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Question

The following reaction is an example of a
2Pb(NO3)2(s)Heat−−2PbO(s)+4NO2(g)+O2(g)
I. Combination reaction
II.
Decomposition reaction
III. Endothermic reaction
IV. Exothermic reaction

A
I & III
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B
II & III
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C
II & IV
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D
I & IV
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Solution

The correct option is B II & III
In the given reaction a single compound (Pb(NO3)2) on heating is breaking down to form other different compounds (PbO,NO2,O2). Hence, it is a type of decomposition reaction.
As heat is provided for the reaction to happen, it is also a endothermic reaction.

In other words, we can also say that it is a thermal decomposition reaction.
So both II - decomposition & III - endothermic are correct.

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