1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :
A
6.9
B
7.0
C
1.0
D
7.2
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
A
0.1 L
B
0.9 L
C
2.0 L
D
9.0 L
3
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
4
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
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