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The coagulating power of clcctrolytcs ha...

The coagulating power of clcctrolytcs having inos `Na ^(+), Al ^(3+) and Ba ^(2+)` for arsenic culphide sol increase in the order :

A

`Al ^(2+) lt Ba ^(2_ lt Na ^(+) `

B

`Na ^(+) lt Ba ^(2+) lt Al ^(3+)`

C

`Ba ^(2+) lt Na ^(+) lt Al ^(3+)`

D

`Al ^(3+) lt Na ^(+) lt Ba ^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
B
`As _(2) S_(3)` is a negatively charged sol. Therefore coagulating power is proportional to valency of active (positive) ion (Hardy-Schulz rule).
`therefore Al ^(3+) gt Ba^(2+) gt Na ^(+)`
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