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Science · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 3 · Q25
Show the formation of NaCl by transfer of electrons. Why does solid NaCl not conduct electricity ? [Atomic number : $\displaystyle \mathrm{Na}=11, \mathrm{Cl}=17$ ]
Marking-scheme solution
\(\displaystyle \mathrm{Na} \rightarrow \mathrm{Na}^{-}+\mathrm{e}^{-}\) $\displaystyle 2,8.1$ $\displaystyle 2,8$ (Sodium cation)
Because the movement of ions in solid NaCl is not possible due to its rigid structure.
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.