Coordination

JEE Mains 2015 Help › Inorganic Chemistry questions › Coordination

1)A 0.01M complex of CoCl₂ & NH₃ (molar ratio 1:4) is found to have effective molarity of 0.02M (evaluated frm colligative property).
What is the formula of the complex ?
A) [Co(NH₃)₄]Cl₃
B) [Co(NH₃)₄Cl₂]Cl
C) [Co(NH₃)₅Cl]Cl
D) [Co(NH₃)₃Cl₃]

2) MULTIPLE ANSWER
CuSO₄ reacts with KCN to form-
A) Cu(CN)₂ B) CuCN
C) K₂[Cu(CN)₄] D) K₃[Cu(CN)₄]

#Chemistry #Inorganic Chemistry

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6 Answers

24

eureka123 ·2010-01-28 09:01:11

2)
2 CuSO4 + 4 KCN â†’ (CN)²+ 2 CuCN + 2 K2SO4
cyanogen

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13

Avik ·2010-01-28 09:58:50

k thnx eure... :)

Q1 still left...

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106

Asish Mahapatra ·2010-01-28 20:26:09

1. (b) ?

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Avik ·2010-01-28 21:39:50

Yep, sahi hai....but kaise ?

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106

Asish Mahapatra ·2010-01-29 01:16:14

effective molarity is found to be twice that of molarity taken
=> that the molecule must dissociate into two substances (ions)

hence (b) (c) may be correct

but then Q mentions that CoCl2 : NH3 = 1:4 (so (b)) ignoring the outer Cl (disturbing the ratio)

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Avik ·2010-01-30 11:03:06

Ohk, so tht molar ratio meant this.

Thnx asish [1]

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