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Q.

Based on the group valency of elements, the following is the molecular formula of the compound formed when an element, A of group 2 combines with an element, B of group sixteen.

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a

H 2 O, L i 2 O, K 2 O

, etc.

b

B C l 3, A l C l 3

etc.

c

M g O, C a O

etc.

d

C O 2, S i O 2

etc.

answer is C.

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Detailed Solution

Concept: The ability of atoms or molecules to combine is measured by their valency. The ability of an atom of one element to interact and combine with a specific number of atoms of another element is what is meant by this definition.
Over time, the periodic table's valency first rises and then falls. Going down a group does not bring about change. The polarizability of species is higher and the ionisation energy is lower for elements that are lower in a group for this reason.
The valency of group 2 is

+ 2

and the valency of group 16 is

− 2

. So, the compound formed is MX. For example:

M g O, C a O

etc.
Hence, the correct answer is option 3.

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Based on the group valency of elements, the following is the molecular formula of the compound formed when an element, A of group 2 combines with an element, B of group sixteen.