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Science · 2025 · 5 marks
CBSE 2025 · Region 1 · Set 3 · Q36
(a) (i) Draw electron dot structure of chlorine molecule. ( Atomic Number of Chlorine =17) (ii) What happens when chlorine reacts with methane in the…
(i)
Draw electron dot structure of chlorine molecule. $\displaystyle ($ Atomic Number of Chlorine $\displaystyle =17)$
(ii)
What happens when chlorine reacts with methane in the presence of sunlight ? Write the name of the reaction.
(iii)
Name the two oxidising agents used for the conversion of alcohols to acids.
(iv)
List four differences in properties between covalent compounds and ionic compounds.
(i)
Give reason why carbon forms compounds mainly by covalent bonding.
(ii)
Why do covalent compounds have low melting and boiling points.
(iii)
Give reason for the following : I. Covalent compounds are bad conductors of electricity. II. Carbon shows catenation.
Marking-scheme solution
\(\displaystyle \frac{1}{2}, \frac{1}{2}\)
lose four electrons forming \(\displaystyle \mathrm{C}^{4+}\) cation. But it would require a large amount of energy to remove four electrons leaving behind a carbon cation with six protons in its nucleus.
∴ It shares four electrons of the outermost shell to form covalent bond/covalent compound.
(ii)
There are weak forces of attraction between the molecules of covalent compound.
(iii)
(I)
Covalent compounds do not form ions hence are poor conductors.
(II)
Carbon-carbon single bond is very strong and stable.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.