1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Change Language
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
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
KMnO4 can be prepared from K2MnO4 as per the reaction,

3MnO42$$-$$ + 2H2O $$\rightleftharpoons$$ 2MnO4$$-$$ + MnO2 + 4OH$$-$$

The reaction can go to completion by removing OH$$-$$ ions by adding
A
CO2
B
SO2
C
HCl
D
KOH
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of these is least likely to act as a lewis base ?
A
BF3
B
PF3
C
CO
D
F$$-$$
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