Science>Chemistry>Atom, Molecule and Chemical Reaction>Valency

Valency

IMPORTANT

Valency: Overview

This topic covers concepts such as Valency Used for Some Common Ions and Variable Valency.

Important Questions on Valency

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 1

The valency of sulphite ion is:

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 2

Elements of which block shows variable valency in periodic table?

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 3

What do you mean by variable valency? Write two examples of elements showing variable valency.How can an atom show variable valency?

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 4

Give reasons.

Some elements have variable valencies.

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 5

Which of the following has variable valency?

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 6

Column I	Column II
P. Phosphate	1. ${SO}_{3}^{2 -}$
Q. Sulphite	2. ${SO}_{4}^{2 -}$
R. Sulphate	3. ${PO}_{4}^{3 -}$
S. Carbonate	4. ${CO}_{3}^{2 -}$

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 7

Column I	Column II
P. Chloride ion	1. Divalent, negative
Q. Calcium ion	2. Trivalent, positive
R. Aluminium ion	3. Divalent, positive
S. Oxide ion	4. Monovalent, negative

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 8

The valency of nitrogen in ammonia $({NH}_{3})$ is

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 9

Cotyledons are also called-

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Science>Atom, Molecule and Chemical Reaction>Valency> Q 10

What is the valency of carbonate?