1
JEE Main 2019 (Online) 12th April Evening Slot
+4
-1
The molar solubility of Cd(OH)2 is 1.84 × 10–5 M in water. The expected solubility of Cd(OH)2 in a buffer solution of pH = 12 is :
A
2.49 × 10–10 M
B
1.84 × 10–9 M
C
6.23 × 10–11 M
D
$${{2.49} \over {1.84}} \times {10^{ - 9}}M$$
2
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
What is the molar solubility of Al(OH)3 in 0.2 M NaOH solution ? Given that, solubility product of Al(OH)3 = 2.4 × 10–24 :
A
3 × 10–22
B
3 × 10–19
C
12 × 10–21
D
12 × 10–22
3
JEE Main 2019 (Online) 10th April Evening Slot
+4
-1
The pH of a 0.02 M NH4Cl solution will be :
[given Kb (NH4OH) = 10–5 and log 2 = 0.301]
A
2.56
B
5.35
C
4.35
D
4.65
4
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
Consider the following statements
(a) The pH of a mixture containing 400 mL of 0.1 M H2SO4 and 400 mL of 0.1 M NaOH will be approximately 1.3
(b) Ionic product of water is temperature dependent.
(c) A monobasic acid with Ka = 10–5 has pH = 5. The degree of dissociation of this acid is 50 %.
(d) The Le Chatelier's principle is not applicable to common-ion effect.

The correct statements are :
A
(a) and (b)
B
(a), (b) and (c)
C
(a), (b) and (d)
D
(b) and (c)
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