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Column (I) Column (II)
(p) Dobereiner (i) Law of ocaves
(q) Newlands (ii) Cylindrical table of elements
(r) Chancourtois (iii) 1st periodic law
(s) Mendeleev (iv) Law of triads

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p $\overset{}{\to}$ iv; q $\overset{}{\to}$ i; r $\overset{}{\to}$ ii; s $\overset{}{\to}$ iii

p $\overset{}{\to}$ i; q $\overset{}{\to}$ iv; r $\overset{}{\to}$ ii; s $\overset{}{\to}$ iii

p $\overset{}{\to}$ iv; q $\overset{}{\to}$ i; r $\overset{}{\to}$ iii; s $\overset{}{\to}$ ii

p $\overset{}{\to}$ i; q $\overset{}{\to}$ iv; r $\overset{}{\to}$ iii; s $\overset{}{\to}$ 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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