Solution

pH of a saturated solution of Ba(OH)₂ is 12. The value of solubility product (K_sp)of Ba(OH)₂ is :

3.3 × 10^-7
5.0 × 10^-7
4.0 × 10^-6
5.0 × 10^-6

Solution

Which of the following is least likely to behave as Lewis base ?

H₂O
NH₃
BF₃
OH^–

Solution

BF₃ behaves as lewis acid.

Which one of the following molecular hydrides acts as a Lewis acid?

NH₃
H₂O
B₂H₆
CH₄

Solution

Boron in B₂H₆ is electron deficient.

In a buffer solution containing equal concentration of B^– and HB, the K_b for B^– is 10^–10. The pH of buffer solution is:

Solution

K_b= 10^-10; K_a = 10^-4 or pK_a = 4
For the buffer solution containing equal concentration of B^– and HB
pH = pK_a + log 1
pH = pK_a = 4

Solution

2C(s) + O₂(g) ⇌ CO₂(g)
Δn = 2 – 1 = +1
∴ K_c and K_p are not equal.

The ionization constant of ammonium hydroxide is 1.77 × 10^-5 at 298 K. Hydrolysis constant of ammonium chloride is:

6.50×10^-12
5.65 × 10^-13
5.65× 10^-12
5.65 × 10^-10

Solution

Which of the following molecules acts as a Lewis acid ?

(CH₃)₂O
(CH₃)₃P
(CH₃)₃N
(CH₃)₃B

Solution

(CH₃)₃ B - is an electron deficient, thus behave as a lewis acid

Solution

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

SrCl₂
BaCl₂
MgCl₂
CaCl₂

Solution

The highest pH will be recorded by the most basic solution. The basic nature of hydroxides of alkaline earth metals increase as we move from Mg to Ba and thus the solution of BaCl₂ in water will be most basic and so it will have highest pH.

If the concentration of OH–ions in the reaction Fe(OH)₃(s) ⇌ Fe³⁺(aq) + 3OH^–(aq) is decreased by 14 times, then equilibrium concentration of Fe³⁺ will increase by :

8 times
16 times
64 times
4 times

Solution

Calculate the pOH of a solution at 25°C that contains 1× 10^–10 M of hydronium ions, i.e. H₃O⁺.

Solution

Attempted

0

Correct

0

Wrong

0

Complete

Attempted

Wrong

Correct