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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 dissolving potassium hydroxide in water.(iii)Care must be taken while diluting concentrated nitric acid with water. Why?
(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 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.