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Coordination Compounds Quiz-13

Dear Readers,

JEE Advanced is a high level exam that checks your concept by putting various types of questions. The questions are in a different format from JEE mains, herein the questions are : single correct multiple choice questions, multiple correct multiple choice questions, statement based questions and comprehension type questions..

Q1. 
The complex [Fe(H_2 O)_5 NO]^(2+) is formed in the brown ring test nitrates when freshly prepared FeSO_4 solution is added to aqueous solution of NO_3^- followed by addition of conc. H_2 SO_4 Select correct statement about this complex
  •  Colour change is due to charge transfer
  •  It has iron in +1 oxidate state and nitrosyl as NO^+
  •  It has magnetic moment of 3.87 BM confirming three unpaired electrons in Fe
  •  All the above are correct statements
Solution
(d)

Q2. 
Optical isomers are
1. enantiomers
2. non-superimposable
3. have the property of chirality
4. form racemic mixture if present in 1:1 ratio
Select the correct alternate
  •  I,II, Iv are correct
  •  I,II III are correct
  •  All are correct
  •  All are incorrect
Solution
(c)

Q3. In the ring compounds formed by bidentate ligands ,on binding to a metal or metal ions, are called
  •  Ligands
  •  Chelates
  •  Chelates
  •  Ambident
Solution
(b)


Q4. Select the correct statement
  •  Geometrical isomer may differ in dipole moment and visible/UV spectra
  •  Complexes of the type [Ma_3 b_3]can also have facial (fac) and meridional (mer) isomer
  •  No optical isomer exists for the complex trans-[Co(en)_2 Cl_2 ]^+
  •  All the above are correct statements
Solution
(d)

Q5.
Statement 1: The IUPAC name for the compound, NCCH_2 CH_2 COOH is 3-cyano propanoic acid
Statement 2: -COOH is considered as substituent group while –CN is considered as the principal functional group
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(c)
-COOH is the principal group while –CN is the substituent group


Q6. 
Statement 1: CH_3-CH(Cl)OH is a optically active compound
Statement 2: Dissymetry arises in a chemical compound owing to the presence of chiral centre
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  • Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(a) In chiral centre, chiral axis and chiral plane, if any one is present, the molecule will be optically active

Q7.
Statement 1: F- ion is weak ligand and forms outer orbital complex.
Statement 2: F- ion can not force the electrons of d z2 and d x2-y2 orbitals to occupy dxy dyz and dzx orbitals of the same shell.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(a) F^- ion is weak field ligand and it forms outer orbital complex as it cannot force the electrons to pair up.

Q8.
Statement 1: Highly charged cations are expected to form most strongly acidic hydrated cations
Statement 2: The acidity of a hydrated metal ion depends on the strength of the bond between cation and oxygen
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(b) Trivalent cations, as a group are more acidic than divalent cations and most monovalent cations have negligible acidic character When cation-oxygen bond is strong, the bond between oxygen and hydrogen is weakened and the proton can be donated to a base

Q9.
Statement 1: A compound whose molecule has D configuration will always be dextrorotatory
Statement 2: Compounds having D configuration may be dextrorotatory or levorotatory
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(d) The configuration in a compound is independent of its physical properties like optical activity

Q10. 
Statement 1: The IUPAC name of the CH_3-CH=CH-C≡CH is pent-3-en-1-yne and not pent-2-ene-4-yne
Statement 2: Lowest locant rule for multiple bond is preferred

  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  • Statement 1 is False, Statement 2 is True
Solution
(a) If however, there is a choice in numbering, the double bond is always given preference over the triple bond

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Coordination Compounds Quiz 13
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