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Question
Give balanced equation for the following conversion:
Zinc to sodium zincate – using an alkali.
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Solution
Zinc to sodium zincate.
\[\ce{Zn + 2NaOH ->\underset{\text{Sodium Zincate}}{Na2ZnO2} + H2}\]
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In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:
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The diagram represent the preparation and collection of hydrogen by a standard
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State what is added through the thistle funnel ‘Y’
The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

State what difference will be seen if pure zinc is added in the distillation flask ‘X’ instead of granulated zinc.
The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

Name a solution which absorbs the impurity – `"H"_2"S"`
The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

State, why hydrogen is collected after all the air in the apparatus, is allowed to escape.
The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

Name a gas other than hydrogen collected by the same method.
