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Question

For the reaction,
CaCO3(s)CaO(s)+CO2(g); Δn=?

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is A 1
For a reaction, aA+bBcC+dD
Δn=(c+d)(a+b).
Here, c=0,d=1,a=0,b=0, thus, Δn=+1

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