11.

An inorganic salt (A) is decomposed on heating to give two products (B) and (C). Compound (C) is a liquid a room temperature and is neutral to litmus while the compound (B) is a colourless neutral gas. Compounds (A), (B) and (C) are 

• NH₄NO₃, N₂O, H₂O

• NH₄NO₂, NO, H₂O

• CaO, H₂O, CaCl₂

• Ba(NO₃)₂, H₂O, NO₂

In the dichromate dianion, the nature of bonds are

• for equivalent Cr-O bonds

• six equivalent Cr-O bonds and one O-O bond

• six equivalent Cr-O bonds and one Cr-Cr bond

• six equivalent Cr-O bonds and one Cr-O-Cr bond

At constant external pressure of one atmosphere, 4 moles of a metallic oxide MO₂ undergoes complete decomposition at 227°C in an open vessel according to the equation

2MO₂ (s) → 2MO (s) + O₂ (g)

The work done by the system in kJ is (R = 8.3 kJ mol^-1)

• -16.6

• -24.9

• -33.2

• -4.15

A certain reaction has a $∆$H of 12 kJ and a $∆$S of 40 JK^-1. The temperature above which the reaction becomes spontaneous is

• 27°C

• 27 K

• 300°C

• 30 K

The sum of pH and pK_b for a basic buffer solution is 13. The ratio of the concentration of the base to that of the salt is

• 10

• 1

• 0.05

• 0.1

Two equilibria, AB $\rightleftharpoons$ A +B. are simultaneously maintained in a solution with equilibrium constants, K₁ and K₂ respectively. The ratio of [A⁺] to [AB${}_2^{-}$] in the solution is

• directly proportional to [B^-]

• inversely proportional to [B^-]

• directly proportional to the square of [B^-]

• inversely proportional to the square of [B^-]

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

Amongst the following ions which one has the highest magnetic moment value? (At. no. Co = 27, Ni = 28)

• [Co(NH₃)₆]³⁺

• [CoF₆]^3-

• [NiCl₄]^2-

• [Ni(CN)₄]^2-

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