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Science · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 2 · Q7
The molecular formulae of two alkynes, A and B are C_x H_2 and C_3 H_y respectively. (a) Find the values of x and y. (b) Write the names of A and B.…
The molecular formulae of two alkynes, A and B are $\displaystyle \mathrm{C}_{\mathrm{x}} \mathrm{H}_{2}$ and $\displaystyle \mathrm{C}_{3} \mathrm{H}_{\mathrm{y}}$ respectively.
(a)
Find the values of x and y .
(b)
Write the names of A and B. \[\frac{1}{2} \times 4=2 \]
Marking-scheme solution
(a) • x is $\displaystyle 2$
y is $\displaystyle 4$
(b)
• \(\displaystyle A\) is Ethyne
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.