For the reaction
N2 (g) + O2 (g) 2NO (g), the value of Kc at 800°C is 0.1. When the equilibrium concentration of both the reactants is 0.5 mol, what is the value of Kp at the same temperature?
0.5
0.1
0.01
0.025
A buffer solution has equal volumes of 0.2 M NH4OH and 0.02 M NH4Cl. The pKb of the base is 5. The pH is
10
9
4
7
A precipitate of AgCl is formed when equal volumes of the following are mixed [Ksp for AgCl = 10-10]
10-4 M AgNO3 and 10-7 M HCl
10-5 M AgNO3 and 10-6 M HCl
10-5 M AgNO3 and 10-4 M HCl
10-6 M AgNO3 and 10-6 M HCl
4 moles each of SO2 and O2 gases are allowed to react to form SO3, in a closed vessel. At equilibrium 25% of O2 is used up. The total number of moles of all the gases at equilibrium is :
6.5
7.0
8.0
2.0
Solubility product of a salt AB is 1 x 10-8 M2 in a solution in which the concentration of A+ ions is 10M.The salt will precipitate when the concentration of B ions is kept :
between 10-8 M to 10-7 M
between 10-7 M to 10-8 M
>10-5 M
<10-8 M
Hydroxyl ion concentration of 10-2 M HCl is
1 × 101 mol dm-3
1 × 10-12 mol dm-3
1 × 10-1 mol dm-3
1 × 10-14 mol dm-3
Which one of the following salts on being dissolved in water gives pH > 7 at 25°C?
KCN
KNO3
NH4Cl
NH4CN
A.
KCN
KCN is a salt of weak acid and strong base hence, on being dissolved in water it gives basic solution i.e. pH > 7 at 25°C.