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NEET

Explore popular questions for NEET. This collection includes questions from Chemistry, Physics, Biology. They're hand picked by top teachers from a vast pool of questions including previous year NEET questions.

Q 1.

Correct4

Incorrect-1

The equilibrium constants of the following are
{tex} \begin{array} { l l } { \mathrm { N } _ { 2 } + 3 \mathrm { H } _ { 2 } \rightleftharpoons 2 \mathrm { NH } _ { 3 } }; & { K _ { 1 } } \\ { \mathrm { N } _ { 2 } + \mathrm { O } _ { 2 } \rightleftharpoons 2 \mathrm { NO } ; } & { K _ { 2 } } \\ { \mathrm { H } _ { 2 } + \frac { 1 } { 2 } \mathrm { O } _ { 2 } \rightleftharpoons \mathrm { H } _ { 2 } \mathrm { O } ; } & { K _ { 3 } } \end{array} {/tex}
The equilibrium constant {tex} ( K ) {/tex} of the reaction
{tex} 2 \mathrm { NH } _ { 3 } + \frac { 5 } { 2 } \mathrm { O } _ { 2 } \stackrel { \mathrm { K } } { \rightleftharpoons } 2 \mathrm { NO } + 3 \mathrm { H } _ { 2 } \mathrm { O } {/tex} will be

{tex} K _ { 2 } K _ { 3 } ^ { 3 } / K _ { 1 } {/tex}

B

{tex} K _ { 2 } K _ { 3 } / K _ { 1 } {/tex}

C

{tex} K _ { 2 } ^ { 3 } K _ { 3 } / K _ { 1 } {/tex}

D

{tex} K _ { 1 } K _ { 3 } ^ { 3 } / K _ { 2 } {/tex}

Explanation



Q 2.

Correct4

Incorrect-1

Concentration of the {tex} \mathrm { Ag } ^ { + } {/tex} ions in a saturated solution of {tex} \mathrm { Ag } _ { 2 } \mathrm { C } _ { 2 } \mathrm { O } _ { 4 } {/tex} is {tex} 2.2 \times 10 ^ { - 4 } \mathrm { mol } \ \mathrm { L } ^ { - 1 } {/tex} . Solubility product of {tex} \mathrm { Ag } _ { 2 } \mathrm { C } _ { 2 } \mathrm { O } _ { 4 } {/tex} is

A

{tex} 2.66 \times 10 ^ { - 12 } {/tex}

B

{tex} 4.5 \times 10 ^ { - 11 } {/tex}

{tex} 5.3 \times 10 ^ { - 12 } {/tex}

D

{tex} 2.42 \times 10 ^ { - 8 } {/tex}

Explanation

Q 3.

Correct4

Incorrect-1

A 20 litre container at 400{tex}\ \mathrm { K } {/tex} contains {tex} \mathrm { CO } _ { 2 ( \mathrm { g } ) } {/tex} at pressure 0.4{tex}\ \mathrm { atm } {/tex} and an excess of {tex}\mathrm {SrO}{/tex} (neglect the volume of solid {tex}\mathrm {SrO}{/tex}). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of {tex} \mathrm { CO } _ { 2 } {/tex} attains its maximum value, will be
(Given that : {tex} \operatorname { SrCO } _ { 3 ( s ) } \rightleftharpoons \mathrm { SrO } _ { ( s ) } + \mathrm { CO } _ { 2 ( g ) }, {/tex} {tex} K _ { p } = 1.6\ \mathrm { atm } {/tex} )

A

10 litre

B

4 litre

C

2 litre

5 litre

Explanation



Q 4.

Correct4

Incorrect-1

The percentage of pyridine {tex}\mathrm {(C_{5}H_{5}N)}{/tex} that forms pyridinium ion {tex}\mathrm{(C_{5}H_{5}N^{+}H)}{/tex} in a {tex}\mathrm{0.10\ M}{/tex} aqueous pyridine solution({tex}K_{b}{/tex} for {tex}\mathrm{C_{5}H_{5}N = 1.7 \times 10^{-9}}{/tex}) is

A

0.0060{tex} \% {/tex}

0.013{tex} \% {/tex}

C

0.77{tex} \% {/tex}

D

1.6{tex} \% {/tex}

Explanation

Q 5.

Correct4

Incorrect-1

The solubility of {tex} \mathrm { AgCl } _ { ( s ) } {/tex} with solubility product {tex} 1.6 \times 10 ^ { - 10 } {/tex} in 0.1{tex}\ \mathrm { M } {/tex} NaCl solution would be

A

{tex} 1.26 \times 10 ^ { - 5 } \mathrm { M } {/tex}

{tex} 1.6 \times 10 ^ { - 9 } \mathrm { M } {/tex}

C

{tex} 1.6 \times 10 ^ { - 11 } \mathrm { M } {/tex}

D

zero

Explanation



Q 6.

Correct4

Incorrect-1

Which of the following fluoro-compounds is most likely to behave as a Lewis base?

A

{tex} \mathrm { BF } _ { 3 } {/tex}

{tex} \mathrm { PF } _ { 3 } {/tex}

C

{tex} \mathrm { CF } _ { 4 } {/tex}

D

{tex} \mathrm { SiF } _ { 4 } {/tex}

Explanation

Q 7.

Correct4

Incorrect-1

{tex} M Y {/tex} and {tex} N Y _ { 3 } , {/tex} two nearly insoluble salts, have the same {tex} K _ { \mathrm { sp } } {/tex} values of {tex} 6.2 \times 10 ^ { - 13 } {/tex} at room temperature. Which statement would be true in regard to {tex} M Y {/tex} and {tex} N Y _ { 3 } ? {/tex}

A

The salts {tex} M Y {/tex} and {tex} N Y _ { 3 } {/tex} are more soluble in {tex} \mathrm {0.5\ { M }}\ KY{/tex} than in pure water.

B

The addition of the salt of {tex} K Y {/tex} to solution of {tex} M Y {/tex} and {tex} N Y _ { 3 } {/tex} will have no effect on their solubilities.

C

The molar solubilities of {tex} M Y {/tex} and {tex} N Y _ { 3 } {/tex} in water are identical.

The molar solubility of {tex} M Y {/tex} in water is less than that of {tex} N Y _ { 3 } {/tex} .

Explanation

Q 8.

Correct4

Incorrect-1

If the equilibrium constant for
{tex} N_{2(g)} + O_{2(g)}\rightleftharpoons 2NO_{(g)}{/tex} is {tex} K {/tex}, the equilibrium constant for {tex}\frac{1}{2} N_{2(g)} + \frac{1}{2} O_{2(g)}\rightleftharpoons NO_{(g)}{/tex} will be

A

{tex} \frac { 1 } { 2 } K {/tex}

B

{tex} K {/tex}

C

{tex} K ^ { 2 } {/tex}

{tex} K ^ { 1 / 2 } {/tex}

Explanation

Q 9.

Correct4

Incorrect-1

What is the pH of the resulting solution when equal volumes of {tex} \mathrm {0.1 \ M\ NaOH } {/tex} and {tex} 0.01\ \mathrm { M\ HCl } {/tex} are mixed?

A

2.0

B

7.0

C

1.04

12.65

Explanation



Q 10.

Correct4

Incorrect-1

Aqueous solution of which of the following compounds is the best conductor of electric current?

Hydrochloric acid, {tex}\mathrm {HCl}{/tex}

B

Ammonia,{tex}\mathrm {NH_{3}}{/tex}

C

Fructose, {tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 12 } \mathrm { O } _ { 6 } {/tex}

D

Acetic acid, {tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 4 } \mathrm { O } _ { 2 } {/tex}

Explanation

Q 11.

Correct4

Incorrect-1

Which one of the following pairs of solution is not an acidic buffer?

A

{tex} \mathrm { CH } _ { 3 } \mathrm { COOH } {/tex} and {tex} \mathrm { CH } _ { 3 } \mathrm { COONa } {/tex}

B

{tex} \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } {/tex} and {tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

C

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } {/tex} and {tex} \mathrm { Na } _ { 3 } \mathrm { PO } _ { 4 } {/tex}

{tex} \mathrm { HClO } _ { 4 } {/tex} and {tex} \mathrm { NaClO } _ { 4 } {/tex}

Explanation

Q 12.

Correct4

Incorrect-1

The {tex}K_{sp}{/tex} of {tex}\mathrm {Ag_{2}CrO_{4}, AgCl, AgBr} {/tex} and {tex}\mathrm {AgI} {/tex} are respectively {tex} 1.1\times 10^{-12}, 1.8 \times 10^{-10}, 5.0 \times 10^{-13}, 8.3 \times 10^{-17}{/tex}. Which one of the following salts will precipitate last if {tex}\mathrm{AgN0_{3}}{/tex} solution is added to the solution containing equal moles of {tex}\mathrm{NaCl, NaBr, NaI}{/tex} and {tex}\mathrm{Na_{2}CrO_{4}}?{/tex}

A

{tex} \mathrm { AgBr } {/tex}

{tex} \mathrm { Ag } _ { 2 } \mathrm { CrO } _ { 4 } {/tex}

C

{tex} \mathrm { AgI } {/tex}

D

{tex} \mathrm { AgCl } {/tex}

Explanation

Q 13.

Correct4

Incorrect-1

Which of the following statements is correct for a reversible process in a state of equilibrium?

{tex} \Delta G ^ { \circ } = - 2.30\ RT \log K {/tex}

B

{tex} \Delta G ^ { \circ } = 2.30\ RT \log K {/tex}

C

{tex} \Delta G = - 2.30\ RT \log K {/tex}

D

{tex} \Delta G = 2.30\ RT \log K {/tex}

Q 14.

Correct4

Incorrect-1

If the value of equilibrium constant for a particular reaction is {tex} 1.6 \times 10 ^ { 12 } {/tex}, then at equilibrium the system will contain

mostly products

B

similar amounts of reactants and products

C

all reactants

D

mostly reactants.

Explanation


Q 15.

Correct4

Incorrect-1

Which of the following salts will give highest pH in water?

A

{tex} \mathrm { KCl } {/tex}

B

{tex} \mathrm { NaCl } {/tex}

{tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

D

{tex} \mathrm { CuSO } _ { 4 } {/tex}

Explanation

Q 16.

Correct4

Incorrect-1

Using the Gibb's energy change, {tex} \Delta G ^ { \circ } = + 63.3 \mathrm { kJ } , {/tex} for the following reaction,
{tex} \quad \mathrm { Ag } _ { 2 } \mathrm { CO } _ { 3 ( \mathrm { s } ) } \rightleftharpoons 2 \mathrm { Ag } ^ { + }(aq) + \mathrm { CO } _ { 3 } ^ { 2 - }(aq){/tex}
the {tex} K _ { \mathrm { sp } } {/tex} of {tex} \mathrm { Ag } _ { 2 } \mathrm { CO } _ { 3 ( s ) } {/tex} in water at {tex} 25 ^ { \circ } \mathrm { C } {/tex} is {tex} \left( R = 8.314\ \mathrm { J\ K } ^ { - 1 } \mathrm {\ mol } ^ { - 1 } \right) {/tex}

A

{tex} 3.2 \times 10 ^ { - 26 } {/tex}

{tex} 8.0 \times 10 ^ { - 12 } {/tex}

C

{tex} 2.9 \times 10 ^ { - 3 } {/tex}

D

{tex} 7.9 \times 10 ^ { - 2 } {/tex}

Explanation

Q 17.

Correct4

Incorrect-1

For the reversible reaction, {tex} \mathrm { N } _ { 2 ( g ) } + 3 \mathrm { H } _ { 2 ( g ) } \rightleftharpoons 2 \mathrm { NH } _ { 3 ( g ) } + {/tex} heat . The equilibrium shifts in forward direction

A

by increasing the concentration of {tex} \mathrm { NH } _ { 3 ( \mathrm { g } ) } {/tex}

B

by decreasing the pressure

C

by decreasing the concentrations of {tex} \mathrm { N } _ { 2 ( g ) } {/tex} and {tex} \mathrm { H } _ { 2 ( g ) } {/tex}

by increasing pressure and decreasing temperature.

Explanation

Q 18.

Correct4

Incorrect-1

For a given exothermic reaction, {tex} K _ { p } {/tex} and {tex} K _ { p } ^ { \prime } {/tex} are the equilibrium constants at temperatures {tex} T _ { 1 } {/tex} and {tex} T _ { 2 } , {/tex} respectively. Assuming that heat of reaction is constant in temperature range between {tex} T _ { 1 } {/tex} and {tex} T _ { 2 } , {/tex} it is readily observed that

{tex} K _ { p } > K _ { p } ^ { \prime } {/tex}

B

{tex} K _ { p } < K _ { p } ^ { \prime } {/tex}

C

{tex} K _ { p } = K _ { p } ^ { \prime } {/tex}

D

{tex} K _ { p } = \frac { 1 } { K _ { p } ^ { \prime } } {/tex}

Explanation

Q 19.

Correct4

Incorrect-1

{tex} \mathrm { KMnO } _ { 4 } {/tex} can be prepared from {tex} \mathrm { K } _ { 2 } \mathrm { MnO } _ { 4 } {/tex} as per the reaction, {tex} 3 \mathrm { MnO } _ { 4 } ^ { 2 - } + 2 \mathrm { H } _ { 2 } \mathrm { O } \rightleftharpoons 2 \mathrm { MnO } _ { 4 } ^ { - } + \mathrm { MnO } _ { 2 } {/tex} {tex} + 4 \mathrm { OH }^{-} {/tex}
The reaction can go to completion by removing {tex} \mathrm { OH } ^ { - } {/tex} ions by adding

{tex} \mathrm { CO } _ { 2 } {/tex}

B

{tex} \mathrm { SO } _ { 2 } {/tex}

C

{tex} \mathrm { HCl } {/tex}

D

{tex} \mathrm { KOH } {/tex}

Explanation

Q 20.

Correct4

Incorrect-1

Which of these is least likely to act as a Lewis base?

{tex} \mathrm { BF } _ { 3 } {/tex}

B

{tex} \mathrm { PF } _ { 3 } {/tex}

C

{tex} \mathrm { CO } {/tex}

D

{tex} \mathrm { F }^{-} {/tex}

Explanation

Q 21.

Correct4

Incorrect-1

Accumulation of lactic acid {tex} \left( \mathrm { HC } _ { 3 } \mathrm { H } _ { 5 } \mathrm { O } _ { 3 } \right) , \mathrm { a } {/tex} monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10{tex} \mathrm {\ M } {/tex} aqueous solution, lactic acid is 3.7{tex} \% {/tex} dissociates. The value of dissociation constant, {tex} K _ { a } , {/tex} for this acid will be

A

{tex} 1.4 \times 10 ^ { - 5 } {/tex}

{tex} 1.4 \times 10 ^ { - 4 } {/tex}

C

{tex} 3.7 \times 10 ^ { - 4 } {/tex}

D

{tex} 2.8 \times 10 ^ { - 4 } {/tex}

Explanation

Q 22.

Correct4

Incorrect-1

At {tex} 100 ^ { \circ } \mathrm { C } {/tex} the {tex} K _ { w } {/tex} of water is 55 times its value at {tex} 25 ^ { \circ } \mathrm { C } {/tex}. What will be the pH of neutral solution? {tex} ( \log 55 = 1.74 ) {/tex}

A

{tex}7.00 {/tex}

B

{tex}7.87{/tex}

C

{tex}5.13{/tex}

{tex}6.13{/tex}

Explanation



Q 23.

Correct4

Incorrect-1

The values of {tex} K _ { s p } {/tex} of {tex} \mathrm { CaCO } _ { 3 } {/tex} and {tex} \mathrm { CaC } _ { 2 } \mathrm { O } _ { 4 } {/tex} are {tex} 4.7 \times 10 ^ { - 9 } {/tex} and {tex} 1.3 \times 10 ^ { - 9 } {/tex} respectively at {tex} 25 ^ { \circ } \mathrm { C } {/tex} . If the mixture of these two is washed with water, what is the concentration of {tex} \mathrm { Ca } ^ { 2 + } {/tex} ions in water?

A

{tex} 5.831 \times 10 ^ { - 5 } \mathrm { M } {/tex}

B

{tex} 6.856 \times 10 ^ { - 5 } \mathrm { M } {/tex}

C

{tex} 3.606 \times 10 ^ { - 5 } \mathrm { M } {/tex}

{tex} 7.746 \times 10 ^ { - 5 } \mathrm { M } {/tex}

Explanation



Q 24.

Correct4

Incorrect-1

The dissociation constant of a weak acid is {tex} 1 \times 10 ^ { - 4 } {/tex}. In order to prepare a buffer solution with a pH = 5 , the [Salt]/[Acid] ratio should be

A

{tex} 4 : 5 {/tex}

{tex} 10 : 1 {/tex}

C

{tex} 5 : 4 {/tex}

D

{tex} 1 : 10 {/tex}

Explanation

Q 25.

Correct4

Incorrect-1

pH of a saturated solution of {tex} \mathrm { Ba } ( \mathrm { OH } ) _ { 2 } {/tex} is 12. The value of solubility product {tex} \left( K _ { \mathrm { sp } } \right) {/tex} of {tex} \mathrm { Ba } ( \mathrm { OH } ) _ { 2 } {/tex} is

A

{tex} 3.3 \times 10 ^ { - 7 } {/tex}

{tex} 5.0 \times 10 ^ { - 7 } {/tex}

C

{tex} 4.0 \times 10 ^ { - 6 } {/tex}

D

{tex} 5.0 \times 10 ^ { - 6 } {/tex}

Explanation