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Science · 2023 · 3 marks
CBSE 2023 · Region 4 · Set 1 · Q28
(i) Suggest a safe procedure of diluting a strong concentrated acid. (ii) Name the salt formed when sulphuric acid is added to sodium hydroxide and…
(i)
Suggest a safe procedure of diluting a strong concentrated acid.
(ii)
Name the salt formed when sulphuric acid is added to sodium hydroxide and write its pH.
(iii)
Dry HCl gas does not change the colour of dry blue litmus paper. Why?
Marking-scheme solution
(i) The acid must always be added slowly to water with constant stirring.
(ii) Sodium sulphate / \(\displaystyle \mathrm{Na}_{2} \mathrm{SO}_{4} \mathrm{pH}=7\)
(iii) Dry HCl is unable to ionise
/ Due to absence of hydrogen ion or hydronium ion
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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.