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Question

The equivalent weight of K2CrO4, when it reacts with AgNO3 to give Ag2CrO4 is _______.


A

M

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B

M2

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C

M3

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D

Infinite

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Solution

The correct option is B

M2


Explanation for correct option:

B. M2

Step 1: Equivalent mass:

  • Equivalent mass is equal to the molecular/atomic mass divided by the number of electrons involved in the reaction per molecule/atom/ion.
  • It is expressed as:

Equivalentweight=AtomicweightValency

Step 2: Reaction of Potassium chromate and Silver nitrate:

  • When Potassium chromateK2CrO4 reacts with Silver nitrateAgNO3, it produces Silver chromateAg2CrO4 and Potassium nitrateKNO3.
  • The chemical reaction can be depicted as:

K2CrO4(aq)+2AgNO3(aq)→Ag2CrO4(aq)+2KNO3(aq)

Step 3: Calculation of Equivalent mass:

The valency of Potassium in Potassium chromate is 2.

If M is the molecular weight of Potassium chromate, thus the equivalent weight will be:

Equivalentweight=M2

The explanation for incorrect options:

The equivalent weight of K2CrO4 is M2. Thus, options A, C and D are incorrect.

Hence, the correct option is B i.e. the equivalent weight of K2CrO4, when it reacts with AgNO3 to give Ag2CrO4 is M2 .


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