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Q.

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a

p→ iv; q→ i; r→ ii; s→ iii

b

p→ i; q→ iv; r→ ii; s→ iii

c

p→ iv; q→ i; r→ iii; s→ ii

d

p→ i; q→ iv; r→ iii; s→ ii

answer is A.

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Detailed Solution

Dobereiner classification is based on law of triads Newland classification is based on law of octave Chancourtois classification of elements is based on cylindrical table of elements Mendeleev classification of elements is based on increasing  atomic masses which is 1st periodic law
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