Coordination Compounds Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

How many moles of \( \ce{AgCl} \) precipitate when 1 mole of \( \ce{[Co(H2O)4Cl2]Cl} \) reacts with excess \( \ce{AgNO3} \)?

In \( \ce{[Co(H2O)4Cl2]Cl} \), the 1 \( \ce{Cl^-} \) outside the coordination sphere is ionizable and forms \( \ce{AgCl} \), while the 2 inside are ligands. Thus, 1 mole precipitates.

1
2
3
0
1

What is the coordination number of copper in \( \ce{[Cu(en)2]^2+} \)?

In \( \ce{[Cu(en)2]^2+} \), each ethane-1,2-diamine (en) is bidentate, contributing 2 donor atoms. Total = 2 × 2 = 4.

4
6
5
3
1

What is the IUPAC name of \( \ce{[Cr(H2O)4(SCN)2]Cl} \)?

Ligands: aqua (\( \ce{H2O} \)), thiocyanato (\( \ce{SCN} \)), alphabetically ordered. Cr is +3 (balancing 2 \( \ce{SCN^-} \) and 1 \( \ce{Cl^-} \)). Name: tetraaquabis(thiocyanato)chromium(III) chloride.

Tetraaquabis(thiocyanato)chromium(III) chloride
Bis(thiocyanato)tetraaquachromium(II) chloride
Tetraaquathiocyanatochromium(III) dichloride
Tetraaquabis(thiocyanato)chromate(III) chloride
1

What is the IUPAC name of \( \ce{[Co(NH3)3Cl3]} \)?

Ligands: ammine (\( \ce{NH3} \)), chlorido (\( \ce{Cl} \)), alphabetically ordered. Neutral complex, Co is +3 (3 \( \ce{Cl^-} \) balanced by Co). Name: triamminetrichloridocobalt(III).

Triamminetrichloridocobalt(III)
Trichloridotriamminecobalt(II)
Triamminetrichloridocobalt(IV)
Trichloridotriamminecobalt(III)
1

The number of geometrical isomers for \( \ce{[Pt(NH3)2Cl2]} \) is:

\( \ce{[Pt(NH3)2Cl2]} \) (square planar, \( \ce{[Ma2b2]} \)) exhibits 2 geometrical isomers: cis (adjacent ligands) and trans (opposite ligands).

1
3
2
4
3

What is the IUPAC name of \( \ce{[Mn(H2O)4Cl2]} \)?

Ligands: aqua (\( \ce{H2O} \)), chlorido (\( \ce{Cl} \)), alphabetically ordered. Mn is +2 (neutral complex, 2 \( \ce{Cl^-} \)). Name: tetraaquadichloridomanganese(II).

Tetraaquadichloridomanganese(II)
Dichloridotetraaquamanganese(III)
Tetraaquamanganese(II) dichloride
Tetraaquadichloridomanganese(IV)
1

What is the oxidation state of iron in \( \ce{[Fe(H2O)4Cl2]} \)?

In \( \ce{[Fe(H2O)4Cl2]} \), \( \ce{H2O} \) is neutral, each \( \ce{Cl^-} \) is -1. The complex is neutral, so \( x + 0 + 2(-1) = 0 \), \( x = +2 \).

+2
+3
+1
+4
1

Which complex has the most unpaired electrons when the metal is in a +2 oxidation state in an octahedral field with weak field ligands?

\( \ce{[Mn(H2O)6]^2+} \) (Mn\(^{2+}\), \( d^5 \)) with weak field \( \ce{H2O} \) is high spin (\( t_{2g}^3 e_g^2 \)), 5 unpaired electrons, the maximum among options.

\( \ce{[Fe(H2O)6]^2+} \)
\( \ce{[Ni(H2O)6]^2+} \)
\( \ce{[Mn(H2O)6]^2+} \)
\( \ce{[Co(H2O)6]^2+} \)
3

How many water molecules act as ligands in \( \ce{[Fe(H2O)5Cl]SO4} \)?

In \( \ce{[Fe(H2O)5Cl]SO4} \), the coordination sphere \( \ce{[Fe(H2O)5Cl]^+} \) contains 5 \( \ce{H2O} \) molecules as ligands.

5
6
4
3
1

Which complex results in 2 moles of precipitate when treated with excess \( \ce{BaCl2} \) per mole of compound?

\( \ce{[Co(NH3)4Cl2]2SO4} \) has 2 \( \ce{SO4^2-} \) counter ions, each forming \( \ce{BaSO4} \) with \( \ce{BaCl2} \), yielding 2 moles of precipitate.

\( \ce{[Co(NH3)4Cl2]2SO4} \)
\( \ce{[Co(NH3)6]Cl3} \)
\( \ce{[Fe(H2O)6]SO4} \)
\( \ce{[Ni(NH3)4]Cl2} \)
1

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