datavorous/entrance-exam-dataset huggingface dataset:
In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

Options:
A Al3+<Mg2+<Na+<F- (increasing ionic size)
B B<C<N<O (increasing first ionization enthalpy)
C I < Br < F < Cl (increasing electron gain enthalpy)
D Li<Na<K<Rb (increasing metallic radius)

The correct answer is:
B<C<N<O (increasing first ionization enthalpy)

Solution:
N is having ns2 np3 (Half-filled configuration) which is extra stable electronic configuration, so high amount of energy will be required to remove outermost electron. Hence,N has high IP than O which is having ns2 np4 electronic configuration.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET, NEET 2016 (Phase 1)
In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

Options:
A I < Br < F < Cl (increasing magnitude of electron gain enthalpy)
B Li < Na < K < Rb (increasing metallic radius)
C Al3+ < Mg2+ < Na+ < F (order of ionic radius)
D B < C < N < O (increasing first ionization enthalpy)

The correct answer is:
B < C < N < O (increasing first ionization enthalpy)

Solution:
As the correct order of increasing first ionisation enthalpy is B < C < O < N so option D is wrong. Rest other options are correct.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
In which of the following organism, males are heterogametic and have chromosome number different than females?

Options:
A Drosophila
B Human
C Birds
D Bugs

The correct answer is:
Bugs

Solution:
XO type (XX-XO type):

It is observed in large number of insects, grasshopper. Numbers of chromosomes are different in male and female individuals.

Here, female shows homogameity (XX) while male shows hetrogameity (XO). It is clear that, all eggs (ova) bear an additional X-chromosome besides the autosomes while only 50% of the sperms bear X-chromosomes. In grasshopper, eggs fertilized by (A+X) type sperm become females while those fertilized by (A+O) type sperm become males. Therefore, sperm determines the sex of the offsprings.

Topic: Biology, Principles of Inheritance and Variation, NEET
In which of the following organism, pigments are similar to that found in higher plants?

Options:
A Nostoc
B Euglena
C Gonyaulax
D Slime mould

The correct answer is:
Euglena

Solution:
Euglena is photosynthetic in the presence of sunlight. When deprived of sunlight, they behave like heterotrophs by predating on other smaller organisms. Interestingly, the pigments of euglenoids are identical to those present in higher plants.

Topic: Biology, Biological Classification, NEET
In which of the following organism the regulation of blood flow cannot be precisely regulated?

Options:
A Pila
B Limulus
C Scoliodon
D Octopus

The correct answer is:
Limulus

Solution:
Pila, octopus and Scoliodon have closed circulatory systems. The Limulus is an arthropod with an open circulatory system. Blood flow can be precisely regulated in a closed circulatory system where blood flows inside the blood vessels.

Topic: Biology, Animal Kingdom, NEET
In which of the following organisms, self-fertilization is seen?

Options:
A Fish
B Roundworm
C Earthworm
D Liver fluke

The correct answer is:
Liver fluke

Solution:
Fishes are chordates and roundworms belong to the phylum Aschelminthes. In these two organisms, the sexes are separate hence self-fertilization is not possible. Earthworms are hermaphrodite as both the sexes are present in the same body. Earthworms still do not show self-fertilization as the maturing times of both the sex organs are different. In earthworms, the male gonads mature earlier than female gonads. This is known as a protandry condition. Thus it shows cross-fertilization. In liver fluke both cross and self-fertilization is seen as they are hermaphrodites. It shows both the sex organs and thus self-fertilization is commonly seen.

Topic: Biology, Animal Kingdom, NEET
In which of the following organisms, the feature of menstrual cycle during sexual reproduction is observed?

(a) Most seasonal breeders

(b) Human females

(c) Old-world monkeys and apes

(d) Tiger

Options:
A (b), (c) & (d)
B (b) & (c)
C (c) & (d)
D (a) & (b)

The correct answer is:
(b) & (c)

Solution:
The reproductive cycle in the female primates (e.g. monkeys, apes and human beings) is called menstrual cycle. In non-primate mammals like cows, sheep, rats, deers, dogs, tiger, etc., such cyclical changes during reproduction are called oestrus cycle.

Topic: Biology, Human Reproduction, NEET
In which of the following organisms the regulation of blood flow cannot be precisely regulated?

Options:
A Pheretima
B Mosquito
C Labeo
D Cuttlefish

The correct answer is:
Mosquito

Solution:
Blood flow can be precisely regulated in a closed circulatory system where blood flows inside the blood vessels. Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels.
Open circulatory system is present in arthropods and molluscs (except Cephalopoda) in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. Mosquito is an arthropod hence it has open circulatory system.

Topic: Biology, Body Fluids and Circulation, NEET
In which of the following, oxidation number of chlorine is + 5 ?

Options:
A Cl 2 O 7
B ClO 3 -
C ClO -
D ClO 4 -

The correct answer is:
ClO 3 -

Solution:
ClO 3 - ,
x + 3 - 2 = - 1
x - 6 = - 1
x = 6 - 1
x = 5

Topic: Chemistry, Redox Reactions, NEET
In which of the following oxo-acids of sulphur S–O–O–S Link is present?

Options:
A Caro’s acid
B Marshell’s acid
C Sulphurous acid
D None of these

The correct answer is:
Marshell’s acid

Solution:
S–O–O–S Link is present in Marshell’s acid (H2S2O8) i.e, peroxy disulphuric acid.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
In which of the following pair both the species have $s p^3$ hybridization?

Options:
A $\mathrm{SiF}_4, \mathrm{BeH}_2$
B $\mathrm{NF}_3, \mathrm{H}_2 \mathrm{O}$
C $\mathrm{NF}_3, \mathrm{BF}_3$
D $\mathrm{H}_2 \mathrm{~S} \mathrm{BF}_3$

The correct answer is:
$\mathrm{NF}_3, \mathrm{H}_2 \mathrm{O}$

Solution:
Key concept - Hybridization
\(Z=\frac{1}{2}\left(\text { No. of valence } e^{-} \text {of central atom }+\text { Monovalent atom }+ \text { charge } \right)\)
\(\begin{aligned}
& \text {(1) } \mathrm{H}_2 \mathrm{~S}, B \mathrm{~F}_3 \\
& \mathrm{H}_2 \mathrm{~S}=\frac{1}{2}(8+2)=4 S p^3 \\
& B F_3=\frac{1}{2}(3+3)=3 s p^2
\end{aligned}\)
\(\begin{aligned}
\text {(2) } \operatorname{SiF}_4 & =\frac{1}{2}(4+4)=4 s p^3 \\
B C H_2 & =\frac{1}{2}(2+2)=2 \mathrm{Sp}
\end{aligned}\)
\(\begin{aligned}
\text {(3) } & N f_3=\frac{1}{2}(5+3)=4 s p^3 \\
& H_2 O=\frac{1}{2}(6+2)=4 S p^3
\end{aligned}\)
\(\begin{aligned}
\text {(4) } & N F_3 \\
= & \frac{1}{2}(5+3)=4 s p^3 \\
& B F_3=\frac{1}{2}
\end{aligned}\)

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2013 (Karnataka)
In which of the following pair the occurrence of dikaryophase of fungus can be observed?

Options:
A Ascomycetes and Basidiomycetes
B Phycomycetes and Ascomycetes
C Phycomycetes and Basidiomycetes
D Basidiomycetes and Dueteromycetes

The correct answer is:
Ascomycetes and Basidiomycetes

Solution:
In the sexually reproducing fungus group, basidiomycetes and ascomycetes display a phase called dikaryophase. In this phase, dikaryon is formed where two nuclei stage is formed in the cell which later fuse and form diploid.

Topic: Biology, Biological Classification, NEET
In which of the following pairs A is more stable than B?

Options:
A
B
C
D

The correct answer is:

Solution:
Ph 3 C â¢ ââ>â CH 3 C â¢
In Ph 3 C â¢ e â undergoes in delocalization while CH 3 C â¢ is stable due to the +I and hyperconjugation effect of â CH 3 group, because resonance is a predominant factor so the order is above

Topic: Chemistry, General Organic Chemistry, NEET
In which of the following pairs are both the ions coloured in aqueous solution-
[At. No. : \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=29, \mathrm{Co}=27\)]

Options:
A \(\mathrm{Ni}^{2+}, \mathrm{Ti}^{3+}\)
B \(\mathrm{Sc}^{3+}, \mathrm{Ti}^{3+}\)
C \(\mathrm{Sc}^{3+}, \mathrm{Co}^{2+}\)
D \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{+}\)

The correct answer is:
\(\mathrm{Ni}^{2+}, \mathrm{Ti}^{3+}\)

Solution:
$\mathrm{Ti}^{3+}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^1$
$$
\mathrm{Sc}^{3+}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6
$$
(Unpaired electron absent in d-orbital)
$$
\mathrm{Cu}^{+}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^{10}
$$
Thus, $\mathrm{Cu}^{+}$has completely occupied $d$-orbital.
Hence, in the above ions, $\mathrm{Ni}^{2+}$ and $\mathrm{Ti}^{3+}$ ions are coloured ions in the aqueous solution because of the presence of unpaired electrons in the $d$-subshell.
Related Theory
Whenever light falls on the transition element compounds electrons absorb energy and excite. When these electrons de-excite they release visible light wavelength. That's why transition element compounds exhibit colour.

Topic: Chemistry, d and f Block Elements, NEET, NEET 2006
In which of the following pairs, both the species are not isostructural?

Options:
A SiCl4,Â PCl4+
B Diamond, silicon carbide
C NH3,Â PH3
D XeF4, XeO4

The correct answer is:
XeF4, XeO4

Solution:
i. Hybridization of NH3 σ=3, lp=1
sp3 geometry : Tetrahedral
ii. Structures of XeF4 is square planar.
Structure of XeO4 is tetrahedral
So XeF4 and XeO4 are not isostructural.
iii. Structure of SiCl4 is tetrahedral.
Structure of PCl4+ is tetrahedral.
iv. Diamond and SiC both are isostructural because both have tetrahedral arrangement and central atom is sp3 hybridized.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2015 (Phase 2)
In which of the following pairs, is the ear represented by the tympanum?

Options:
A Fishes and amphibians
B Amphibians and reptiles
C Reptiles and birds
D Amphibians and mammals

The correct answer is:
Amphibians and reptiles

Solution:
Amphibians and reptiles do not have external ear openings. Rather a tympanum represents the ear in both the classes. Mammals have external pinnae which acts a funnel for the entry of sound which reaches the tympanum inside. Birds also do not posses external ears. They have an external passage hidden under the feathers at the side of the head.

Topic: Biology, Animal Kingdom, NEET
In which of the following pairs of molecules/ions, both the species are not likely to exist?

Options:
A H 2 2 + , He 2
B H 2 - , He 2 2 +
C H 2 + , He 2 2 -
D H 2 - , He 2 2 -

The correct answer is:
H 2 2 + , He 2

Solution:
(i) H 2 2 + â B . O = 0 He 2 â B . O = 2 - 2 2 = 0 }
(ii) H 2 - â B . O = 2 - 1 2 = 0 . 5 He 2 2+ â B . O = 0
(iii) H 2 + = B . O = 1 - 0 2 = 0 . 5 He 2 2 - = B . O = 4 - 2 2 = 1 . 0
(iv) H 2 - â B . O = 2 - 1 2 = 0 . 5 He 2 2 - â B . O = 4 - 2 2 = 1 . 0
As both H22+ and He2 have zero bond order and hence do not exist.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
In which of the following pairs of molecules/ions, the central atoms have $\mathrm{sp}^2$ hybridisation?

Options:
A $\mathrm{NO}_2^{-}$and $\mathrm{NH}_3$
B $\mathrm{BF}_3$ and $\mathrm{NO}_2^{-}$
C $\mathrm{NH}_2^{-}$and $\mathrm{H}_2 \mathrm{O}$
D $\mathrm{BF}_3$ and $\mathrm{NH}_2^{-}$

The correct answer is:
$\mathrm{BF}_3$ and $\mathrm{NO}_2^{-}$

Solution:
Key Idea For $\mathrm{sp}^2$ hybridisation, there must be $3 \sigma$-bonds or $2 \sigma$-bonds along with a lone pair of electrons.
(i) $\mathrm{NO}_2^{-} \Rightarrow 2 \sigma+1 \mathrm{lp}=3$, ie, $\mathrm{sp}^2$ hybridisation
(ii) $\mathrm{NH}_3 \Rightarrow 3 \sigma+1 \mathrm{lp}=4$, ie, $\mathrm{sp}^3$ hybridisation
(iii) $\mathrm{BF}_3 \Rightarrow 3 \sigma+0 \mathrm{lp}=3$, ie, $\mathrm{sp}^2$ hybridisation
(iv) $\mathrm{NH}_2^{-} \Rightarrow 2 \sigma+2 \mathrm{lp}=4$, ie, $\mathrm{sp}^3$ hybridisation
(v) $\mathrm{H}_2 \mathrm{O} \Rightarrow 2 \sigma+2 \mathrm{lp}=4$, ie, $\mathrm{sp}^3$ hybridisation
Thus, among the given pairs, only $\mathrm{BF}_3$ and $\mathrm{NO}_2^{-}$ have $\mathrm{sp}^2$ hybridisation.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2010 (Screening)
In which of the following pairs, the two species are iso-structural?

Options:
A $\mathrm{SO}_3^{2-}$ and $\mathrm{NO}_3^{-}$
B $\mathrm{BF}_3$ and $\mathrm{NF}_3$
C $\mathrm{BrO}_3^{-}$and $\mathrm{XeO}_3$
D $\mathrm{SF}_4$ and $\mathrm{XeF}_4$

The correct answer is:
$\mathrm{BrO}_3^{-}$and $\mathrm{XeO}_3$

Solution:
Hybridisation of $\mathrm{Br}$ is $\mathrm{BrO}_3^{-}$
Total valence elctrons $=7+3 \times 6=25$
Charge $=-1$
Total $=25+1=26$ $=\frac{26}{8}=3(\mathrm{Q})+2(\mathrm{R})=5$
hybridization $=d s p^3$
hybridization of $\mathrm{Xe}$ in $\mathrm{XeO}_3$
Total valence electrons $=8+3 \times 6=26=\frac{26}{8}=3(Q)+2(R)=5$
Hybridization $=d s p^3$
The structure $\mathrm{BrO}_3^{-}$and $\mathrm{XeO}_3$ is trigonal pyramidal.
Caution
Molecular structure of $\mathrm{NO}_3^{-}, \mathrm{NH}_3, \mathrm{NF}_3=$ trigonal pyramidal
Molecular structure of $\mathrm{SO}_3^{2-}=$
Trigonal Planar
Molecular structure of $\mathrm{SF}_4=$ Seesaw
Molecular structure of $\mathrm{XeF}_4=$ Square Planar

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2007
In which of the following photolysis of water takes place?

Options:
A PSÂ I
B PS II
C Both PS I and PS II
D Occurs in stroma of chloroplast

The correct answer is:
PS II

Solution:
Photolysis complex is associated with PS II only. It occurs inside lumen of thylakoid during non-cyclic photophosphorylation.

Topic: Biology, Photosynthesis in Higher Plants, NEET
In which of the following, placenta development can not be seen?

Options:
A Human
B Columba
C Horse
D Cattle

The correct answer is:
Columba

Solution:
Columba is pigeon (a bird), but placenta is found in the mammals (human, horse and cattle).

Topic: Biology, Animal Kingdom, NEET
In which of the following plant are invariably autogamous?

Options:
A Commelina
B Viola
C Oxalis
D None of the above

The correct answer is:
None of the above

Solution:
Some plants such as Viola (common pansy), Oxalis and Commelina produce two types of flowers:
(a) Chasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma.
(b) Cleistogamous flowers which do not open at all. In such flowers, the anthers and stigma lie close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. Thus, cleistogamous flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma. Cleistogamous flowers produce assured seed-set even in the absence of pollinators.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
In which of the following plant seed-setting is assured even in the absence of pollinating agent?

Options:
A Salvia
B Fig
C Common pansy
D Zostera

The correct answer is:
Common pansy

Solution:
Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers - chasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma, and cleistogamous flowers which do not open at all. In such flowers, the anthers and stigma lie close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. Thus, cleistogamous flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma. Cleistogamous flowers produce assured seed-set even in the absence of pollinators.
Salvia is pollinated by insects, figs are pollinated by wasps and Zostera is pollinated by water

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
In which of the following plants, both pollen grains and seeds have a wing-shaped structure?

Options:
A Cycas
B Selaginella
C Azolla
D Pinus

The correct answer is:
Pinus

Solution:
At maturity, the pollen grains are released from the male cones and dispersed by air currents. At this time, a pollen grain has two prothallial cell, a generative cell and tube cell. They form yellow clouds in pine forests. A pollen grain has two air sacs or wings for making it light. Part of the upper surface of the ovuliferous scale is peeled off along with the seed to form its wing. A female cone takes 26 months for reaching maturity. It further opens to release winged seeds that are dispersed by air. After falling on suitable soil, each seed gives rise to a new plant.

Topic: Biology, Plant Kingdom, NEET
In which of the following plants is a tricarpellary syncarpous gynoecium found?

Options:
A Onion
B Solanum
C Pea
D Mustard

The correct answer is:
Onion

Solution:
Three carpels which are fused refers to Tricarpellary syncapous gynoecium. It occurs in members of family liliacea. Onion is member of family lilaceae. Solanum and mustard has bicarpellary syncarpous gynoecium and pea has monocarpellary gynoecium.

Topic: Biology, Morphology of Flowering Plants, NEET
In which of the following, plasticity can be seen due to the changing environment?

Options:
A Cotton
B Coriander
C Butter Cup
D Larkspur

The correct answer is:
Butter Cup

Solution:
Plants follow different pathways in response to the environment or phases of life to form different kinds of structures. This ability is called plasticity, e.g., heterophylly in cotton, coriander and larkspur. In such plants, the leaves of the juvenile plant are different in shape from those in mature plants. On the other hand, differences in shapes of leaves produced in air and those produced in water in buttercup also represent the heterophyllous development due to the environment. This phenomenon of heterophylly is an example of plasticity.

Topic: Biology, Plant - Growth and Development, NEET
In which of the following processes colloidal sulphur is formed

Options:
A FeCl2+H2S
B FeCl3+H2S
C H2SO4+H2S2O4
D SO2+Cl2

The correct answer is:
FeCl3+H2S

Solution:
colloidal sulphur is formed by the reaction of Ferric chloride and H2S as follows
2FeCl 3  +  H 2 S→2HCl + S Colloidal form

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
In which of the following processes energy is absorbed?

Options:
A Cl(g)+e-→Cl(g)-
B F(g)-+e-→F(g)2-
C Na(g)++e-→Na(g)
D Mg(g)2++e-→Mg(g)+

The correct answer is:
F(g)-+e-→F(g)2-

Solution:
EA2 process is always endothermic.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K .
C. $2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}$
D. $\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}$
Choose the correct answer from the options given below:

Options:
A A, B and D
B A, C and D
C C and D
D A and C

The correct answer is:
A, C and D

Solution:
When a liquid evaporates to vapour entropy increases
$2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}$
Number of gaseous product molecules increases so entropy increases.
$\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}$
1 mole $\mathrm{Cl}_{2(\mathrm{~g})}$ form $2 \mathrm{~mol} \mathrm{Cl}_{(\mathrm{g})}$. So entropy increases.

Topic: Chemistry, Thermodynamics (C), NEET, NEET 2024
In which of the following processes, heat is neither absorbed nor released by a system?

Options:
A Isothermal
B Adiabatic
C Isobaric
D Isochoric

The correct answer is:
Adiabatic

Solution:
Adiabatic process

Topic: Physics, Thermodynamics, NEET, NEET 2019 (All India)
In which of the following reaction substrate-level phosphorylation occurs during respiration?

Options:
A Citric acid â Î± -ketoglutaric acid
B Malic acid â oxaloacetic acid
C Î± -ketoglutaric acid â Succinyl-CoA
D Succinyl-CoA â Succinic acid

The correct answer is:
Succinyl-CoA → Succinic acid

Solution:
Substrate-level phosphorylation is the direct synthesis of ATP in the reaction mechanism, also known as transphosphorylation. In Kreb's cycle during conversion of succinyl CoA to succinic acid a molecule of GTP is synthesized. In a coupled reaction GTP is converted to GDP with the simultaneous synthesis of ATP from ADP.

Topic: Biology, Respiration in Plants, NEET
In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?

Options:
A HOCl+H2O2→H3O++Cl-+O2
B I2+H2O2+2OH-→2I-+2H2O+O2
C PbS+4H2O2→PbSO4+4H2O
D 2MnO4-+3H2O2→2MnO2+3O2+2H2O+2OH-

The correct answer is:
PbS+4H2O2→PbSO4+4H2O

Solution:
2e-+2H++H2O2â¶2H2O (reduction)
S-2+4H2Oâ¶SO4-2+8H++8e-(oxidation)
Equation. 1Ã4+Equation.2
Final reaction PbS+4H2O2â¶PbSO4+4H2O

Topic: Chemistry, s Block Elements, NEET
In which of the following reactions of glycolysis, a molecule of water is removed from the substrate?

Options:
A Fructose-6-phosphate → Fructose-1, 6-bisphosphate
B 3-phosphate-glyceraldehyde → 1, 3 bisphosphoglyceric acid
C PEP → Pyruvic acid
D 2- phosphoglycerate → PEP

The correct answer is:
2- phosphoglycerate → PEP

Solution:
In glycolysis, a water molecule is removed during the conversion of 2-phosphoglycerate to PEP.

Topic: Biology, Respiration in Plants, NEET
In which of the following reactions product will be an aldehyde?

Options:
A
B
C CH 3 − CH 2 OH → NaOH +  I 2
D

The correct answer is:

Solution:
Here reaction in option B gives aldehyde
All other reactions give Ketone here for e.g.

Topic: Chemistry, Hydrocarbons, NEET
In which of the following reactions, the increase in volume of the container will favour the formation of products?

Options:
A C(s)+H2O(g)⇌CO(g)+H2(g)
B H2(g)+Cl2(g)⇌2HCl(g)
C 4NH3(g)+5O2(g)⇌4NO(g)+6H2O(l)
D 3O2(g)⇌2O3(g)

The correct answer is:
C(s)+H2O(g)⇌CO(g)+H2(g)

Solution:
In the reaction C(s)+H2O(g)⇌CO(g)+H2(g)
Δng>0 , hence the reaction will shift in forward direction by increasing volume (or lowering the pressure).

Topic: Chemistry, Chemical Equilibrium, NEET
In which of the following reactions, the product(s) given is/are not correct?

Options:
A 3 Cu + 8  HNO 3 dil →3 Cu NO 3 2 + 2 NO + 4  H 2 O
B 3 Zn + 8  HNO 3 very dil  →3 Zn NO 3 2  + 2 NO + 4  H 2 O
C 4 Sn + 10  HNO 3 dil →4 Sn NO 3 2   + NH 4 NO 3 + 3  H 2 O
D As + 3  HNO 3 dil → H 3 AsO 3 + 3  NO 2

The correct answer is:
3 Zn + 8  HNO 3 very dil  →3 Zn NO 3 2  + 2 NO + 4  H 2 O

Solution:
With very dilute HNO3, Zn produces NH4NO3

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
In which of the following redox reaction precipitate is not formed?

Options:
A Cr3+(aq)+Na2O2 (Solution) →
B Fe3+(aq)+(NH4)2S→
C Mn2+(aq)+H2O2+NH3(Solution)→
D Fe2+(aq)+Na2O2(Solution)→

The correct answer is:
Cr3+(aq)+Na2O2 (Solution) →

Solution:
Cr3+(aq)+Na2O2Sol.→CrO42-(aq) (Solution) no precipitate
Fe3+(aq)+(NH4)2S→FeS↓
Mn2+(aq)+H2O2+NH3→MnO(OH)2↓ or MnO2↓2H2O
Fe2+(aq)+Na2O2→Fe(OH)3↓

Topic: Chemistry, d and f Block Elements, NEET
In which of the following region, exonuclease will cut the DNA?

Options:
A Within the polynucleotide chain.
B At end of the polynucleotide chain.
C At particular recognition sites on polynucleotide.
D At end of the polypeptide chain.

The correct answer is:
At end of the polynucleotide chain.

Solution:
Restriction enzymes belong to a larger class of enzymes called nucleases. They are of two types: exonucleases and endonucleases. Exonucleases remove nucleotides from the ends of the DNA whereas, endonucleases make cuts at specific positions within the DNA.

Topic: Biology, Biotechnology - Principles and Processes, NEET
In which of the following, replum can be seen?

Options:
A Brassica
B Pisum
C Hibiscus
D Dianthus

The correct answer is:
Brassica

Solution:
Replum is a false septum like structure present in the fruit that separates the two valves of the fruit. It is observed commonly in the group Brassica. Mustard is a classic example to show replum.

Topic: Biology, Morphology of Flowering Plants, NEET