How many of following may lead to the formation of negatively charge colloid. (i) 50 ml of 0.1 M AgNO 3 + 40 ml of 0.1 M KI (ii) 50 ml of 0.1 M AgNO 3 + 50 ml of 0.1 M KI (iii) 50 ml of 0.1 M AgNO

Question

How many of following may lead to the formation of negatively charge colloid.

(i) 50 ml of $0.1 M AgNO_{3} + 40 ml$ of 0.1 M KI

(ii) 50 ml of $0.1 M AgNO_{3} + 50 ml$ of 0.1 M KI

(iii) 50 ml of $0.1 M AgNO_{3} + 50 ml$ of 0.2 M KI

(iv) 50 ml of $0.1 M CuSO_{4} + 50 ml$ of 0.5 M KI

(v) 50 ml of $0.1 M CuSO_{4} + 50 ml$ of 0.4 M KI

TestHub · Accepted Answer

(iii), (iv) & (v) will lead to formation of negatively charged colloid.

(iv)

$2 CuSO_{4} + 2 KI \to 2 Cu^{+} + I_{2} + K_{2} SO_{4}$

$t = 0$ 5 mmol 25 mmol - - -

t' 0 20 mmol 5 mmol - -

$2 Cu^{+}$ + $2 I^{-} \to$ $Cu_{2} I_{2}$

5 mmol 20 mmol 0

0 15 mmol 2.5 mmol

Negatively charge colloid : $Cu_{2} I_{2} / I_{3}^{-}$ .

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