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CBSE 10th Standard Science Subject Metals and Non-Metals Ncert Exemplar 2 Mark Questions 2021

Published on: 26/05/2021

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Questions:

Generic 2

5 x 2 = 10

Compound X and aluminium are used to join railway tracks.
(a) Identify the compound X
(b) Name the reaction
(c) Write down its reaction.

Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO₃ , hydrogen is not liberated, why?

Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?

During extraction of metals, electrolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?

Iqbal treated a lustrous 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 he will identify the produced gas. Write chemical equations for both the reactions.

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Answers Key:

Generic 2

5 x 2 = 10

(a) X - Fe₂O₃
(b) Thermite reaction
(c) \({ Fe }_{ 2 }{ O }_{ 3 }(s)+2AI(s)\rightarrow 2Fe(I)+{ AI }_{ 2 }{ O }_{ 3 }(s)+Heat\)

It is because HNO₃ is a strong oxidising agent. It oxidises the H₂ produced to H₂O.

It is easier to obtain metal from its oxide, as compared from its sulphides and carbonates.

(a) Anode : Impure silver;
Cathode : Pure silver
(b) Electrolyte : Silver salt, such as AgNO₃
(c) We get pure silver at cathode.

The gas produced can be identified by bringing match stick near the reaction vessel, a pop sound is produced.
\(M+2NaOH\rightarrow { Na }_{ 2 }{ MO }_{ 2 }+{ H }_{ 2 }\\ M+2HCI\rightarrow { MCI }_{ 2 }+{ H }_{ 2 }\)
Thus, the element is a metal.