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Q.

8.4 g MgCO3 on heating leaves behind a residue weighing 4 g carbon dioxide released into the atmosphere at STP will be______ litres

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a

2.24

b

4.48L

c

1.12 L

d

0.56

answer is A.

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Detailed Solution

MgCO3→  MgO + CO2.Thus, 84 g MgCO3 gives 22.4 L of CO2 at STP. Hence 8.4 g will give 2.24L CO2 at STP.
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