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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals3 Marks
Question
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
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Answer

The divalent element M is a metal. It reacts with both sodium hydroxide (alkali) and dilute hydrochloric acid to evolve hydrogen gas.
$M(s)+2 NaOH(aq) \rightarrow Na_2 MO_2(aq)+H_2(g)$
$M(s)+2 HCl(aq) \rightarrow MCl_2(aq)+H_2(g)$
The gas burns with a pop sound when a burning match stick is brought near it.

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