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Science · 2025 · 2 marks
CBSE 2025 · Region 3 · Set 1 · Q22
(a) Write the formula of the ions which (i) acids, and (ii) bases generate in water solutions. (b) Dry HCl gas does not change the colour of dry…
(a)
Write the formula of the ions which (i) acids, and (ii) bases generate in water solutions.
(b)
Dry HCl gas does not change the colour of dry litmus paper. Why ?
Marking-scheme solution
(a) (i) \(\displaystyle \mathrm{H}^{+} / \mathrm{H}_{3} \mathrm{O}^{+}\)
(ii) \(\displaystyle \mathrm{OH}^{-}\)
(b) Dry HCl does not dissociate into hydrogen ions in absence of water.
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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.