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Q.

The following are some statements about Mendeleeff's periodic table

i) It is based on increasing order of atomic numbers

ii) Mendeleeff corrected the atomic weight of some elements like Be, In etc

iii) (Ar; K), (Co; Ni), (Te; I) are three inverted pairs

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a

i & iii are correct

b

iii is correct

c

ii & iii are correct

d

all are correct

answer is B.

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Detailed Solution

(i) is incorrect because Mendeleev's periodic table is based on the increasing order of atomic weights. It follows the periodic law which states that the physical and chemical properties of various elements are a periodic function of their atomic weights.

Mendeleev corrected the atomic weight of some elements like Beryllium, Indium, Aurum, Platinum, etc based on their position in the periodic table. Hence, statement (ii) is correct.

(Ar; K), (Co; Ni), and (Te; I) are three inverted pairs according to Mendeleev's periodic table. Hence statement (iii) is correct.

Therefore, Option B is the correct answer.

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The following are some statements about Mendeleeff's periodic tablei) It is based on increasing order of atomic numbersii) Mendeleeff corrected the atomic weight of some elements like Be, In etciii) (Ar; K), (Co; Ni), (Te; I) are three inverted pairs