Which of the following statements is(are) correct? (A) Melting points decrease on going down the...

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Which of the following statements is(are) correct?
(A) Melting points decrease on going down the group
(B) Electron affinity, in general, decreases on going down the group
(C) Halogens have the highest values of electron affinity and ionisation energy in their respective periods
(D) Alkali metals have lowest values of ionisation energy in their respective periods.
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