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Science · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 2 · Q26
Answer the following: 3 × 1=3 (a) Why can the oxides of highly reactive metals not be reduced by carbon? (b) Why do ionic compounds have high melting…
Answer the following : $\displaystyle 3 \times 1=3$
(a)
Why can the oxides of highly reactive metals not be reduced by carbon ?
(b)
Why do ionic compounds have high melting and boiling points ?
(c)
Why is a solder, an alloy of lead and tin, used for welding electrical wires together ?
Marking-scheme solution
(a) Highly reactive metals have more affinity for oxygen than carbon.
(b) Because a considerable amount of energy is required to break the strong inter-ionic attraction /Because of strong forces of attraction between oppositely charged ions.
(c) Because of its low melting point.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.