1
NEET 2013 (Karnataka)
+4
-1
Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, Ka, for this acid will be
A
1.4 $$\times$$ 10$$-$$5
B
1.4 $$\times$$ 10$$-$$4
C
3.7 $$\times$$ 10$$-$$4
D
2.8 $$\times$$ 10$$-$$4
2
NEET 2013 (Karnataka)
+4
-1
At 100oC the Kw of water is 55 times its value at 25oC. What will be the pH of neutral solution? (log 55 = 1.74)
A
7.00
B
7.87
C
5.13
D
6.13
3
NEET 2013 (Karnataka)
+4
-1
The values of Ksp of CaCO3 and CaC2O4 are 4.7 $$\times$$ 10$$-$$9 and 1.3 $$\times$$ $$-$$9 respectively at 25oC. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water ?
A
5.831 $$\times$$ 10$$-$$5 M
B
6.856 $$\times$$ 10$$-$$5 M
C
3.606 $$\times$$ 10$$-$$5 M
D
7.746 $$\times$$ 10$$-$$5 M
4
NEET 2013 (Karnataka)
+4
-1
The dissociation constant of weak acid is 1 $$\times$$ 10$$-$$4. In order to prepare a buffer solution with a pH = 5, the [Salt]/[Acid] ratio should be
A
4 : 5
B
10 : 1
C
5 : 4
D
1 : 10
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