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Science · 2023 · 3 marks
CBSE 2023 · Region 6 · Set 1 · Q30
With the help of an appropriate example, justify that some of the chemical reactions are determined by (a) Change in temperature, (b) Evolution of a…
With the help of an appropriate example, justify that some of the chemical reactions are determined by
(a)
Change in temperature,
(b)
Evolution of a gas, and
(c)
Change in colour Give chemical equation for the reaction involved in each case.
Marking-scheme solution
(a) \(\displaystyle \mathrm{CaO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}+\) Heat
(b) \[\mathrm{Zn}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{ZnSO}_{4}+\mathrm{H}_{2}(\mathrm{~g})^{\uparrow}
\]
(c) \[\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O} \xrightarrow{\text { heat }} \mathrm{CuSO}_{4}+5 \mathrm{H}_{2} \mathrm{O}
\] (Blue) (White)
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.