datavorous/entrance-exam-dataset huggingface dataset:
Which of the following process is possible according to the first law of thermodynamics?

Options:
A $\mathrm{W}>0, \mathrm{Q}<0$ and $\mathrm{dU}=0$
B $\mathrm{W}>0, \mathrm{Q}<0$ and $\mathrm{dU}>0$
C $\quad \mathrm{W}>0, \mathrm{Q}<0$ and $\mathrm{dU}<0$
D $\mathrm{W}<0, \mathrm{Q}>0$ and $\mathrm{dU}<0$

The correct answer is:
$\quad \mathrm{W}>0, \mathrm{Q}<0$ and $\mathrm{dU}<0$

Solution:
Correct answer is (c) \(W > 0, Q < 0\) and \(d U < 0\)

Topic: Physics, Thermodynamics, BITSAT, BITSAT 2012
Which of the following property of alkaline earth metal increases with their atomic number?

Options:
A electronegativity
B solubility of their hydroxides in water
C solubility of their sulphate in water
D ionisation energy

The correct answer is:
solubility of their hydroxides in water

Solution:
The lattice energy of the hydroxides of alkaline earth metal decreases more rapidly than their hydration energy leading to more negative value of ΔHsol down the group. More negative is ΔHsol, more is the solubility of compounds. Hence the solubility of hydroxides of alkaline earth metal increases with their atomic number.

Topic: Chemistry, s Block Elements, BITSAT, BITSAT 2018
Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

Options:
A Drift speed
B Resistivity
C Resistance
D Number of free electrons

The correct answer is:
Number of free electrons

Solution:
Only number of free electrons is constant, other factors are temperature dependent.

Topic: Physics, Current Electricity, BITSAT, BITSAT 2010
Which of the following reactants is used for the preparation of ethyl benzene, where anhy. AlCl3 is a catalyst?

Options:
A CH3·CH2·OH+C6H6
B CH3-CH=CH2+C6H6
C H2C=CH2+C6H6
D CH3-CH3+C6H6

The correct answer is:
H2C=CH2+C6H6

Solution:
Fridel crafts Alkylation of Benzene takes place when ALkyl halide reacted with Benzene in presence of Anhydrous AlCl3â.

Now Alkenes can form Alkyl Benzene in Industrial process. The process involves the reaction of Benzene and Ethylene in presence of an Anhydrous AlCl3catalyst promoted by HCl.

The H2C=CH2+C6H6 on reaction produce ethyl benzene as follows

Topic: Chemistry, Alcohols Phenols and Ethers, BITSAT, BITSAT 2019
Which of the following reactions does not involve absorption of energy?

I. Og+e-⟶O-g

II. Sg+e-⟶S-g

III. O-g+e-⟶O2-g

IV. Clg+e-⟶Cl-g

Options:
A Only II
B I and III
C I, II and III
D I, II and IV

The correct answer is:
I, II and IV

Solution:
Reaction (I),(II) and (IV) are of exothermic nature, thus do not involve absorption energy.

The process O-g+e-⟶O2-gâ involves absorption of energy.

When a neutral atom gains an electron, energy is released. When an anion (having unit negative charge) gains an electron, energy is absorbed. This is due to the repulsion between the additional electron and negatively charged anion.

Topic: Chemistry, Thermodynamics (C), BITSAT, BITSAT 2017
Which of the following reactions increases the production of dihydrogen from synthesis gas?

Options:
A CH4g+H2Og→Ni1270 KCOg+3H2g
B Cs+H2Og⟶1270 KCOg+H2g
C COg+H2Og→Catalyst 673 KCO2g+H2g
D C2H6+2H2O→Ni1270 K2CO+5H2,

The correct answer is:
COg+H2Og→Catalyst 673 KCO2g+H2g

Solution:
The process of producing syn gas or synthesis gas from coal is called 'coal gasification'.

CsCoal+H2OgSteam→Ni1270 KCOg+H2g⏟Synthesisgas

The production of hydrogen can be increased by reacting carbon monoxide of the syn gas with steam in the presence of iron chromate as a catalyst at 673 K.

COg+H2Og⟶FeCrO4, 673 KCO2g+H2g

CO2 is removed by scrubbing with a solution of sodium arsenite.

Topic: Chemistry, Hydrogen, BITSAT, BITSAT 2018
Which of the following reactions is an example of calcination process?

Options:
A 2Ag+2HCl+O⟶2AgCl+H2O
B 2Zn+O2⟶2ZnO
C 2ZnS+3O2⟶2ZnO+2SO2
D MgCO3⟶ΔMgO+CO2

The correct answer is:
MgCO3⟶ΔMgO+CO2

Solution:
The process of conversion of a concentrated ore into its oxide by heating in absence of or in limited supply of air is called calcination. It is usually done for hydroxide, hydrated oxides and carbonate ores.

MgCO3⟶ΔMgO+CO2g

Topic: Chemistry, General Principles and Processes of Isolation of Metals, BITSAT, BITSAT 2017
Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

Options:
A CH4g+H2Og→Ni1270 KCOg+H2g
B COg+H2Og→Catalyst673 KCO2g+H2g
C CnH2n+2+n.H2Og→Ni1270 Kn.CO+2n+1H2
D COg+2H2g→CatalystCobaltCH3·OHI

The correct answer is:
COg+2H2g→CatalystCobaltCH3·OHI

Solution:
The mixture of COg and H2g is known water gas as it is used in the synthesis of other compounds.

When carbon monoxide reacts with hydrogen in presence of catalyst cobalt the product formed is methanol. Therefore, water gas is producing a an alcohol in this reaction.

Topic: Chemistry, Hydrogen, BITSAT, BITSAT 2019
Which of the following reactions will not give $\mathrm{N}, \mathrm{N}$ -dimethyl benzamide?

Options:
A
B
C
D

The correct answer is:

Solution:
(a) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOC}_{2} \mathrm{H}_{5}+\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} \rightarrow$

$\mathrm{C}_{6} \mathrm{H}_{5}\mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$

(b) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CONH}_{2}+\mathrm{CH}_{3} \mathrm{MgI}$

$\rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CONH} \mathrm{MgI}+\mathrm{CH}_{4}$

(c) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}+\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} \rightarrow$

$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}+\mathrm{HCl}$

(d) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CO} . \mathrm{O} . \mathrm{COC}_{6} \mathrm{H}_{5}+$

$\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}$

$+\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}$

Topic: Chemistry, Carboxylic Acid Derivatives, JEE Main
Which of the following reactions will not give $\mathrm{N}, \mathrm{N}$ -dimethyl benzamide?

Options:
A
B
C
D

The correct answer is:

Solution:
(a) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOC}_{2} \mathrm{H}_{5}+\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} \rightarrow$

$\mathrm{C}_{6} \mathrm{H}_{5}\mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$

(b) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CONH}_{2}+\mathrm{CH}_{3} \mathrm{MgI}$

$\rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CONH} \mathrm{MgI}+\mathrm{CH}_{4}$

(c) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}+\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} \rightarrow$

$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}+\mathrm{HCl}$

(d) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CO} . \mathrm{O} . \mathrm{COC}_{6} \mathrm{H}_{5}+$

$\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CON}\left(\mathrm{CH}_{3}\right)_{2}$

$+\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}$

Topic: Chemistry, Carboxylic Acid Derivatives, BITSAT, BITSAT 2020
Which of the following represents hexadentate ligand?

Options:
A EDTA
B DMG
C Ethylenediamine
D None of the above

The correct answer is:
EDTA

Solution:
EDTA is hexadentate ligand

Topic: Chemistry, Coordination Compounds, BITSAT, BITSAT 2015
Which of the following represents the correct order of $\mathrm{Cl}-\mathrm{O}$ bond lengths in

$\mathrm{ClO}^{-}, \mathrm{ClO}_{2}^{-}, \mathrm{ClO}_{3}^{-}, \mathrm{ClO}_{4}^{-} \text {? }$

Options:
A $\mathrm{ClO}_{4}^{-}=\mathrm{ClO}_{3}^{-}=\mathrm{ClO}_{2}^{-}=\mathrm{ClO}^{-}$
B $\mathrm{ClO}^{-} < \mathrm{ClO}_{2}^{-} < \mathrm{ClO}_{3}^{-} < \mathrm{ClO}_{4}^{-}$
C $\mathrm{ClO}_{4}^{-} < \mathrm{ClO}_{3}^{-} < \mathrm{ClO}_{2}^{-} < \mathrm{ClO}^{-}$
D $\mathrm{ClO}_{3}^{-} < \mathrm{ClO}_{4}^{-} < \mathrm{ClO}_{2}^{-} < \mathrm{ClO}^{-}$

The correct answer is:
$\mathrm{ClO}_{4}^{-} < \mathrm{ClO}_{3}^{-} < \mathrm{ClO}_{2}^{-} < \mathrm{ClO}^{-}$

Solution:
The b.o in $\mathrm{Cl}-\mathrm{O}^{-}$is 1

The b.o in $\mathrm{O}=\mathrm{Cl}-\mathrm{O}^{-}$is $1.5$

The b.o. in $\mathrm{O}=\mathrm{Cl}=\mathrm{O}$ is $\frac{5}{3}=1.66$

The b.o. in $\mathrm{O}=\underset{\mathrm{O}}{\stackrel{\mathrm{O}}{\|}} \mathrm{l}-\mathrm{O}^{-}$is $\frac{7}{4}=1.75$

The bond length increases as b.o. decreases.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2021
Which of the following salt would give SO2 with hot and dil H2SO4 and also decolourises Br2 water?

Options:
A Na2SO3
B NaHSO4
C Na2SO4
D Na2 S

The correct answer is:
Na2SO3

Solution:
When Na2SO3 reacts with hot and dil H2SO4, it gives SO2g which decolourises bromine-water.

The reaction proceed as follows:

(i) Na2SO3+H2SO4⟶Na2SO4+SO2+H2O

(ii) Br2+H2O⟶2HBr+O

(iii) SO2+O⟶SO3 (decolourisation of bromine-water)

Topic: Chemistry, s Block Elements, BITSAT, BITSAT 2019
Which of the following set contains species having same angle around the central atom?

Options:
A $\mathrm{SF}_{4}, \mathrm{CH}_{4}, \mathrm{NH}_{3}$
B $\mathrm{NF}_{3}, \mathrm{BCl}_{3}, \mathrm{NH}_{3}$
C $\mathrm{BF}_{3}, \mathrm{NF}_{3}, \mathrm{AlCl}_{3}$
D $\mathrm{BF}_{3}, \mathrm{BCl}_{3}, \mathrm{BBr}_{3}$

The correct answer is:
$\mathrm{BF}_{3}, \mathrm{BCl}_{3}, \mathrm{BBr}_{3}$

Solution:
$\mathrm{BF}_{3}, \mathrm{BCl}_{3}, \mathrm{BBr}_{3}$ are $s p^{2}$ hybridised. So, all have same structure and bond angle i.e. $120^{\circ}$.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2021
Which of the following show an increase in entropy?

I. Boiling of water

II. Melting of ice

III. Freezing of water

IV. Formation of hydrogen gas from water

Options:
A (I) and (II)
B Only (III)
C (I), (II) and (IV)
D (III) and (IV)

The correct answer is:
(I), (II) and (IV)

Solution:
Entropy is the measure of disorderliness. It means as disorderliness increases entropy increases.

Melting of ice leads to the formation of liquid water where the particles are in random motion which leads to an increase in entropy.

Option (c) is the correct option as in (i),(ii) and (iv) the state changes towards more random state, thus entropy increases.

Topic: Chemistry, Thermodynamics (C), BITSAT, BITSAT 2017
Which of the following show maximum bond-order?

Options:
A O2
B O2-
C O2+
D O22-

The correct answer is:
O2+

Solution:
∵ Bond order BO=Nb-Na2

Here, Nb and Na are the number of bonding and anti bonding electrons, respectively.

for O2,BO=10-62=2

for O2-,BO=10-72=1.5

for O2+,BO=10-52=2.5

for O22-,BO=10-82=1

Hence, maximum value for BO is for O2+.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2017
Which of the following shows maximum magnetic moment?

Options:
A Mg2+
B Ti3+
C V3+
D Fe2+

The correct answer is:
Fe2+

Solution:
More be the number of unpaired electrons → more be the magnetic moment.

and

Number of unpaired electrons in Mg2+=0

Number of unpaired electrons in Ti3+=1

Number of unpaired electrons in V3+=2

Fe2+=4

Number of unpaired electrons in

Thus, Fe2+ show maximum value of magnetic moment (μ).

also, μ=n(n+2). BM (n= Number of unpaired electrons).

Topic: Chemistry, Coordination Compounds, BITSAT, BITSAT 2017
Which of the following solutions of $\mathrm{KCl}$ will have the highest value of specific conductance?

Options:
A $1.0 \mathrm{~N}$
B $0.1 \mathrm{~N}$
C $1.0 \times 10^{-2} \mathrm{~N}$
D $1.0 \times 10^{-3} \mathrm{~N}$

The correct answer is:
$1.0 \mathrm{~N}$

Solution:
The specific conductance increases with concentration. The number of ions per $\mathrm{cm}^3$ increase with increase of concentration.

Topic: Chemistry, Electrochemistry, BITSAT, BITSAT 2023 (Memory Based Paper 2)
Which of the following statement is a tautology?

Options:
A p∨q∨~p
B ~q∧p∨p∨~p
C Both (a) and (b)
D None of the above

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

Solution:
Truth table

p	q	~p	~q	p∨q	~q∧p	p∨~p	p∨q∨~p	~q∧p∨p∨~p

T	T	F	F	T	F	T	T	T

T	F	F	T	T	T	T	T	T

F	T	T	F	T	F	T	T	T

F	F	T	T	F	F	T	T	T

Hence, option (c) is correct.

Topic: Mathematics, Mathematical Reasoning, BITSAT, BITSAT 2018
Which of the following statement is incorrect regarding the equation
MeCHO+AgNH32++O¯H⟶MeCOO-+Ag

Options:
A The equivalent weight of MeCHO is 22 .
B Three moles of O¯H are required in the reaction.
C MeCHO acts as an oxidising agent.
D AgNH32+ gets reduced.

The correct answer is:
MeCHO acts as an oxidising agent.

Solution:
Oxidation :
CH3COO-+3O¯H→CH3COO-+2e-+2H2O

Reduction : AgNH32++e-⟶Ag+NH3×2

CH3CHO+2AgNH32++3O¯H⟶CH3OO¯+2H2O

Molecular mass M of CH3CHO=44 g mol-1

Equivalent weight Eω=Mn-factor=442=22 g mol-1

Since aldehyde is getting oxidised therefore, it is acting as reducing agent and not oxidising agent.

Topic: Chemistry, Redox Reactions, BITSAT, BITSAT 2018
Which of the following statements about vitamin B-12 is incorrect?

Options:
A It has a cobalt atom.
B It also occurs in plants.
C It is also present in rain water.
D It is needed for human body in very small amounts.

The correct answer is:
It also occurs in plants.

Solution:
Vitamin $\mathrm{B}_{12}$ does not occur in plants.

Topic: Chemistry, Biomolecules, BITSAT, BITSAT 2009
Which of the following statements is/are true?
1.$\mathrm{PH}_{5}$ and $\mathrm{BiCl}_{5}$ do not exist.
2.$p \pi-d \pi$ bond is present in $\mathrm{SO}_{2}$
3.$\mathrm{I}_{3}^{+}$ has bent geometry.
4.$\mathrm{SeF}_{4}$ and $\mathrm{CH}_{4}$, have same shape.

Options:
A 1,2,3
B 1,3
C 1,3,4
D 1,2,4

The correct answer is:
1,2,3

Solution:
All the three statements are correct.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2010
Which of the following two are isostructural?

Options:
A $\mathrm{XeF}_{2,} \mathrm{IF}_{2}^{-}$
B $\mathrm{NH}_{3}, \mathrm{BF}_{3}$
C $\mathrm{CO}_{3}^{2-}, \mathrm{SO}_{3}^{2-}$
D $\mathrm{PCI}_{5}, \mathrm{ICI}_{5}$

The correct answer is:
$\mathrm{XeF}_{2,} \mathrm{IF}_{2}^{-}$

Solution:
$\mathrm{XeF}_{2}$ and $\mathrm{IF}_{2}^{-}$ both are linear and have hybridisation $s p^{3} d$.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2009
Which of the following will be the most effective in the coagulation of $\mathrm{Fe}(\mathrm{OH})_{3}$ soil?

Options:
A $\mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2}$
B $\mathrm{BaCl}_{2}$
C $\mathrm{NaCl}$
D $\mathrm{KCN}$

The correct answer is:
$\mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

Solution:
According to Hardy-Schulze rule, coagulation power of ions is directly proportional to charge on ion. $\because \mathrm{Fe}(\mathrm{OH})_{3}$ is positively charged colloid. $\therefore$ It will be coagulated by anion.
(a) $\mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2} \rightleftharpoons 3 \mathrm{Mg}^{2+}+2 \mathrm{PO}_{4}^{3-}$
(b) $\mathrm{BaCl}_{2} \rightleftharpoons \mathrm{Ba}^{2+}+2 \mathrm{Cl}^{-}$
(c) $\mathrm{NaCl} \rightleftharpoons \mathrm{Na}^{+}+\mathrm{Cl}^{-}$
(d) $\mathrm{KCN} \rightleftharpoons \mathrm{K}^{+}+\mathrm{CN}^{-}$
Because $\mathrm{PO}_{4}^{3-}$ has highest charge among the given anions, therefore, $\mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2}$ is the most effective in the coagulation of $\mathrm{Fe}(\mathrm{OH})_{3}$ solution.

Topic: Chemistry, Surface Chemistry, BITSAT, BITSAT 2012
Which of the following will form the cathode with respect to iron anode in an electrolyte cell?

Options:
A $\mathrm{Mg}$
B $\mathrm{Al}$
C $\mathrm{Cu}$
D $\mathrm{Zn}$

The correct answer is:
$\mathrm{Mg}$

Solution:
In electrolytic cell the cathode is of higher reduction potential.

Topic: Chemistry, Solutions, BITSAT, BITSAT 2010
Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

Options:
A $\mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$
B $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$
C $\mathrm{CH}_{3} \mathrm{OH}$
D $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$

The correct answer is:
$\mathrm{CH}_{3} \mathrm{OH}$

Solution:
$\mathrm{CH}_{3} \mathrm{OH}$ does not have $-\mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$ group
hence it will not form yellow precipitate with an alkaline solution of iodine (haloform reaction).

Topic: Chemistry, Aldehydes and Ketones, BITSAT, BITSAT 2010
Which of the following will precipitate first when aqueous solution containing sulphate ions are added?

Options:
A $\mathrm{Mg}^{2+}$
B $\mathrm{Ca}^{2+}$
C $\mathrm{Sr}^{2+}$
D $\mathrm{Ba}^{2+}$

The correct answer is:
$\mathrm{Ba}^{2+}$

Solution:
Down the group solubility of sulphate decreases. Thus, $\mathrm{Ba}^{2+}$ ions will precipitate out most easily.

Topic: Chemistry, s Block Elements, BITSAT, BITSAT 2023 (Memory Based Paper 1)
Which of the followings forms the base of talcum powder?

Options:
A Zine stearate
B Sodium aluminium silicate
C Magnesium hydrosilicate
D Chalk

The correct answer is:
Magnesium hydrosilicate

Solution:
Magnesium hydrosilicate forms base of Talcum powder.

Topic: Chemistry, s Block Elements, BITSAT, BITSAT 2016
Which of these is least likely to act as Lewis base?

Options:
A $\mathrm{F}^{-}$
B $\mathrm{BF}_{3}$
C $\mathrm{PF}_{3}$
D $\mathrm{CO}$

The correct answer is:
$\mathrm{BF}_{3}$

Solution:
$\mathrm{BF}_{3}$ is Lewis acid (e- pair acceptor)

Topic: Chemistry, Ionic Equilibrium, BITSAT, BITSAT 2010
Which one is correct about fission?

Options:
A Approx. $0.1 \%$ mass converts into energy.
B Most of energy of fission is in the form of heat.
C In a fission of $U^{235}$ about 200 eV energy is released.
D On an average, one neutron is released per fission of $\mathrm{U}^{235}$

The correct answer is:
Approx. $0.1 \%$ mass converts into energy.

Solution:
No Solution available

Topic: Physics, Nuclear Physics, BITSAT, BITSAT 2011
Which one of given elements shows maximum number of different oxidation states in its compounds?

Options:
A $\mathrm{Am}$
B $\mathrm{Fm}$
C $\mathrm{La}$
D Gd

The correct answer is:
$\mathrm{Am}$

Solution:
Am shows maximum number of oxidation

$$

\text { states, }+3,+4,+5,+6

$$

Topic: Chemistry, d and f Block Elements, BITSAT, BITSAT 2015
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

Options:
A $\quad \mathrm{S}<\mathrm{O}<\mathrm{Cl}<\mathrm{F}$
B $\quad \mathrm{Cl}<\mathrm{F}<\mathrm{S}<\mathrm{O}$
C $\quad \mathrm{F}<\mathrm{Cl}<\mathrm{O}<\mathrm{S}$
D $\quad \mathrm{O}<\mathrm{S}<\mathrm{F}<\mathrm{Cl}$

The correct answer is:
$\quad \mathrm{O}<\mathrm{S}<\mathrm{F}<\mathrm{Cl}$

Solution:
The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron gain enthalpy.

Electron affinity value generally increase on moving from left to right in a period however there are exceptions of this rule in the case of those atoms which have stable configuration. These atoms resist the addition of extra electron, therefore the low value of electron affinity $\underset{-1.48}{\mathrm{O}}<\underset{-2.0}{\mathrm{~S}}<\underset{-3.6}{\mathrm{~F}}<\underset{-3.8}{\mathrm{Cl}}$

On the other hand $\mathrm{Cl}$, because of its comparatively bigger size than $\mathrm{F}$, allow the addition of an extra electron more easily.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, BITSAT, BITSAT 2014
Which one of the following contain isopropyl group?

Options:
A 2,2,3,3 -Tetramethylpentane
B 2 -Methylpentane
C 2,2,3 -Trimethylpentane
D 3,3 -Dimethylpentane

The correct answer is:
2 -Methylpentane

Solution:

Topic: Chemistry, General Organic Chemistry, JEE Main
Which one of the following contain isopropyl group?

Options:
A 2,2,3,3 -Tetramethylpentane
B 2 -Methylpentane
C 2,2,3 -Trimethylpentane
D 3,3 -Dimethylpentane

The correct answer is:
2 -Methylpentane

Solution:

Topic: Chemistry, General Organic Chemistry, BITSAT, BITSAT 2009
Which one of the following coordination compounds is used to inhibit the growth of tumours?

Options:
A Trans-platin
B EDTA complex of calcium
C $\left[\left(\mathrm{Ph}_{3} \mathrm{P}\right)_{3} \mathrm{RhCl}\right]$
D Cis - platin

The correct answer is:
Cis - platin

Solution:
Cisplatin $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$ is used in cancer treatment.

Topic: Chemistry, Coordination Compounds, BITSAT, BITSAT 2021
Which one of the following curves represents the variation of impedance ( $Z$ ) with frequency $f$ in series LCR circuit?

Options:
A
B
C
D

The correct answer is:

Solution:
$Z=\sqrt{R^{2}+\left(2 \pi \mathrm{fL}-\frac{1}{2 \pi \mathrm{fC}}\right)^{2}}$

Topic: Physics, Alternating Current, JEE Main
Which one of the following curves represents the variation of impedance ( $Z$ ) with frequency $f$ in series LCR circuit?

Options:
A
B
C
D

The correct answer is:

Solution:
$Z=\sqrt{R^{2}+\left(2 \pi \mathrm{fL}-\frac{1}{2 \pi \mathrm{fC}}\right)^{2}}$

Topic: Physics, Alternating Current, BITSAT, BITSAT 2011
Which one of the following does not follow octate rule?

Options:
A $\mathrm{PF}_{3}$
B $\mathrm{BF}_{3}$
C $\mathrm{CO}_{2}$
D $\mathrm{CCl}_{4}$

The correct answer is:
$\mathrm{BF}_{3}$

Solution:
$\mathrm{BF}_{3}$ does not follow octate rule because central atom, boron lacks an electron pair. Thus, it also acts as Lewis acid.

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main
Which one of the following does not follow octate rule?

Options:
A $\mathrm{PF}_{3}$
B $\mathrm{BF}_{3}$
C $\mathrm{CO}_{2}$
D $\mathrm{CCl}_{4}$

The correct answer is:
$\mathrm{BF}_{3}$

Solution:
$\mathrm{BF}_{3}$ does not follow octate rule because central atom, boron lacks an electron pair. Thus, it also acts as Lewis acid.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2015
Which one of the following exhibits geometrical isomerism?

Options:
A
1,2-Dibromopropene
B
2, 3-Dimethylbut-2-ene
C
2, 3-Dibromobut-2-ene
D
Both (a) and (c)

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

Solution:
Alkenes having double bonds with two different groups on each end of the double bond show geometrical isomerism. $A_2 b_2 c_2, A_2 b_2 c d$, $A_2$ bcde.

Topic: Chemistry, General Organic Chemistry, BITSAT, BITSAT 2023 (Memory Based Paper 2)
Which one of the following graphs represents the variation of electric potential with distance $r$ from the centre of a non-conducting charged sphere of radius $R$ ?

Options:
A

B

C

D

The correct answer is:

Solution:
Electric potential at centre $R=0$
$$
V_{\text {centre }}=1.5 V_{\text {surface }}
$$

where,
$$
\begin{aligned}
V_0 & =\frac{k Q}{R} \\
V_{\text {inside }} & =\frac{k Q}{2 R}\left(3-\frac{r^2}{R^2}\right)
\end{aligned}
$$

Topic: Physics, Electrostatics, BITSAT, BITSAT 2022
Which one of the following ions has the highest value of ionic radius?

Options:
A $\mathrm{O}^{2-}$
B $\mathrm{B}^{3+}$
C $\mathrm{Li}^{+}$
D $\mathrm{F}^{-}$

The correct answer is:
$\mathrm{O}^{2-}$

Solution:
The ionic radii follows the order $\mathrm{O}^{2-}>\mathrm{F}^{-}>\mathrm{Li}^{+}>\mathrm{B}^{3+}$

Topic: Chemistry, Classification of Elements and Periodicity in Properties, BITSAT, BITSAT 2009
Which one of the following ions has the maximum magnetic moment?

Options:
A $\mathrm{Sc}^{3+}$
B $\mathrm{Ti}^{3+}$
C $\mathrm{Cr}^{3+}$
D $\mathrm{Fe}^{3+}$

The correct answer is:
$\mathrm{Fe}^{3+}$

Solution:
$\mathrm{Fe}^{3+}\left(d^{5}\right)$ has 5 unpaired electrons therefore magneticmoment $=\sqrt{n(n+2)}=\sqrt{5(5+2)}=5.91$ which is maximum among given options. As $\mathrm{Sc}^{3+}, \mathrm{Ti}^{3+}, \mathrm{Cr}^{3+}$ and $\mathrm{V}^{3+}$ contain $0,1,3$, and 2 number of unpaired electrons respectively.

Topic: Chemistry, Chemical Bonding and Molecular Structure, BITSAT, BITSAT 2021