Question

A student takes someZn granules in atest tube and adds dilute sulphuric acid to it .is there any effect on the colour of zinc granules

Answer 1

Equation :
H_2SO_4 + Zn —> ZnSO_4 + H_2O

Observations :

When dilute sulphuric acid is poured on zinc granules, then zinc sulphate is formed along with the evolution of a gas. Zinc is more reactive than hydrogen, so displaced it from sulphuric acid.
The gas evolved is hydrogen. We can test its presence by bringing a burning candle near the mouth of the test tube and hearing for a popping sound. Only hydrogen gas burns with a 'pop' sound.

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