Among the electrolytes ` Na, SO_4 , CaCl_4 , Al_2(SO_4)_3` and ` NH_4 Cl`, the most effective coagualting agent for ` Sb_2 S_3` sol is :
A
`Na_2SO_4`
B
`CaCl_2`
C
`Al_2 (SO_4)_3`
D
`NH_4Cl`
Text Solution
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The correct Answer is:
c
The most effective coagulating agent for `Sb_2 s_3` sol is `Al_2 (SO_4)_3` due to higher charge density on cation . `(Hardy- Schulze rule )` `Al^2 gt Ca^(2+)gt Na^+ gt NH_4^+`.
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