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Q.

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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a

p i; q iv; r ii; s iii

b

p iv; q i; r iii; s ii

c

p iv; q i; r ii; s iii

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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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