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CBSE 10th Standard Science Subject Chemical Reactions and Equations Ncert Exemplar MCQ Questions 2021

Published on: 25/05/2021

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Questions:

Multiple Choice Question

4 x 1 = 4

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

(a)

KMnO₄ is an oxidising agent, it oxidises FeSO₄

(b)

FeSO₄ acts as an oxidising agent and oxidises KMnO₄

(c)

The colour disappears due to dilution; no reaction is involved

(d)

KMnO₄ is an unstable compound and decomposes in presence of FeSO₄ to a colourless compound.

Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor(crystals)

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(i) and (iv)

(d)

(iii) and (iv)

Which of the following statements about the given reaction are correct?
3Fe(s) + 4H₂O(g) \(\rightarrow\) Fe₃O₄(s) + 4H₂(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent

(a)

(i), (ii) and (iii)

(b)

(iii) and (iv)

(c)

(i), (ii) and (iv)

(d)

(ii) and (iv)

Fe₂O₃ + 2Al \(\rightarrow\) Al₂O₃ + 2Fe.
The above reaction is an example of a

(a)

Combination of reaction

(b)