1
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 9th April Morning Slot

Identify the correct trend given below : (Atomic No.=Ti : 22, Cr : 24 and Mo : 42)
A
$$\Delta $$o of [Cr(H2O)6]2+ >

[Mo(H2O)6]2+ and

$$\Delta $$o of [Ti(H2O)6]3+ > [Ti(H2O)6]2+
B
$$\Delta $$o of [Cr(H2O)6]2+ >

[Mo(H2O)6]2+ and

$$\Delta $$o of [Ti(H2O)6]3+ < [Ti(H2O)6]2+
C
$$\Delta $$o of [Cr(H2O)6]2+

< [Mo(H2O)6]2+ and

$$\Delta $$o of [Ti(H2O)6]3+ > [Ti(H2O)6]2+
D
$$\Delta $$o of [Cr(H2O)6]2+

< [Mo(H2O)6]2+ and

$$\Delta $$o of [Ti(H2O)6]3+ < [Ti(H2O)6]2+
2
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 9th April Morning Slot

Which one of the following complexes will consume more equivalents of aqueous solution of Ag(NO3) ?
A
Na3[CrCl6]
B
[Cr(H2O)5Cl]Cl2
C
[Cr(H2O)6]Cl3
D
Na2[CrCl5(H2O)]
3
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 10th April Morning Slot

Which of the following is an example of homoleptic complex ?
A
[Co(NH3)6]Cl3
B
[Pt(NH3)2Cl2]
C
[Co(NH3)4Cl2]
D
[Co(NH3)5Cl]Cl2
4
MCQ (Single Correct Answer)

JEE Main 2017 (Offline)

On treatment of 100 mL of 0.1 M solution of CoCl3. 6H2O with excess AgNO3; 1.2 $$\times$$ 1022 ions are precipitated. The complex is:
A
[Co(H2O)3Cl3].3H2O
B
[Co(H2O)6]Cl3
C
[Co(H2O)5Cl]Cl2.H2O
D
[Co(H2O)4Cl2]Cl.2H2O

Explanation

Moles of complex = $${{Molarity \times Volume\left( {mL} \right)} \over {1000}}$$

= $${{100 \times 0.1} \over {1000}}$$ = 0.01 mole

Moles of ions precipitated with excess of AgNO3

= $${{1.2 \times {{10}^{22}}} \over {6.023 \times {{10}^{23}}}}$$ = 0.02 mole

So 0.01 × n = 0.02

$$ \Rightarrow $$ n = 2

It means 2Cl ions present in ionization sphere.

$$ \therefore $$ The formula of complex is [Co(H2O)5Cl]Cl2.H2O

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