1.

Potassium chromate is isomorphous to potassium sulphate (K_(2)SO_(4)). It is found to contain 26*78 % chromium. Calculate the atomic mass of chromium (K = 39*10).

Answer»

`58`
`52`
`48`
`49`

Solution :Since the forumula of potassium sulphate is `K_(2)SO_(4)` so the FORMULA of potassium chromate is `K_(2)CrO_(4)`(`:'` it is isomorphous to `K_(2)SO_(4)`). Let atomic MASS of chromium be A, then formula mass of potassium chromate should be
`= 2xx39.1+A+64 = 142.2 +A`
Percentage of`Cr = (A)/(142.2+A)xx100`
`26.78 = (A)/(142.2+A)xx100`
On solving, A = 52.00


Discussion

No Comment Found

Related InterviewSolutions