KVPY SA Exam 2013 Question Paper

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Question : 73 of 80

Marks: +1, -0

The amount of metallic Zn (Atomic weight = 65.4) required to react with aqueous sodium hydroxide to produce 1 g

\H_2

, is

32.7 g
98.1 g
65.4 g
16.3 g

Solution:

\Zn + 2\OH^{-} + 2\H_2\O

→ [\Zn (\OH_4)]^{2-} + \H_2

2gm (1 mole)

\H_2

is given by 65.4 gm of Zn
1 gm is given by

65.4/2

gm of Zn

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