A current strength of 9.65 A is passed through excess fused AlCl₃ for 5 h. How many litres of chlorine will be liberated at STP? (F = 96500 C)

• 2.016

• 1.008

• 11.2

• 20.16

The colour of the soltuion/ precipitate obtained in the elemental analysis of an organic compound and the molecule/ion responsible for the colour are given below. Choose the incorrectly matched pair.

• Prussian blue - Fe₄[Fe(CN)₆]₃.xH₂O

• Yellow - (NH₄)₂MoO₄

• Violet colour - [Fe(CN)₅NOS]^4-

• Blood red colour - [Fe(SCN)]²⁺

Among the following amines, which one has the highest pK, value in aqueous solution?

• Methanamine

• N, N-dimethylaniline

• Ethanamine

• Benzenamine

In the following equilibrium reaction,

2A $\rightleftharpoons$ B + C

the equilibrium concentration of A, B and C are 1 × 10^-3 M, 2 × 10^-3 M and 3 × 10^-3 M respectively at 300 K. The value of K_c for this equilibrium at the same temperature is

• $\frac{1}{6}$

• 6

• $\frac{1}{36}$

• 36

Which one of the following is the correct statement?

• HCO${}_3^{-}$ is the conjugate base of CO${}_3^{2-}$

• NH${}_2^{-}$ is the conjugate acid of NH₃

• H₂SO₄ is the conjugate acid of HSO${}_4^{-}$

• NH₃ is the conjugate base of NH${}_2^{-}$

486.

Choose the weak monobasic acid, among the following

• H₃BO₃

• H₃PO₃

• H₃PO₄

• HNO₃

In the reaction H₂S+ H₂O₂ → S+ 2H₂O

• H₂S is an acid and H₂O₂ is a base

• H₂S is a base and H₂O₂ is an acid

• H₂S is an oxidising agent and H₂O₂ is a reducing agent

• H₂S is an reducing agent and H₂O₂ is a oxidising agent

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

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