NEETChemistryd and f Block Elements
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:
Options
- AStatement I is false but Statement II is true
- BBoth Statement I and Statement II are true
- CStatement I is true but Statement II is false
- DBoth Statement I and Statement II are false
Correct answer
C. Statement I is true but Statement II is false
Step-by-step solution
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.