Q71 of 181 Page 306

A metal X is in the first group of the periodic table. What will be the formula of its oxide?

In the first group of the periodic table there is only one electron in the last shell of the elements, hence valency of 1st group element is 1. So they react with oxygen which have valency 2.

The formula will be X2O.


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69

The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?

(i) A and D


(ii) C and D


(iii)A and B


(iv)B and C


(v)A and C

 70

An element X from group 2 reacts with element Y from group 16 of the periodic table.

(a)What is the formula of the compound formed?


(b) What is the nature of bond in the compound formed?

 72

An element A from group 14 of the periodic table combines with an element B from group 16.

(i) What type of chemical bond is formed?


(ii) Give the formula of the compound formed.

 73

An element X from group 2 of the periodic table reacts with an element Y from group 17 to from a compound.

(a) What is the nature of the compound formed.


(b) State whether the compound formed will conduct electricity or not.


(c) Give the formula of the compound formed.


(d) What is the valency of element X?


(e) How many electrons are there in the outermost shell of an atom of element Y?