#### 12th Standard Chemistry Coordination Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

12th Standard

Reg.No. :
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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
20 x 1 = 20
1. An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be

(a)

0.02

(b)

0.002

(c)

0.01

(d)

0.2

2. IUPAC name of the complex K3[Al(C2O4)3] is

(a)

potassiumtrioxalatoaluminium(III)

(b)

tassiumtrioxalatoaluminate(II)

(c)

potassiumtrisoxalatoaluminate(III)

(d)

potassiumtrioxalatoaluminate(III)

3. Crystal field stabilization energy for high spin d5 octahedral complex is

(a)

-0.6$\triangle$

(b)

0

(c)

2(P-${ \Delta }_{ 0 }$)

(d)

2(P+${ \Delta }_{ 0 }$)

4. Which one of the following will give a pair of enantiomorphs?

(a)

[Cr(NH3)6][Co(CN)6]

(b)

[Co(en)2Cl2]cl

(c)

[pt(NH3)4][ptcl4]

(d)

[Co(NH3)4Cl2]NO2

5. How many geometrical isomers are possible for<<EVA035.eps>>?

(a)

3

(b)

4

(c)

0

(d)

15

6. Which kind of isomerism is possible for a complex [Co(NH3)4Br2]CI

(a)

geometrical and ionization

(b)

geometrical and optical

(c)

optical and ionization

(d)

geometrical only

7. A complex in which the oxidation number of the metal is zero is

(a)

K4[fe(CN)6]

(b)

[Fe(CN)3(NH3)5]

(c)

[Fe(CO)5]

(d)

both (b) and (c)

8. Which of the following is paramagnetic in nature?

(a)

[Zn(NH3)4]2+

(b)

[Co(NH3)6]3+

(c)

[Ni(H2O)6]2+

(d)

[Ni(CN)4]2-

9. Choose the correct statement

(a)

Square planar complexes are more stable than octahedral complexes

(b)

The spin only magnetic moment of [Cu(Cl)4]2- is BM and it has square planar structure.

(c)

Crystal field splitting energy $\left( { \Delta }_{ 0 } \right)$ [FeF6]4- is higher than the $(\Delta _{ 0 })$ $[Fe(CN)6]{ { 4 }^{ - } }$

(d)

crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field stabilization of [Ti(H2O)6]2+

10. An aqueous solution of (PdCI)2 4NH3, when treated with excess of AgNO3 precipitated 2 moles of AgCI. Predict the secondary valency of the compound.

(a)

2

(b)

3

(c)

4

(d)

6

11. Primary and secondary valencies of Cu in [Cu(NH3)4]SO4 is

(a)

4,4

(b)

2,4

(c)

4,1

(d)

4,2

12. Which of the following octahedral complexes do not show geometrical isomerism?

(a)

[Co(NH3)3Cl3]

(b)

[PtCl2(NH3)4]

(c)

[Pt(NH3)2Cl2]

(d)

[Co(en)3]3+

13. According to CFT, five d-orbitals of an octahedral complex split to give

(a)

One orbital with lower energy and four orbitals with higher energy

(b)

Two orbitals wi.t:h lower energy and three orbitals with higher energy

(c)

Three orbitals with lower energy and two orbitals with higher energy

(d)

Four orbitals with lower energy and one orbital with higher energy.

14. Which of the following is correct statement?

(a)

[Ti(H2O)6]3+ is coloured complex

(b)

[Sc(H2O)6]3+ is colourless complex

(c)

d-d transition is not possible in [Sc(H2O)6]3+ complex

(d)

All of these

15. Ligand which is used to treat hard water

(a)

NH3

(b)

Ox

(c)

en

(d)

EDTA

16. Which of these statements about [Co(CN)6]3- is true?

(a)

[CO(CN)6]3- has four unpaired electrons and will be in a high spin configuration

(b)

[Co(CN)6]3- has four unpaired electrons and will be in a low spin configuration

(c)

[CO(CN)6]3- has no unpaired electrons and will be in a high spin configuration

(d)

[CO(CN)6]3- has no unpaired electrons and will be in low spin configuration

17. In Co-ordination compound. [Cr(en)3][CrF6

(a)

ligand is en (ethylenediamine)

(b)

Oxidation state of central atom is +3

(c)

Central metal is Cr (in anomie comples)

(d)

Cation complex is [Co(NH3)4Cl2]+

18. Predict the geometry and hybridisation of Fe(Co)5

(a)

Trigonal planar, dsp3

(b)

Trigonal bipyramidal, dsp3

(c)

Square planar dsp2

(d)

Octahedral d2sp3

19. Which of the following will exhibit linkage isomerism? :

(a)

[Co(NH3)5 (NO2)]2+

(b)

[Co(H2O)5CO)]3+

(c)

[Fe(en)2CI2]+

(d)

all the above

20. An example of a complex compound having coordination number 4

(a)

K4[Fe(CN)6]

(b)

[Co(en)3]Cl

(c)

[Fe(H2O)6]Cl3

(d)

[Cu(NH3)4]Cl2