1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of this acid is :
A
3 $$\times$$ 10–1
B
1 $$\times$$ 10–3
C
1 $$\times$$ 10–5
D
1 $$\times$$ 10–7
2
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
Three reactions involving $$H_2PO_4^−$$ are given below :

(i) H3PO4 + H2O $$\to$$ H3O+ + $$H_2PO_4^−$$

(ii) $$H_2PO_4^−$$ + H2O $$\to$$ $$HPO_4^{2−}$$ + H3O+

(iii) $$H_2PO_4^−$$ + OH- $$\to$$H3PO4 + O2-

In which of the above does $$H_2PO_4^−$$ act as an acid?
A
(ii) only
B
(i) and (ii)
C
(iii) only
D
(i) only
3
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
Solubility product of silver bromide is 5.0 $$\times$$ 10–13. The quantity of potassium bromide (molar mass taken as 120g of mol–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is :
A
1.2 $$\times$$ 10–10 g
B
1.2 $$\times$$ 10–9 g
C
6.2 $$\times$$ 10–5 g
D
5.0 $$\times$$ 10–8 g
4
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
At 25°C, the solubility product of Mg(OH)2 is 1.0 $$\times$$ 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions?
A
9
B
10
C
11
D
8
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