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Science · 2023 · 3 marks
CBSE 2023 · Region 5 · Set 2 · Q32
(a) How is a universal indicator better than litmus solution? (b) State two features of pH scale. (c) Why should we not add water to a concentrated…
(a)
How is a universal indicator better than litmus solution ?
(b)
State two features of pH scale.
(c)
Why should we not add water to a concentrated acid ?
Marking-scheme solution
(a) Universal Indicator gives a wide range of colours of acids and bases whereas Litmus solution only one colour change. / Universal indicator gives the strength of acids/bases, Litmus does not.
(b)
(i) Its range is $\displaystyle 0$ to $\displaystyle 14$ .
(ii) It measures hydrogen ion concentration in a solution.
(iii) as \(\displaystyle \mathrm{H}^{+}\)concentration decreases pH increases and vice versa
(c) If water is added to concentrated acid, the heat generated may cause the mixture to splash out and cause burns / excess heat is generated.
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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.