CBSE 2025 · Region 6 · Set 1 · Q28 · 3 marks
State the chemical property in each case on which the following uses of baking soda are based upon :(i)as an anti-acids(ii)as a constituent in making baking powder(iii)in soda-acid fire-extinguishersWrite chemical equations to show what happens when an acid reacts with a(i)metal(ii)base and(iii)carbonate Write the name of the main product formed in each case.
State the chemical property in each case on which the following uses of baking soda are based upon :
(i)
as an anti-acids
(ii)
as a constituent in making baking powder
(iii)
in soda-acid fire-extinguishers
Write chemical equations to show what happens when an acid reacts with a
(i)
metal
(ii)
base and
(iii)
carbonate Write the name of the main product formed in each case.
Marking-scheme solution
(a) (i) Baking soda is used as an antacid because it is a mild noncorrosive basic salt hence neutralises excess acid.
(ii) Baking soda liberates carbon dioxide \(\displaystyle \left(\mathrm{CO}_{2}\right)\) gas on reaction with mild edible acid.
(iii)In fire extinguishers, it acts as a base to react with acid to produce carbon dioxide \(\displaystyle \left(\mathrm{CO}_{2}\right)\) gas to extinguish fire.
OR
(b)(i) \(\displaystyle \mathrm{Zn}+2 \mathrm{HCl} \longrightarrow \mathrm{ZnCl}_{2}+\mathrm{H}_{2}\) Metal Acid Zinc chloride
(ii) \(\displaystyle 2 \mathrm{NaOH}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O}\) Base Acid Sodium Sulphate
(iii) \(\displaystyle \mathrm{Na}_{2} \mathrm{CO}_{3}+2 \mathrm{HCl} \longrightarrow 2 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}\) Salt Acid Sodium chloride (Give marks if written with carbonate ion)
Acids, Bases and SaltsChemical Properties of Acids and BasesUnderstandshort_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.