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ICSE Class 10 Chemistry 2015 Paper

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Consider the following reaction and based on the reaction answer the questions that follow :
(NH4)2Cr2O7→heatN2(g)+4H2O(g)+Cr2O3(\mathrm{NH}_4)_2\mathrm{Cr}_2\mathrm{O}_7 \xrightarrow{\text{heat}} \mathrm{N}_2(g)+4\mathrm{H}_2\mathrm{O}(g)+\mathrm{Cr}_2\mathrm{O}_3
Calculate:
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Question : 62 of 85
Marks: +1, -0
the volume in litres or dm3\mathrm{dm}^3 of N2\mathrm{N}_2 evolved at S.T.P.
Solution:  
If 252 gm252\ \mathrm{gm} of (NH4)2Cr2O7(\mathrm{NH}_4)_2\mathrm{Cr}_2\mathrm{O}_7 release 22.4 l22.4\ \mathrm{l} of N2\mathrm{N}_2 at STP
Then 63 gm63\ \mathrm{gm} of (NH4)2Cr2O7(\mathrm{NH}_4)_2\mathrm{Cr}_2\mathrm{O}_7 release =22.4252×63=5.6 l=\frac{22.4}{252} \times 63 = 5.6\ \mathrm{l} .
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