Question

Give reason for the following:
Magnesium gains weight on burning,
Granulated zinc is preferred for the laboratory preparation of
hydrogen gas.
Alkali metals are stored in Kerosene oil.
Silver nitrate is kept in dark coloured bottle in laboratory.
Water can be boiled in paper cup.​

Answer 1

Answer:

Explanation:

Granulated zinc is ideal for the preparation of hydrogen gas in chemical laboratories because it usually contains a small amount of copper, which has the ability to act as a catalyst to the associated chemical reaction and, therefore, increase the rate of the chemical reaction without actually participating in it.

Answer 2

Answer:

Alkali metals are highly reactive because they have only one electron in their valence shell which can easily be lost and metal get oxidized. In presence of water, they react to form highly flammable gas Hydrogen, so they are kept in kerosene.

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