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ICSE Class 10 Chemistry Question 19 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 18

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18
Question

Question 7(ii)

Give reason for the following:

(a) Ionisation potential decreases down a group.

(b) Ionic compounds do not conduct electricity in solid state.

Answer

(a) On moving down the group, atomic size, as well as, nuclear charge increases. However, the effect of increase in atomic size dominates over the effect of increase in nuclear charge. Hence, ionization potential decreases down the group.

(b) There is a strong electrostatic force of attraction between the oppositely charged ions of the ionic compounds that keeps ions in fixed position in solid state. Due to this immobility of ions, ionic compounds do not conduct electricity in solid state.