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a
The one group of p-block elements has highly negative electron gain enthalpies
b
The two groups of p-block elements have highly negative electron gain enthalpies
c
Group - 17 elements is known as halogen family
d
Both (b) and (c)
answer is D.
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Detailed Solution
The two groups such as 16th and 17th groups have highly negative electron gain enthalpies, group- 16 elements and 17 elements are known as chalcogens and halogens family respectively.