Chemistry
Grade-8
Easy
Question
Although all active metals liberate Hydrogen gas with acids, zinc is preferentially used in the laboratory preparation of Hydrogen. Various metals are not suitable for different reasons. The metals and the reasons for their non-suitability are given below. Identify the wrong set:
- Potassium – violent explosion
- Lead - Reversible reaction
- Aluminium - Formation of protective coating
- Magnesium - High cost
Hint:
It forms insoluble salts and stops reaction.
The correct answer is: Lead - Reversible reaction
The correct option is b)Lead - Reversible reaction.
Lead is above hydrogen in the metal activity series (hydrogen is included to compare reactivity with other metals). So it can replace H from the compound.
In reaction with acids, insoluble lead salts are formed that form a coating on pure lead, preventing further reaction. Therefore, lead is not used in manufacturing.
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