When zinc metal reacts with dilute sulphuric acid, a gas is evolved. Which one is a correct statement about the nature of this gas ?
(1) colourless with suffocating odour
(2) reddish brown and odourless
(3) colourless and sweet smelling
(4) colourless and odourless

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Solution

When zinc reacts with dilute hydrochloric acid, it gives zinc chloride and hydrogen gas evolves. Hydrogen is colourless and odourless gas which evolves with bubbles.
$Zn (s) + 2 HCl (aq) \to {ZnCl}_{2} (aq) + H_{2} (g)$

Hence, the correct answer is option 4.

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When zinc metal reacts with dilute sulphuric acid, a gas is evolved. Which one is a correct statement about the nature of this gas ? (1) colourless with suffocating odour (2) reddish brown and odourless (3) colourless and sweet smelling (4) colourless and odourless

When zinc reacts with dilute hydrochloric acid, it gives zinc chloride and hydrogen gas evolves. Hydrogen is colourless and odourless gas which evolves with bubbles. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) Hence, the correct answer is option 4.

When zinc metal reacts with dilute sulphuric acid, a gas is evolved. Which one is a correct statement about the nature of this gas ?
(1) colourless with suffocating odour
(2) reddish brown and odourless
(3) colourless and sweet smelling
(4) colourless and odourless

When zinc reacts with dilute hydrochloric acid, it gives zinc chloride and hydrogen gas evolves. Hydrogen is colourless and odourless gas which evolves with bubbles.
$Zn (s) + 2 HCl (aq) \to {ZnCl}_{2} (aq) + H_{2} (g)$

Hence, the correct answer is option 4.