CBSE 2025 · Region 3 · Set 1 · Q28 · 3 marks
Common salt is an important raw material for various chemicals of daily use. State in brief the method of preparation of(i)Sodium hydroxide, and (ii) Sodium hydrogen carbonate from common salt. Write balanced chemical equations of the reactions that occur.Design an experimental set-up to demonstrate that "Alcohol and glucose contain hydrogen but are not categorised as acids". Also give the reason to justify this fact.
Common salt is an important raw material for various chemicals of daily use. State in brief the method of preparation of
(i)
Sodium hydroxide, and (ii) Sodium hydrogen carbonate from common salt. Write balanced chemical equations of the reactions that occur.
Design an experimental set-up to demonstrate that "Alcohol and glucose contain hydrogen but are not categorised as acids". Also give the reason to justify this fact.
Marking-scheme solution
(a) (i) Electricity is passed through an aqueous solution of NaCl (brine), it decomposes to form NaOH. / Chlor-Alkali Process
\[2 \mathrm{NaCl}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{Cl}_{2}+\mathrm{H}_{2}
\]
(ii) When brine reacts with carbon dioxide and ammonia, sodium hydrogen carbonate and ammonium chloride are formed
\[2 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}+\mathrm{NH}_{3} \longrightarrow \mathrm{NaHCO}_{3}+\mathrm{NH}_{4} \mathrm{Cl}
\]
(b) 
Bulb does not glow when solution of alcohol and glucose are taken but glows when acids solution are taken.
Reason:Acidic solutions liberate ions but glucose and alcohol do not liberate ions .Hence bulb only glows for acidic solutions.Acids, Bases and SaltsChemicals from Common SaltApplyshort_answermedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.