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Correct statements about $[C o C l_{2} {(N H_{3})}_{4}] C l$ complex is
i) It is a violet coloured complex
ii) It is 1:1 type of electrolyte
iii) In it primary valency is one and secondary velency is 6
iv) It react with excess of $A g N O_{3}$ to give two moles of $A g C l$ precipitate

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ii and iv only

i and iii only

i and ii only

ii and iii only

answer is A.

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Detailed Solution

$[C o C l_{2} {(N H_{3})}_{4}] c l ....$ primary valency is 3. This complex react with excess of $A g N O_{3} (a q)$ to give one mole of $A g C l$ ppt.

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