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Potassium selenate is isomorphous with p...

Potassium selenate is isomorphous with potassium sulphate and contains `50.0%` of `Se`. The atomic weight of `Se` is
a. `142`, b. `71`, c. `47.33`, d. `284`

A

142

B

71

C

47.33

D

284

Text Solution

Verified by Experts

The correct Answer is:
A
`K_(2)SO_(4)` and `K_(2)SeO_(4)` are isomorphous. `K_(2)SeO_(4) rArr 39 xx 2 + x + 64 = 142 + x`
`(142 + x)g` of `K_(2) SeO_(4) rArr xg` of Se , 100 g `K_(2)SeO_(4) rArr (x)/(142 + x) xx 100`
`:. (x)/(142+x) xx 100 = 50 :. x = 142`
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