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Science · 2024 · 2 marks
CBSE 2024 · Region 4 · Set 1 · Q21
(a) 1 gram of solid sodium chloride was taken in a clean and dry test tube and concentrated sulphuric acid was added to it. (i) Name the gas evolved…
$\displaystyle 1$ gram of solid sodium chloride was taken in a clean and dry test tube and concentrated sulphuric acid was added to it.
(i)
Name the gas evolved in the reaction.
(ii)
What will be observed when this gas is tested with (I) dry, and (II) wet blue litmus paper ? Write your conclusion about the nature (acidic/basic) of this gas.
Some metals react with acids to produce salt and hydrogen gas. Illustrate it with an example. How will you test the presence of this gas?
Marking-scheme solution
(a)(i)
$\displaystyle \cdot \mathrm{HCl}$ gas was evolved
(ii)(I)
No change in colour
(II)
Wet blue litmus turns red
HCl gas is acidic in nature
OR
(b)
$\displaystyle \cdot \mathrm{Zn}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{ZnSO}_{4}+\mathrm{H}_{2(\mathrm{~g})}$
Hydrogen burns with a pop sound when a burning matchstick is brought near it.
All Acids, Bases and Salts questions2024 question paperNCERT solutions: Acids, Bases and SaltsPractice Acids, Bases and Salts →
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.