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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.

Chemistry
Equilibrium Solid State Redox Reactions Chemical Bonding and Molecular Structure Some Basic Concepts of Chemistry s-Block Element (Alkali and Alkaline earth metals) Structure of Atom Organic Chemistry- Some Basic Principles and Techniques Chemical Kinetics Environmental Chemistry Hydrogen Alcohols, Phenols and Ethers Electrochemistry d and f Block Elements Some p-Block Elements General Principles and Processes of Isolation of Elements States of Matter: Gases and Liquids Hydrocarbons Organic Compounds Containing Nitrogen Biomolecules Chemistry in Everyday Life Thermodynamics Classification of Elements and Periodicity in Properties Surface Chemistry Coordination Compounds Aldehydes, Ketones and Carboxylic Acids p-Block Elements Haloalkanes and Haloarenes Solutions Polymers Chemistry
Physics
Communication System Gravitation Current Electricity Magnetic Effects of Current and Magnetism Dual Nature of Matter and Radiation Physical World and Measurement Motion of System of Particles and Rigid Body Behaviour of Perfect Gas and Kinetic Theory Electromagnetic Waves Laws of Motion Properties of Bulk Matter Oscillations and Waves Electromagnetic Induction and Alternating Currents Work, Energy and Power Electrostatics Optics Kinematics Electronic Devices Thermodynamics Atoms and Nuclei Physics
Biology
Diversity in Living World Human Physiology Biology and Human Welfare Reproduction Ecology and Environment Biotechnology - Priciples and Applications Plant Physiology Structural Organization in Animals and Plant Cell Structure and Function Genetics and Evolution Biology
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



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