ICSE Class 10 Chemistry 2023 Solved Paper

SECTION - I

Choose the correct answers to the questions from the given options.

Question : 9 of 88

Marks: +1, -0

The nitrate which on thermal decomposition leaves behind a residue which is yellow when hot and white when cold:

Solution:

(d) Zinc nitrate
Explanation:

\;2 {\Zn} ( {\NO}_3) _2 \ {─────▸}↖ {∆} \;{{2 {\ZnO}}}↙{{{{\;\text " Pale yellow Hot"\; } }}}

+4 {\NO}_2 ↑ \;+ {\O}_2 ↑

On cooling it changes to white due to formation of zinc nitrate hexahydrate.

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