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Science · 2024 · 2 marks
CBSE 2024 · Region 5 · Set 1 · Q21
(a) Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its colour. Write the chemical equation for…
(a)
Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its colour. Write the chemical equation for the reaction involved.
OR
(b)
Write chemical equation for the chemical reaction which occurs when the aqueous solutions of barium chloride and sodium sulphate react together. Write the symbols of the ions present in the compound precipitated in the reaction.
Marking-scheme solution
(a) • Copper Oxide
Black
\(\displaystyle 2 \mathrm{Cu}+\mathrm{O}_{2} \xrightarrow{\text { Heat }} 2 \mathrm{CuO}\)
OR
(b) \(\displaystyle \mathrm{BaCl}_{2}(\mathrm{aq})+\mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{BaSO}_{4}(\mathrm{~s})+2 \mathrm{NaCl}(\mathrm{aq})\)
\(\displaystyle \mathrm{Ba}^{2+}, \mathrm{SO}_{4}{ }^{2-}\)
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.