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Science · 2023 · 3 marks
CBSE 2023 · Region 4 · Set 2 · Q32
(i) Why is acidified water considered to be a good conductor of electricity? (ii) Write a chemical equation showing the ionic products formed on…
(i)
Why is acidified water considered to be a good conductor of electricity?
(ii)
Write a chemical equation showing the ionic products formed on dissolving potassium hydroxide in water.
(iii)
Care must be taken while diluting concentrated nitric acid with water. Why?
Marking-scheme solution
(i) Acidified water has more ions than pure water.
(ii) \(\displaystyle \mathrm{KOH}(\mathrm{s}) \xrightarrow{\mathrm{H}_{2} \mathrm{O}} \mathrm{K}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})\)
(iii) The process is highly exothermic / may cause excessive heating /heat is released and may cause harm / mixture may splash out
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.