11.

The solubility product (Ks) of the following compounds are given at 25°C

Compounds	Ksp
AgCl	1.1 × 10-10
AgI	1.0 × 10-16
PbCrO4	4.0 × 10-14
Ag2CO3	8.0 × 10-12

The most soluble and least soluble compounds are

• AgCl and PbCrO₄

• AgI and Ag₂CO₃

• AgCl and Ag₂CO₅

• Ag₂CO₃ and AgI

Four moles of PCl₅ are heated in a closed 4 dm³ container to reach equilibrium at 400 K. At equilibrium 50% of PCl₅ is dissociated. What is the value of K_c for the dissociation of PCl₅ into PCl₃ and Cl₂ at 400 K?

• 0.50

• 1.00

• 1.25

• 0.05

At 25°C, at 5% aqueous solution of glucose (molecular weight = 180g mol^-1) is isotonic with a 2% aqueous solution containing and unknown solute. What is the molecular weight of the unknown solute?

• 60

• 80

• 72

• 63

A weak monobasic acid is 1% ionized in 0.1 M solution at 25°C. The percentage of ionisation in its 0.025 M solution is

• 1

• 2

• 3

• 4

The stablest radical among the following is

• C₆H₅ - CH₂ - $\stackrel{.}{\mathrm{C}}$H₂

• CH₃$\stackrel{.}{\mathrm{C}}$H₂

• C₆H₅ - $\stackrel{.}{\mathrm{C}}$H₂-CH₃

• CH₃-$\stackrel{.}{\mathrm{C}}$H-CH₃

Be and Al exhibit diagonal relationship. Which of the following statements about them is/ are not true?

I. Both react with HCl to liberate H2

II. They are made passive by HNO₃

Ill. Their carbides give acetylene on treatment with water

IV. Their oxides are amphoteric

• III only

• III and IV

• I and III

• I only

Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H₂O₂ and O₂?

• Li₂O

• Na₂O₂

• NaO₂

• Na₂O

A solution containing 1.8 g of a compound (empirical formula CH₂O) in 40 g of water is observed to freeze at -0.465°C. The molecular formula of the compound is (k_f of water = 1.86 kg K mol^-1)

• C₂H₄O₂

• C₃H₆O

• C₆H₁₂O₆

• C₅H₁₀O₅

In the disproportionation reaction,

3HClO₃ → HClO₄ + Cl₂ + 2O₂ + H₂O

the equivalent mass of the oxidising agent is (molar mass of HClO₃ = 84.45)

• 16.89

• 32.22

• 84.45

• 28.15

The IUPAC name of the compound CH₃-CH(CH₃) CO- CH₃ is

• 3-methyl 2-butanone

• 2-methyl 3-butanone

• isopropyl methyl ketone

• methyl isopropyl ketone