Nâ¡ Oâ¡ 3 â Câ¡ uâ¡ Nâ¡ Oâ¡ 3 2 + 2 Nâ¡ Oâ¡ 2 + 2 Hâ¡ 2 Oâ¡ conc.
(iv) Formation of passive layer of Fe2O3 on the surface of Fe and NO2 gas is evolved.
Fe+4HN O 3 âFe ( N O 3 ) 3 +N O 2 + 1 2 O 2

Topic: Chemistry, d and f Block Elements, NEET
Which of the following combine(s) with nitrogen to form nitride?

Options:
A Li
B Mg
C Na
D Both A and B

The correct answer is:
Both A and B

Solution:
Lithium and Magnesium react with nitrogen to form nitride as follows
6Li+N2→2Li3N
3Mg+N2→Mg3N2

Topic: Chemistry, s Block Elements, NEET
Which of the following comparisons is correct?

Options:
A Number of recorded animals < number of recorded plants
B Number of national parks in India < number of biodiversity hotspots in the world
C Number of varieties of mango in India > number of varieties of rice in India
D The percentage of mammals facing the threat of extinction < the percentage of amphibians facing the threat of extinction

The correct answer is:
The percentage of mammals facing the threat of extinction < the percentage of amphibians facing the threat of extinction

Solution:
More than 70% of all the species recorded are animals, whereas plants comprise no more than 22% of the total. The total number of biodiversity hotspots in the world is 36, whereas India now has 90 national parks. India has more than 50,000 genetically different strains of rice and 1,000 varieties of mango. In the world, 23% of all mammal species, 32% of all amphibian species face the threat of extinction.

Topic: Biology, Biodiversity and its Conservation, NEET
Which of the following complex compound is “Pentaaquacyanidoiron (III) trichloridotricyanido cobaltate (III)”?

Options:
A [FeCN(H2O)5][CoCl3(CN)3]
B [FeCN(H2O)5][CoCl3(CN)3]3
C [Fe(CN)2(H2O)4]3[FeCl3(CN)3]2
D [Fe(CN)(H2O)5]3[CoCl3(CN)3]2

The correct answer is:
[Fe(CN)(H2O)5]3[CoCl3(CN)3]2

Solution:
In “Pentaaquacyanido Iron (III) trichloridotricyanido cobaltate (III)”
Complex cation is [FeIII(CN)(H2O)5]2+ and complex anion is [CoIIICl3(CN)3]3-
Therefore complex is [Fe(CN)(H2O)5]3[CoCl3(CN)3]2

Topic: Chemistry, Coordination Compounds, NEET
Which of the following complex compound is “Pentaaquacyanidoiron (III) trichloridotricyanido cobaltate (III)”?

Options:
A [FeCN(H2O)5][CoCl3(CN)3]
B [FeCN(H2O)5][CoCl3(CN)3]3
C [Fe(CN)2(H2O)4]3[FeCl3(CN)3]2
D [Fe(CN)(H2O)5]3[CoCl3(CN)3]2

The correct answer is:
[Fe(CN)(H2O)5]3[CoCl3(CN)3]2

Solution:
D. In “Pentaaquacyanido Iron (III) trichloridotricyanido cobaltate (III)”
Complex cation is [FeIII(CN)(H2O)5]2+ and complex anion is [CoIIICl3(CN)3]3-
Therefore complex is [Fe(CN)(H2O)5]3[CoCl3(CN)3]2

Topic: Chemistry, Coordination Compounds, NEET
Which of the following complex does not show optical isomerism?

Options:
A [CoNH3)3Cl3
B [Coen)2Cl2Cl
C [Coen)3Cl3
D [CoenNH3)2Cl2Cl

The correct answer is:
[CoNH3)3Cl3

Solution:
[CoNH3)3Cl3 does not have optical isomers because it is of formula MA3B3 which exist as facial and meridinal isomers which does not show optical isomerism.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following complex has same oxidation state of the central atom in the cationic and anionic part?

Options:
A [Pt(Py)4][PtCl4]
B [Pt(NH3)4][PtCl6]
C [Pt(NH3)4Cl2][PtCl4]
D In all the above

The correct answer is:
[Pt(Py)4][PtCl4]

Solution:
[Pt(Py)4][PtCl4] This complex exist as [Pt(Py)4]2+[PtCl4]2- it means in both the parts the oxidation number of Pt is +2.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following complex ion is not expected to absorb visible light?

Options:
A [Ni(H2O)6]2+
B [Ni(CN)4]2-
C [Cr(NH3)6]3+
D [Fe(H2O)6]2+

The correct answer is:
[Ni(CN)4]2-

Solution:
Here in [Ni(CN)4]2- Ni is in Ni2+ state and have no unpaired d e- hence no d-d e- transition is possible. In rest other complexes metal ion has unpaired electrons in d-orbitals so d-d electronic transition is possible so absorb light.

Topic: Chemistry, Coordination Compounds, NEET