The acid strength of active methylene group in

I. CH₃COCH₂COOC₂H₅

II. CH₃COCH₂COCH₃

III. C₂H₅OOCCH₂COOC₂H₅

decreases as

• I > III > II

• I > II > III

• II > I > III

• III > I > II

12.

A metallic oxide reacts with water to from its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be

• CaO

• KO₂

• Li₂O

• Na₂O₂

For an ideal binary liquid mixture.

• $∆{\mathrm{S}}_{\left(\mathrm{mix}\right)} = 0; ∆{\mathrm{G}}_{\left(\mathrm{mix}\right)} = 0$

• $∆{\mathrm{H}}_{\left(\mathrm{mix}\right)} = 0; ∆{\mathrm{S}}_{\left(\mathrm{mix}\right)} < 0$

• $∆{\mathrm{V}}_{\left(\mathrm{mix}\right)} = 0; ∆{\mathrm{G}}_{\left(\mathrm{mix}\right)} > 0$

• $∆{\mathrm{S}}_{\left(\mathrm{mix}\right)} > 0; ∆{\mathrm{G}}_{\left(\mathrm{mix}\right)} < 0$

Which one of these is not known?

• CuCl₂

• CuI₂

• CuF₂

• CuBr₂

A plot of $\frac{1}{T}$ vs k for a reaction gives the slope -1 × 10⁴ K. The energy of activation for the reaction is (Given, R = 8.314 K^-1 mol^-1)

• 8314 J mol^-1

• 1.202 kJ mol^-1

• 12.02 J mol^-1

• 83.14 kJ mol^-1

MnO₂ + HCl $\stackrel{∆}{\to }$ A (g)

A (g) + F₂ (excess) $\stackrel{573 K}{\to }$ B (g)

B (l) + U (s) → C (g) + D (g)

The gases A, B, C and D are respectively

• Cl₂, ClF, UF₆, ClF₃

• Cl₂, ClF₃, UF₆, ClF

• O₂, OF₂, U₂O₃, O₂F₂

• O₂, O₂F₂, U₂O₃, OF₂

One mole of ammonia was completely absorbed in one litre solution each of

I. 1 M HCl

II. 1 M CH₃COOH 

III. 1 M H₂SO₄ at 298 K

The decreasing order for the pH of the resulting solution is (Given K_b (NH₃) = 4.74)

• II > III > I

• I > II > III

• II > I > III

• III > II > I

5.5 mg of nitrogen gas dissolves in 180 g of water at 273 K and 1 atm pressure due to nitrogen gas. The mole fraction of nitrogen in 180 g of water at 5 atm nitrogen pressure is approximately

• 1 × 10^-6

• 1 × 10^-5

• 1 × 10^-3

• 1 × 10^-4

50 cm³ of 0.04 M K₂Cr₂O₇ in acidic medium oxidises a sample of H₂S gas to sulphur. Volume of 0.03 M KMnO₄ required to oxidize the same amount of H₂S gas to sulphur, in acidic medium is 

• 60 cm³

• 80 cm³

• 90 cm³

• 120 cm³

The pair of compounds having identical shapes for their molecules is

• CH₄, SF₄

• BCl₃, ClF₃

• XeF₂, ZnCl₂

• SO₂, CO₂