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Question
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
Options
Na, K, Li
Mg, Ca, Ba
Al, Zn, Pb
Fe, Cu, Ag
Solution
Al, Zn, Pb
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In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
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from water?
Which metal is preferred for the preparation of hydrogen?
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A divalent metal
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Answer the following pertaining to the preparation of hydrogen by electrolysis,
The meaning of the term ‘electrolysis’ and ‘electrolyte’.
Select the correct options for the following statement:
A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.
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A white substance which leaves an amphoteric oxide as a residue [whose colour varies in the heated and in the cold state] and evolves a gas which turns lime water milky.
State the reactant added to hydrogen to obtain the respective product in following case.
Hydrogen sulphide
Give a reason for the following.
Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.
