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a
p→ iv; q→ ii; r→ iii; s→ i
b
p→ i; q→ ii; r→ iii; s→ iv
c
p→ iv; q→ ii; r→ i; s→ ii
d
p→ iv; q→ iii; r→ ii; s→ i
answer is D.
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Detailed Solution
15th group elements are known as pnicogens16th group elements are known as chalcogens17th group elements are known as halogens 18th group elements are known as inertgases