Relation between normality and molarity is given by the formula

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$n = N×M$

$N = n(M)$

$M = n(N)$

All

answer is B.

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Detailed Solution

N = n(M)

To understand the relation between normality and molarity, it's essential to grasp the definitions of both terms:

Molarity (M): Defined as the number of moles of solute per liter of solution. It indicates the concentration of a solution in terms of the amount of substance present.
Normality (N): Defined as the number of gram equivalent weights of solute per liter of solution. It reflects the concentration of reactive units in a solution.

The relationship between normality and molarity is given by the formula:

N = M × n

Where:

N is the normality of the solution.
M is the molarity of the solution.
n is the number of equivalents, which depends on the specific reaction the solute undergoes.

For instance:

In acid-base reactions, n corresponds to the number of hydrogen ions (H⁺) an acid can donate or the number of hydroxide ions (OH⁻) a base can accept. For example, sulfuric acid (H₂SO₄) can donate two H⁺ ions, so for H₂SO₄, n = 2.
In redox reactions, n represents the number of electrons transferred per molecule of solute.

Therefore, the formula N = M × n accurately describes the relation between normality and molarity.