Equilibrium

Deep blue CusO₄·5H₂O is converted to a bluish white salt at 100°C. At 250°C and 750°C it is then transformed to a white powder and black material respectively. Identify the salts.

The solubility of Ca₃(PO₄)₂ in water is y mol/L. Its solubility product is

• 6y⁴

• 36y⁴

• 64y⁵

• 108y⁵

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^-]

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⁺

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

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

The most soluble and least soluble compounds are

• AgCl and PbCrO₄

• AgI and Ag₂CO₃

• AgCl and Ag₂CO₅

• Ag₂CO₃ and AgI

The dissociation constant of acetic acid Ka is 1.74 × 10^-5 at 298 K. The pH of a solution of 0.1 M acetic acid is :

• 2.88

• 3.6

• 4.0

• 1.0

0.365g of HCl gas was passed through 100 cm³ of 0.2 M NaOH solution. The pH of the resulting solution would be :

• 13

• 9

• 8

• 5