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Q.

Among the following the correct points regarding Mendeleev's periodic table is

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a

The elements of 1st column forms formula R2O with Oxygen

b

The elements of 2nd column forms formula RO with Oxygen

c

Elements present in the same group have similar properties due to common valency

d

All

answer is D.

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Detailed Solution

All statements are correct based on criteria of Mendeleev’s classification.
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