1.

The solubility of in water is Sb₂S₃ in water is 1.0 x 10^-5 mol/litre at 298 K .What will be its solubility product ?

• 108 x 10^-25

• 1.0 x 10^-25

• 144 x 10^-25

• 126 x 10^-25

What will be the pH value of 0.05 M Ba(OH)₂ solution ?

• 12

• 13

• 1

• 12.96

Which of the following elements never show positive oxidation number ?

• O

• Fe

• Ga

• F

Which of the following element is a metalloid ?

• Bi

• Sn

• Ge

• C

Ionisation depends upon :

• pressure

• volume

• dilution

• none of these

The first ionisation potential is maximum for :

• B

• N

• O

• Be

Which of the following salt does not get hydrolysed in water ?

• KClO₄

• NH₄Cl

• CH₃COONa

• None of these

In the reaction :

H₂ + I₂ $\rightleftharpoons$ 2HI

In a 2 litre flask 0.4 moles of each H₂ and I₂ are taken .At equilibrium 0.5 moles of HI are formed .What will be the value of equilibrium constant ,K_c ?

• 20.2

• 25.4

• 0.284

• 11.11

Which among the following elements have lowest value of IE₁ ?

• Pb

• Sn

• Si

• C

KI and CuSO₄ solution when mixed , give :

• CuI₂ + K₂SO₄

• Cu₂I₂ + K₂SO₄

• K₂SO₄ + Cu₂I₂ + I₂

• K₂SO₄ + CuI₂ + I₂