ICSE Class 10 Chemistry 2015 Solved Paper

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 : 63 of 85

Marks: +1, -0

the mass of grams of

{\Cr}_2 {\O}_3

formed at the same time.

Solution:

252 {\gm}

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

produces

152 {\gm}

{\Cr}_2 {\O}_3

.
Then

63 {\gm}

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

produces

=\;{152}/{252} × 63=38 {\gm}

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