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Q.

Which of the following shows periodic variations?

(I) Energy of atomization

(VI) Atomic radii

(II) Boiling points

(VII) Ionisation enthalpy

(III) Melting point

(VIII)Electronegativity

(IV) Heat of fusion

(V) Heat of vaporisation

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a

I, II, III, IV, and V only

b

VI, VII and VIII only

c

I, II, III, IV, V, VI, VII and VIII

d

II, III, VI and VII only

answer is C.

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Detailed Solution

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Change in atomic size,  atomic weight and electronic configuration will cause variations of these properties 

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