The dissociation equilibrium of a gas AB₂ can be represented as

$2{\mathrm{AB}}_{2_{\left(\mathrm{g}\right)}} \leftrightharpoons 2 {\mathrm{AB}}_{\left(\mathrm{g}\right)} + {\mathrm{B}}_{2_{\left(\mathrm{g}\right)}}$

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

• (2K_p/p)^1/2

• K_p/p

• 2K_p/p

• (2kp/p)^1/3

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 NaNO₂ < 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

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.

The correct order of dipole moment is

• CH₄ <NF₃ <NH₃ <H₂O

• NF₃ <CH₄ <NH₃ <H₂O

• NH₃ <NF₃ <CH₄ <H₂O

• H₂O <NH₃ <NF₃ <CH₄

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

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.

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.

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

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

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• 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.

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.

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• If assertion is true but reason is false.

• If both assertion and reason are false.

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

Reason : Free energy change for this process is negative.

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• 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.