11.

One percent composition of an organic compound A is, carbon : 85.71% and hydrogen 14.29%. Its vapour density is 14. Consider the following reaction sequence-

Identify .

• CH₃CH(OH)-CO₂H

• HO-CH₂-CH₂-CO₂H

• HO-CH₂-CO₂H

• CH₃-CH₂-CO₂H

At 25°C, the molar conductances at infinite dilution for the strong electrolytes NaOH, NaCl and BaCl₂ are 248 × 10^-4, 126 × 10^-4 and 280 × 10^-4 Sm² mol^-1 respectively, ${\mathrm{\lambda }}_{\mathrm{m}}^{°}$ (BaOH)₂ in Sm² mol^-1 is

• 52.4 × 10^-4

• 524 × 10^-4

• 402 × 10^-4

• 262 × 10^-4

The equilibnum constant for the given reaction is 100.

N₂ (g) + 2O₂ (g) $\rightleftharpoons$ 2NO₂ (g)

What is the equilibrium constant for the reaction given below?

NO₂ (g) $\rightleftharpoons \frac{1}{2}{\mathrm{N}}_2$ (g) + O₂ (g)

• 10

• 1

• 0.1

• 0.01

20 mL of 0.1 M acetic acid is mixed with 50 mL of potassium acetate. K_a of acetic acid = 1.8 × 10^-5 at 27°C. Calculate concentration of potassium acetate if pH of the mixture is 4.8.

• 0.1 M

• 0.04 M

• 0.4 M

• 0.02 M

Calculate $∆\mathrm{H}°$ for the reaction,

Na₂O (s) + SO₃ (g) → Na₂SO₄ (g) given the following-

(A) Na (s) + H₂O (l) → NaOH (s) + $\frac{1}{2}$H₂ (g) ; $∆$H° = -146 kJ

(B) Na₂SO₄ (s) + H₂O (l) → 2NaOH (s) + SO₃ (g) ; $∆\mathrm{H}°$ = +418 kJ

(C) 2Na₂O (s) + 2H₂ (g) → 4Na (s) + 2H₂O (l); $∆\mathrm{H}°$ = +259 kJ

• +823 kJ

• -581 kJ

• -435 kJ

• +531 kJ

One mole of alkene $\underline{\mathrm{X}}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of $\underline{\mathrm{X}}$ is

• 2-methyl-2-butene

• 2-methyl-1-butene

• 2-butene

• 1-butene

The chemical entities present in thermosphere of the atmosphere are

• O${}_2^{+}$, O⁺, NO⁺

• O₃

• N₂, O₂, CO₂, H₂O

• O₃, O${}_2^{+}$, O₂

SiCl₄ on hydrolysis forms 'X' and HCl. Compound 'X' loses water at 1000°C and gives 'Y'. Compounds 'X' and 'Y' respectively are

• H₂SiCl₆, SiO₂

• H₄SiO₄, Si

• SiO₂, Si

• H₄SiO₄, SiO₂

Assertion (A) -  K, Rb and Cs form superoxides.

Reason (R) - The stability of the superoxides increases from K to Cs due to decrease in lattice energy.

The correct answer is

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true but (R) is not true.

• (A) is not true but (R) is true.

How many mL of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2 L of SO₂ gas to SO₃ gas?

• 10 mL

• 5 mL

• 20 mL

• 30 mL