The atomic weights of "Be" and "In" were correctly by Mendeleef using for formula

How many of the following statements are correct according to Mendeleef's period table ? (a) Mendeleef corrected the atomic weight of Be, In and Os b) Ar-k, Te-I and Co-Ni are anomalous pairs. c) Atomic weights of elements were corrected by using the relation Atomic Wt. (Eq.Wt) (valency) d) Eka baron is scandium e) Eka silicon is germanium f) Eka aluminium is galium g)This classification is based on valency h) Mendeleef's law is based on atomic weights

A compound of X and Y has equal mass of them. If their atomic weights are 30 and 20 respectively. The molecular formula of compound is :-

Atomic weight of Eka Al predicted by Mendeleef's is' X' and its experimental value is 'Y' then correct order is

During the medial check up of 35 students of a class, their weights were recorded as follows: Draw a less than type ogive for the given data. Hence obtain the median weight from the graph and verify the result by using the formula.

During the medical check-up of 35 students of a class,their weights were recorded as follows: Draw a less than type ogive for the given data.Hence obtain the median weight from the graph and verify the result by using the formula.