Which of the following are usually used for the preparation of H2 gas in laboratory?
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a
Granulated impure Zn and dilute HCI
b
Pure Zn and conc. HCI
c
Pure Zn and conc.H2SO4
d
All of the above
answer is A.
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Detailed Solution
Granulated Zn is porous and impure. rt has high surface area, high reactivity and forms Galvanic cell in dilute HCI to produce H2 gas easily.Zn+2H+→ Zn2++H2