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1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?
A
In acidic solutions protons coordinate with ammonia molecules forming $$NH^+_4$$ ions and NH3 molecules are not available
B
In alkaline solutions insoluble Cu(OH)2 is precipitated which is soluble in excess of any alkali
C
Copper hydroxide is an amphoteric substance
D
In acidic solutions hydration protects copper ions.
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Change Language
One mole of the complex compound Co(NH3)5Cl3, gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO3 solution to yield two moles of AgCl (s). The structure of the complex is :
A
[Co(NH3)3Cl3]. 2NH3
B
[Co(NH3)4Cl2] Cl. NH3
C
[Co(NH3)4Cl] Cl2. NH3
D
[Co(NH3)5Cl] Cl2
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Change Language
In the coordination compound, K4[Ni(CN)4], the oxidation state of nickel is :
A
0
B
+1
C
+2
D
-1
4
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
The most stable ion is :
A
[Fe(OH)3]3-
B
[Fe(Cl)6]3-
C
[Fe(CN)6]3-
D
[Fe(H2O)6]3+
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