Statement I: Aqueous solution of K 2 Cr 2 O 7 is preferred as primary standard in volumetric analysis over Na 2 Cr 2 O 7 aqueous solution. Statement II: K 2 Cr 2 O 7 has a higher solubility in water than Na 2 Cr 2 O 7 . [2023]

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Q.
Given below are two statements:

Statement I: Aqueous solution of $K_{2} {Cr}_{2} O_{7}$ is preferred as primary standard in volumetric analysis over ${Na}_{2} {Cr}_{2} O_{7}$ aqueous solution.

Statement II: $K_{2} {Cr}_{2} O_{7}$ has a higher solubility in water than ${Na}_{2} {Cr}_{2} O_{7}$ .

In the light of the above statements, choose the correct answer from the options given below: [2023]

1 Statement I is true but Statement II is false.

2 Both Statement I and Statement II are false.

3 Both Statement I and Statement II are true.

4 Statement I is false but Statement II is true.

Ans.
(1)

(I) Potassium dichromate is used as a primary standard in volumetric analysis.

(II) $K_{2} {Cr}_{2} O_{7}$ is less soluble in water than ${Na}_{2} {Cr}_{2} O_{7}$ . Sodium salt has a greater solubility in water and is extensively used as an oxidising agent in organic chemistry.

Solution

1 Statement I is true but Statement II is false.

2 Both Statement I and Statement II are false.

3 Both Statement I and Statement II are true.

4 Statement I is false but Statement II is true.

Ans.
(1)

(I) Potassium dichromate is used as a primary standard in volumetric analysis.

(II) $K_{2} {Cr}_{2} O_{7}$ is less soluble in water than ${Na}_{2} {Cr}_{2} O_{7}$ . Sodium salt has a greater solubility in water and is extensively used as an oxidising agent in organic chemistry.

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Solution

1 Statement I is true but Statement II is false.

2 Both Statement I and Statement II are false.

3 Both Statement I and Statement II are true.

4 Statement I is false but Statement II is true.

Ans. (1) (I) Potassium dichromate is used as a primary standard in volumetric analysis. (II) K2Cr2O7 is less soluble in water than Na2Cr2O7. Sodium salt has a greater solubility in water and is extensively used as an oxidising agent in organic chemistry.

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Ans.
(1)

(I) Potassium dichromate is used as a primary standard in volumetric analysis.

(II) $K_{2} {Cr}_{2} O_{7}$ is less soluble in water than ${Na}_{2} {Cr}_{2} O_{7}$ . Sodium salt has a greater solubility in water and is extensively used as an oxidising agent in organic chemistry.