Given below are two statements: Statement I : Aqueous solution of K 2 Cr 2 O 7 is preferred as a primary standard in volumetric analysis over Na 2 Cr 2 O 7 aqueous solution. Statement II : K 2 Cr 2 O

Question

Given below are two statements:

Statement I : Aqueous solution of $K_{2} {Cr}_{2} O_{7}$ is preferred as a 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:

TestHub · Accepted Answer

K 2 Cr 2 O 7 is generally preferred than Na 2 Cr 2 O 7 in volumetric analysis as Na 2 Cr 2 O 7 is hygroscopic in nature, therefore it is difficult to prepare its standard solution for volumetric analysis as accurate weighing is not possible in normal atmospheric conditions. A hygroscopic substance can absorb moisture from the atmosphere due to which there will be inaccuracy in weight.

Chemistry - Complete d-block Question with Solution | TestHub

Options:

Doubts & Discussion