A student added dilute HCl to a test tube containing zinc granules and made following observation:

i)                    Zinc surface become dull and black

ii)                 A gas evolved which burnt with a pop sound

iii)               The solution remained colourless

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i and ii

i and iii

ii and iii

i , ii and iii

answer is D.

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Detailed Solution

A student added dilute HCl to a test tube containing zinc granules and made the zinc surface become dull and black , a gas which evolved which burnt with a pop sound and also the solution remained colourless.
Zn+2HCl → ZnCl2 + H. Zinc loses its shine as a result of the acid's reaction with it.
The reaction results in the evolution of H2. With the aid of a burning matchstick, we can detect the gas. Its existence is signalled by a pop sound. Since the reaction produces colourless zinc chloride, the solution does not change colour. As a result, each sentence is true. The right selection is option 4.

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