Plus Two / 12th Chemistry - Book Back Answers - Unit 5 - English Medium
Tamil Nadu Board 12th Standard Chemistry - Unit 5: Book Back Answers and Solutions
This post covers the book back answers and solutions for Unit 5 from the Tamil Nadu State Board 12th Standard Chemistry textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Unit 5 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
I. Multiple Choice Questions
1. The sum of primary valence and secondary valence of the metal M in the
complex [M(en)2(Ox)]Cl is
a) 3
b) 6
c) -3
d) 9
Answer Key:
d) 9
2. 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
Answer Key:
b) 0.002
3. A complex has a molecular formula MSO4Cl. 6H2O.The
aqueous solution of it gives white precipitate with Barium chloride solution
and no precipitate is obtained when it is treated with silver nitrate solution.
If the secondary valence of the metal is six, which one of the following
correctly represents the complex?
a) [M(H2O)4Cl]SO4.2H2O
b) [M(H2O)6]SO4
c) [M(H2O)5Cl]SO4.H2O
d) [M(H2O)3Cl]SO4.3H2O
Answer Key:
c) [M(H2O)5Cl]SO4.H2O
4. Oxidation state of Iron and the charge on the ligand NO in [Fe(H2O)5NO]SO4
are
a) +2 and 0 respectively
b) +3 and 0 respectively
c) +3 and -1 respectively
d) +1 and +1 respectively
Answer Key:
d) +1 and +1 respectively
5. As per IUPAC guidelines, the name of the complex [Co(en)2(ONO)Cl]Cl
is
a) Chlorobisethylenediaminenitritocobalt(III) chloride
b) Chloridobis(ethane-1,2-diamine)nitro κ -Ocobaltate(III) chloride
c) Chloridobis(ethane-1,2-diammine)nitrito κ -Ocobalt(II) chloride
d) Chloridobis(ethane-1,2-diammine)nitrito κ -Ocobalt(III)chloride
Answer Key:
d) Chloridobis(ethane-1,2-diammine)nitrito κ -Ocobalt(III)chloride
6. IUPAC name of the complex K3[Al(C2O4)3]
is
a) Potassiumtrioxalatoaluminium(III)
b) Potassiumtrioxalatoaluminate(II)
c) Potassiumtrisoxalatoaluminate(III)
d) Potassiumtrioxalatoaluminate(III)
Answer Key:
d) Potassiumtrioxalatoaluminate(III)
7. A magnetic moment of 1.73BM will be shown by one among the following
a) TiCl4
b) [CoCl6]4−
c) [Cu (NH3)4 ]2+
d) [Ni (CN4)]2-
Answer Key:
c) [Cu (NH3)4 ]2+
8. Crystal field stabilization energy for high spin d5 octahedral
complex is
a) −0.6 Δ0
b) 0
c) 2(P- Δ0)
d) 2(P+ Δ0)
Answer Key:
b) 0
9. In which of the following coordination entities the magnitude of Δ0
will be maximum?
a) [Co(CN)6]3-
b) [Co(C2O4)3]3-
c) [Pt(NH3)4][PtCl4]
d) [C0(NH3)6]3+
Answer Key:
a) [Co(CN)6]3-
10. 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
Answer Key:
b) [Co(en)2Cl2]Cl
11. Which type of isomerism is exhibited by [Pt(NH3)2Cl2]?
a) Coordination isomerism
b) Linkage isomerism
c) Optical isomerism
d) Geometrical isomerism
Answer Key:
d) Geometrical isomerism
12. How many geometrical isomers are possible for [Pt(Py)(NH3)(Br)(Cl)]?
a) 3
b) 4
c) 0
d) 15
Answer Key:
a) 3
13. Which one of the following pairs represents linkage isomers?
a) [Cu(NH3)4][PtCl4] and [Pt(NH3)4][CuCl4]
b) [Co(NH3)5(NO3)]SO4 and
[CO(NH3)5(ONO)]
c) [Co(NH3)4(NCS)2]Cl and [Co(NH3)4(SCN)2]Cl
d) both (b) and (c)
Answer Key:
c) [Co(NH3)4(NCS)2]Cl and [Co(NH3)4(SCN)2]Cl
14. Which kind of isomerism is possible for a complex [Co(NH3)4Br2]Cl?
a) geometrical and ionization
b) geometrical and optical
c) optical and ionization
d) geometrical only
Answer Key:
a) geometrical and ionization
15. Which one of the following complexes is not expected to exhibit isomerism?
a) [Ni(NH3)4(H2O)2]2+
b) [Pt(NH3)2Cl2]
c) [Co(NH3)5SO4]Cl
d) [FeCl6]3-
Answer Key:
d) [FeCl6]3-
16. A complex in which the oxidation number of the metal is zero is
a) K4[Fe(CN)6]
b) [Fe(CN)3(NH3)3]
c) [Fe(CO)5]
d) both (b) and (c)
Answer Key:
c) [Fe(CO)5]
17. Formula of tris(ethane-1,2-diamine)iron(II)phosphate
a) [Fe(CH3-CH(NH2)2)3](PO4)3
b)[Fe(H2N-CH2-CH2-NH2)3](PO4)
c) [Fe(H2N-CH2-CH2-NH2)3](
PO4)2
d) [Fe(H2N-CH2-CH2-NH2)3]3(
PO4)2
Answer Key:
d) [Fe(H2N-CH2-CH2-NH2)3]3(
PO4)2
18. 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-
Answer Key:
c) [Ni(H2O)6]2+
19. Fac-mer isomerism is shown by
a) [Co(en)3]3+
b) [Co(NH3)4(Cl)2]+
c) [Co(NH3)3(Cl)3]
d) [Co(NH3)5Cl]SO4
Answer Key:
c) [Co(NH3)3(Cl)3]
20. 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 1.732 BM and it has square planar structure.
c) Crystal field splitting energy (Δ0) of [FeF6]4− is higher than the (Δ0) of [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+
Answer Key:
d) crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field
stabilization of [Ti(H2O)6]2+
II. Short Answer Questions.
12th Chemistry
III. Long Answer Questions.
12th ChemistryIV. Exercise.
12th Chemistry
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