Question

Which of these metals cannot produce hydrogen on reacting with a dilute acid?
(a) Iron
(6) Zinc
(c) Calcium
(d) Gold​

Answer 1

Answer:

gold as it is very less reactive and dissociate only in aqua regia . That's why it doesn't produce H2

AQUA REGIA IS A COMBINATION OF CONC. HCl AND HNO3.

so, it doesn't produce H2 in dil. acid

Answer 2

Answer:

GOLD

Explanation:

gold do not react with dilute acids. The metals like Cu,Au,Ag are less reactive than hydrogen.They do not displace hydrogen from dilute acids. Those metals which are above in the reactivity series displace hydrogen from dilute acids. 2Na (s) + H2SO4 (aq) ——> Na2SO4 (aq) + H2 (g)

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