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In which of the following reactions, Hyd...

In which of the following reactions, Hydrogen is liberated?
(a ) Al(s) + HCl(aq) `rightarrow` .
(b) Al(s) + `NaOH_(aq) rightarrow` .
(c ) `NaBH_4 + I_2 rightarrow`

A

I, ii

B

ii, iii

C

I, iii

D

I, ii, iii

Text Solution

Verified by Experts

The correct Answer is:
D
(a), (b) and (c) all given `H_(2)` gas as follows :
(a) `2A (s) + 6HCl(aq) to 2AlCl_(3) (aq) + 3H_(2)`
(b) `2Al(s) + 2NaOH(aq)tounderset("Sodium tetrhydroxo aluminate (III)")(2Na[Al(OH)_(4)])+3H_(2) `
(c) `NaBH_(4) +l_(2)tounderset(2BH_(3)+2Nal+H_(2))underset(darr(NaBH_(4)))(BH_(3)+Nal+HI)`
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