Question

Give the name of three elements which can be used to liberate H2 gas and three which cannot evolve H2 gas from dilute H2SO4 solution

Answer 1

Potassium, Sodium, and Calcium can liberate hydrogen from dilute H2SO4 solution.
The reactions are as follows:
2K + H2SO4 → K2SO4 + H2↑

2Na + H2SO4 → Na2SO4 + H2↑

Ca + H2SO4 → CaSO4 + H2↑

The elements which are below hydrogen in the reactivity series such as gold, silver, mercury cannot liberate hydrogen from dilute H2SO4.

Hope this helps you.

Answer 2

HERE IS YOUR ANSWER

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All the metals which are above hydrogen can be used to displace hydrogen from dil. H2SO4.

The elements are CALCIUM , POTASSIUM , MAGNESIUM , SODIUM.

The elements which are less reactive than hydrogen cannot liberate hydrogen with dil. H2SO4.

Some.the metals are COPPER , SILVER , GOLD.

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