Question

In which of the following, both normality and molarity are equal? I. H3PO2 II. H3PO3 III. KOH IV. NaCl

Answer 1

Answer:

I, III and IV

Explanation:

I is a monobasic acid with valency factor 1.

II is a dibasic acid with valency factor 2.

III is a monoacidic base with valency factor 1.

IV is an electrolyte where valency factor is 1.

As, I, III and IV have valency factors of 1, their normality and molarity will be equal.

Answer 2

The one which has both equal normality and molarity is Nacl

There are some which expresses equal and unequal  molarity and normality are

Hcl

    Hcl has molarity  1.0M HCl  and normality 1.0N HCl

HNO3

    1.0M HNO3 = 1.0N HNO3

H2SO4

   H2SO4 has molarity 1.0M H2SO4 and normality  2.0N H2SO4

H3PO4

    H3PO4 has molarity 1.0M H3PO4and normality 3.0N H3PO4

NaCl

   Nacl has molarity 1.0M NaCl and normality 1.0N NaCl

Na2SO4

   Na2so4 has molarity 1.0M Na2SO4 and normality 2.0N Na2SO4

Na3PO4

  Na3Po4 has molarity 1.0M Na3PO4 and normality 3.0N Na3PO4 etc.

These are some which has equal normality and Molarity .

Considering the other options,

We have  H3PO2 , H3PO3 ,  KOH.

All these do not have equal normality and molarity

The correct option is Nacl which has equal normality and molarity

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