21.

Which of the following aqueous solution should have a highest boiling point?

• 1.0 M NaOH

• 1.0 M Na₂SO₄

• 1.0 M NH₄NO₃

• 10 MKNO₃

When a lead storage battery is discharged;

• SO₂ is evolved

• lead sulphate is consumed

• lead is formed

• sulphuric acid is consumed

Combustion of glucose takes place according to the equation.

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

Δ = - 72 k-cal

The energy required for combustion of 1.6 g of glucose is

• 0.064 kcal

• 0.64 kCal

• 6.4 kcal 

• 64 kcal

when the heat of reaction at constant pressure is -2.5 x 10³ cal can entropy change is 7.4 cal deg^-1 at 25^oC, the reaction is predicted as

• reversible

• Spontaneous

• non -spontaneous

• Irreversible

For the chemical reaction,

2O₃ ⇌ 3O₂

The reaction proceeds as follows

O₃ ⇌ O₂ + O

O + O₃ → 2O₂ (slow)

The rate law expression will be

• r = k' [O₃]²

• r = k' [O₃]²[O₂]^-1

• r = k'[O₃][O₂]

• unpredictable

Among the following compounds, which will produce POCl₃ with PCl₅

• Only O₂

• O₂ and CO₂

• CO₂, O₂ and P₄O₁₀

• SO₂, H₂O, H₂SO₄ and P₄O₁₀

In the following graph

The slope of line AB give the information of the

• value of $\frac{{\mathrm{E}}_{\mathrm{a}}}{2.303}$

• Value of $\frac{2.303}{{\mathrm{E}}_{\mathrm{a}}}$

• value of $-\frac{{\mathrm{E}}_{\mathrm{a}}}{2.303}$

• value of $-\frac{{\mathrm{E}}_{\mathrm{a}}}{2.303 \mathrm{RT}}$

The value of reaction quotient [Q], for the following cell

Zn(s)|Zn²⁺ (0.01 M)|| Ag⁺ (1.25 M | Ag (s) is

• 156

• 125

• 1.25 x 10^-2

• 6.4 x 10^-3

Which of the following is not applicable to the phenomenon of adsorption?

• ΔH> 0

• ΔG<0

• ΔS<0

• ΔH<0

In cyanide extraction process of silver from argentite ore, the oxidising and reducing agents are respectively.

• O₂ and CO₂

• O₂ and Zn dust

• HNO₃ and Zn dust

• HNO₃ and CO