Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The dissociation equilibrium of a gas AB2 can be represented as

2AB2(g)  2 AB(g) + B2(g)

The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure p is

  • (2Kp/p)1/2

  • Kp/p

  • 2Kp/p

  • (2kp/p)1/3


2.

The correct order of increasing [H3O+] in the following aqueous solutions is

  • 0.01 M H2S < 0.01 M H2SO4 < 0.01M NaCl< 0.01 M NaNO2

  • 0.01 M NaCl<0.01 M NaNO2 <0.01 M H2S <0.01 M H2SO4

  • 0.01 M NaNO< 0.01 M NaCl < 0.01 M H2S <0.01 M H2SO4

  • 0.01 M H2S < 0.01 M NaNO2 < 0.01 M NaCl <0.01M H2SO4


3.

Percentage of Se (at. mass= 78.4) in peroxidase anhydrase enzyme is 0.5% by weight, then minimum molecular mass ofperoxidase anhydrase enzyme is

  • 1.576 x 104

  • 1.576 X 103

  • 15.76

  • 2.136 X 104.


4.

The correct order of dipole moment is

  • CH4 <NF<NH<H2O

  • NF3 <CH4 <NH3 <H2O

  • NH3 <NF3 <CH4 <H2O

  • H2O <NH3 <NF<CH4


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5.

A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?

  • 1.2 g/cm3

  • 2.165g/cm3

  • 3.64 g/cm3

  • 4.56 g/cm3


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6.

Assertion : If H2 and Cl2 enclosed separately in the same vessel exert pressure of 100 and 200 mm respectively, their mixture in the same vessel at the same temperature will exert a pressure of 300 mm.

Reason : Dalton's law of partial pressures states that total pressure is the sum of partial pressures.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


D.

If both assertion and reason are false.

Hand Clreact chemically. Hence Dalton's law is not applicable. Dalton's law states that "at a given temperature, the total pressure exerted by two or more non-reacting gases occupying a definite volume is equal to the sum of the partial pressures of the component gases."


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7.

Assertion : The quantized energy of an electron is largely determined by its principal quantum number.

Reason : The principal quantum number n is a measure of the most probable distance of finding the electron around the nucleus.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


8.

Assertion : According to Le-Chatelier's principle addition of heat to an equilibrium solid liquid results in decrease in the amount of solid.

Reason : Reaction is endothermic, so on heating forward reaction is favoured.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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9.

Assertion : Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature.

Reason : Entropy of the system increases with increase in temperature.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


10.

Assertion : Copper metal gets readily corroded in acidic aqueous solution.

Reason : Free energy change for this process is negative.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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