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Science · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q28
Write the electron-dot structures of (i) sodium, and (ii) oxygen. Using these structures, show the formation of sodium oxide. Mark the anion and…
Write the electron-dot structures of (i) sodium, and (ii) oxygen. Using these structures, show the formation of sodium oxide. Mark the anion and cation present in this compound. (At. No. - Sodium $\displaystyle =11$ and Oxygen = $\displaystyle 8$)
Marking-scheme solution
Na O
$\displaystyle 2$, $\displaystyle 8$, $\displaystyle 1$ $\displaystyle 2$, $\displaystyle 6$
(i) . Na
(ii) 
Formation of sodium oxide \(\displaystyle \mathrm{Na}_{2} \mathrm{O}\)
Anion: \(\displaystyle \mathbf{0}^{\mathbf{2}-}\) Cation: \(\displaystyle \mathbf{N a}^{+}\)All Metals and Non-metals questions2025 question paperNCERT solutions: Metals and Non-metalsPractice Metals and Non-metals →
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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.