NCERT Quiz - Class 10 Science Chapter 1 MCQs

Exercise : Class 10 Science Chapter 1 MCQs — General Questions
1.

Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) ---> 2Pb(s) + CO2(g) (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced.

A
(a) and (b)
B
(a) and (c)
C
(a), (b) and (c)
D
all
Answer: A
Explanation:
This chemical equation represents a redox (reduction-oxidation) reaction where lead(II) oxide is reduced to metallic lead by carbon, which is oxidized to carbon dioxide.
2.

Fe2O3 + 2Al ---> Al2O3 + 2Fe The above reaction is an example of a:

A
combination reaction.
B
double displacement reaction.
C
decomposition reaction.
D
displacement reaction.
Answer: D
Explanation:
Aluminum displaces iron because Al> Fe in the reactivity series. This specific reaction is commonly referred to as the thermite reaction, which is highly exothermic and most commonly used to weld railway tracks in India.
3.

What happens when dilute Hydrochloric acid is added to iron fillings?

A
Hydrogen gas and iron chloride are produced.
B
Chlorine gas and iron hydroxide are produced.
C
No reaction takes place.
D
Iron salt and water are produced.
Answer: A
Explanation:
When we add dilute hydrochloric acid (HCl) to iron filings (Fe), a chemical displacement reaction occurs. Essentially, the Iron "pushes out" the Hydrogen from the acid to take its place.
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