25 mL, 0.2 M Ca(OH)₂ is neutralised by 10 mL of 1 M HCI. Then pH of resulting solution is

• 1.37

• 9

• 12

• 7

2SO₂ (g) + O₂ (g) $\stackrel{{\mathrm{V}}_2{\mathrm{O}}_5 \left(\mathrm{s}\right)}{\rightleftharpoons }$  is an example for :

• neutralisation reaction

• homogeneous catalysis

• heterogeneous catalysis

• irreversible reaction

933.

In equilibrium state , the value of $∆$G is :

• zero

• negative

• positive

• may be negative or positive

Which one of the following salts on being dissolved in water gives pH > 7 at 25°C ?

• KCN

• KNO₃

• NH₄Cl

• NH₄CN

Assertion : AgCl is more soluble in NH₃ than in water.

Reason : Ammonia is more polar than water.

• 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 equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature.

Reason: The composition ofthe final equilibrium mixture at a particular temperature depends upon the starting amount of reactants.

• 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 : PCl₅, is covalent in gaseous and  liquid states but ionic in solid state.

Reason : PCl, in solid state consists of tetrahedral PC${\mathrm{l}}_4^{+}$cation and octahedral PC${\mathrm{l}}_6^{-}$ anion.

• 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.

Solubility product of a salt AB is 1 x 10^-8 M in a solution in which the concentration of A⁺ ions is 10^-3 M .The salt , will precipitate when the concentration of B^- ions is kept :

• between 10^-8 M to 10^-7 M

• between 10^-7 M to 10^-8 M

• > 10^-5 M

• < 10^-8 M

The pH of 10^-8 M HCl solution is :

• 8

• more than 8

• between 6 and 7

• slightly more than 7

For a reversible reaction ;

X (g) + 3Y (g) $\rightleftharpoons$ 2Z (g) ; $∆$H = -40 kJ , the standard entropies of X , Y and Z are 60 , 40 and 50JK mol^-1 respectively .The temperature at which the above reaction attains equilibrium is about :

• 400 K

• 500 K

• 273K

• 373K