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Science · 2025 · 2 marks
CBSE 2025 · Region 3 · Set 3 · Q22
A chemical compound 'X' is used to bleach washed clothes in laundry as well as to make drinking water free from germs. Identify 'X'. How is this…
A chemical compound 'X' is used to bleach washed clothes in laundry as well as to make drinking water free from germs. Identify 'X'. How is this compound represented ? Write the method of its preparation along with the chemical equation for the reaction that occurs.
Marking-scheme solution
Bleaching powder/Calcium oxychloride
\(\displaystyle \mathrm{CaOCl}_{2}\)
By the action of chlorine on dry slaked lime.
\(\displaystyle \mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \rightarrow \mathrm{CaOCl}_{2}+\mathrm{H}_{2} \mathrm{O}\)
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.