First slide

Hydrogen

Question

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is

Easy

A

1: 1
B

1 : 2
C

2 : 1
D

9 : 4

Solution

$\large 1mole = \mathop {\boxed{65gr}}\limits^{\;\;\;\;\;\;\;\;Zn} + \mathop {{H_2}S{O_4}}\limits_{Excess} \xrightarrow{{}}ZnS{O_4} + {H_2} \uparrow \$
$\large 1mole = \mathop {\boxed{65gr}}\limits^{\;\;\;\;\;\;\;\;Zn} + \mathop {2NaOH}\limits_{Excess} \xrightarrow{{}}NaZnO_2 + {H_2} \uparrow \$
1:1 ratio of H₂ gas is liberated when same amount of Zn is treated seperately with excess of H₂SO₄ & NaOH

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