the volume in litres or {\dm}^3 of {\N}_2 evolved at S.T.P.

ICSE Class 10 Chemistry 2015 Solved Paper - Question 62

Consider the following reaction and based on the reaction answer the questions that follow :

( {\NH}_4) _2 {\Cr}_2 {\O}_7 \ {─────▸}↖{\;\text " heat "\;} {\N}_2( {\g})+4 {\H}_2 {\O}( {\g})+ {\Cr}_2 {\O}_3

Calculate:

Question : 62 of 85

Marks: +1, -0

the volume in litres or

{\dm}^3

{\N}_2

evolved at S.T.P.

Solution:

252 {\gm}

( {\NH}_4) _2 {\Cr}_2 {\O}_7

release

22.4 l

{\N}_2

at STP
Then

63 {\gm}

( {\NH}_4) _2 {\Cr}_2 {\O}_7

release

=\;{22 .4}/{252} × 63=5 . 6 l

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