ICSE Class 10 Chemistry 2018 Solved Paper

Aluminum carbide reacts with water according to the following equation :

{\Al}_4 {\C}_3+12 {\H}_2 {\O} → 4 {\Al}( {\OH})_3+3 {\CH}_4

[Relative molecular weight of

{\Al}_4 {\C}_3=144

;

{\Al}( {\OH})_3=78]

Question : 56 of 80

Marks: +1, -0

What mass of aluminum hydroxide is formed from

12 {\g}

of aluminum carbide?

Solution:

\table {\Al}_4 {\C}_3,+,12 {\H}_2 {\O} ,→,\;4 {\Al} ( {\OH}_3) ,+,3 {\CH}_4 ;144 {\gm},,,,4 × 78 {\gm},,3 × 22.4

144 {\gm} {\Al}_4 {\C}_3

forms

312 {\gm}

{\Al}( {\OH})_3

then

12 {\gm}

{\Al}_4 {\C}_3

forms

\;{4 × 78}/{144} × 12

=26 {\gm}

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