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

During the formation of a chemical bond :

• electron-electron repulsion becomes more than the nucleus-electron attraction

• energy of the system does not change

• energy increases

• energy decreases

Which ofthe following is an intensive property ?

• Temperature

• Viscosity

• Surface tension

• All of these

4.

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

• zero

• negative

• positive

• may be negative or positive

Molarity of a given orthophosphoric acid solution is 3 M .It's normality is :

• 9 N

• 0.3 N

• 3 N

• 1 N

Hydroxyl ion concentration of 10^-2 M HCl is :

• 1 x 10¹ mol dm^-3

• 1 x 10^-12 mol dm^-3

• 1 x 10^-1 mol dm^-3

• 1 x 10^-14 mol dm^-3

For a certain particle , it is found that uncertainty in velocity is reciprocal of uncertainty in position .This implies that :

• mass of particle > unity

• mass of particle = unity

• mass of particle $\le$ h

• mass of particle $\ge$ h / 4$\mathrm{\pi }$

Entropy of the universe is :

• constant

• zero

• continuously decreasing

• continuously increasing

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

• KCN

• KNO₃

• NH₄Cl

• NH₄CN

The volume of 10N and 4N HCl required to make 1 L of 7N HCl are :

• 0.50 L of 10N HCl and 0.50 L of 4N HCl

• 0.60 L of 10N HCl and 0.40 L of 4N HCl

• 0.80 L of 10N HCl and 0.20 L of 4N HCl

• 0.75 L of 10N HCl and 0.25 L of 4N HCl