Assertion : Aqueous solution of CoCl₂ is pink in colour. It turns blue in presence of conc. HCl.

Reason : It is due to the formation of [CoCl₄]^2-.

• 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 : cis-3-chloroprop-2-enoic acid is less stable than its trans-form.

Reason : Dipole moment of cis-form is greater than trans- form.

• 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: For an isolated system, q is zero.

Reason : In an isolated system, change in U and V is zero.

• 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 : At critical point the densities of substance in gaseous and liquid states are same.

Reason : Critical temperature is the temperature at which the real gas exhibit ideal behaviour for considerable range of pressure.

• 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.

15.

Assertion : Entropy of system increases for a spontaneous reaction.

Reason : Enthalpy of reaction always decreases for spontaneous reaction.

• 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 : Catalyst changes Gibbs free energy of system.

Reason : Catalyst changes pre-exponential factor of a chemical reaction.

• 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 : A process is called adiabatic if the system does not exchange heat with the surroundings.

Reason : It does not not involve increase or decrease in temperature of the system.

• 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 : Number of radial and angular nodes for 3p-orbital are 1, 1 respectively.

Reason : Number of radial and angular nodes depends only on principal quantum number.

• 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 : Bond lengths of P-Cl bonds in gaseous PCl₅ and solid PCl₅ are not equal.

Reason : Because in solid state two PCl₅ molecules are associated.

• 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.

The first ionisation enthalpy of Na, Mg and Si are 496, 737, 776 kJ/mol respectively. What will be the first ionisation enthalpy potential of Al in kJ/mol?

• > 766 kJ/ mol

• > 496 and < 737 kJ

• >737 and < 766 kJ/mol

• >496 kJ/mol