A student adds del.HCI to a test tube containing zinc granules and make following observations. 1) the surface of zinc becomes black. 2) a gas is evolved which burnt with a pop sound.
3) the solution remains colourless.
a) 1 and 2. b) 1 and 3.
c) 2 and 3. d) 1,2 and 3.
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When HCl is added to Zinc granules, a reaction takes place between them .
2HCl + Zn -> ZnCl2 + H2
This reaction takes place because Zn is more reactive than H2 and hence displaces it from its compound.
The gas which evolves with a pop sound is H2
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