Q.

In the complex, CoCl3. 4NH3, the primary valency of the central metal is satisfied by

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a

Two chloride ions

b

Two chloride ions and four ammonia molecules

c

Three chloride ions

d

One chloride ion

answer is C.

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Detailed Solution

According to Werner's theory, primary valency of a metal is satisfied by negative ions only.Werner formula …CoCl3. 4NH3Modern formula . . .Co(NH3)4Cl2ClTwo chloride ions satisfy both primary and secondary valency. One chloride ion satisfies only primary valency.
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In the complex, CoCl3. 4NH3, the primary valency of the central metal is satisfied by