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Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds4 Marks
Question
Read the passage given below and answer the following questions:
Coordination compounds are formulated and named according to the $\text{IUPAC}$ system.
Few rules for naming coordination compounds are:
  1. In ionic complex, the cation is named first and then the anion.
  2. In the coordination entity, the ligands are named first and then the central metal ion.
  3. When more than one type of ligands are present, they are named in alphabetical order of preference without any consideration of charge.
The following questions are multiple choice questions. Choose the most appropriate answer:
  1. The $\ce{[Pt(NH_3)_3Br(NO_2)Cl]Cl}$ name of the complex $\ce{[Pt(NH_3)_3Br(NO_2)Cl]Cl}$ is:
  1. Triamminechlorobromonitroplatinum $(IV)$ chloride.
  2. Triamminebromonitrochloroplatinum $(IV)$ chloride.
  3. Triamminebromidochloridonitroplatinum $(IV)$ chloride.
  4. Triamminenitrochlorobromoplatinum $(IV)$ chloride.
  1. The $\text{IUPAC}$ name of $\ce{[Ni(CO)_4]}$ is:
  1. Tetracarbonylnickel $(II).$
  2. Tetracarbonylnickel $(0).$
  3. Tetracarbonylnickelate $(II).$
  4. Tetracarbonylnickelate $(0).$
  1. As per $\text{IUPAC}$ nomenclature, the name of the complex $\ce{[Co(H_2O)_4(NH_3)_2]Cl_3}$ is:
  1. Tetraaquadiamminecobalt $(II)$ chloride.
  2. Tetraaquadiamminecobalt $(III)$ chloride.
  3. Diamminetetraaquacobalt $(II)$ chloride.
  4. Diamminetetraaquacobalt $(III)$ chloride.
  1. Which of the following represents correct formula of dichloridobis $($ethane $-1, 2-$diamine$)$ cobalt $(III)$ ion?
  1. $\ce{[CoCl_2(en)]^{2+}}$
  2. $\ce{[CoCl_2(en)_2]^{2+}}$
  3. $\ce{[CoCl_2(en)]^+}$
  4. $\ce{[CoCl_2(en)_2]^+}$
  1. Correct formula of pentaamminenitro$-O-$cobalt $(III)$ sulphate is:
  1. $\ce{[Co(NO_2)(NH_3)_5]SO_4}$
  2. $\ce{[Co(ONO)(NH_3)_5]SO_4}$
  3. $\ce{[Co(NO_2)(NH_3)_4](SO_4)_2}$
  4. $\ce{[Co(ONO)(NH_3)_4](SO_4)_2}$
✓

Answer

  1. $(c)$ Triamminebromidochloridonitroplatinum $(IV)$ chloride
Ligands are named in alphabetical order irrespective of their charge.
  1. $(b)$ Tetracarbonylnickel $(0).$
  2. $(d)$ Diamminetetraaquacobalt $(III)$ chloride.
  3. $(d)\  \ce{[CoCl_2(en)_2]^+}$
  4. $(b)\  \ce{[Co(ONO)(NH_3)_5]SO_4}$
Ligand $\text{NO}_2^-$ is ambidentate ligand as it can donate electrons through either nitrogen $(NO_2)$ or oxygen $\text{(ONO)}.$

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The following questions are multiple choice questions. Choose the most appropriate answer :
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  1. If cathode is a $Hg$ electrode, then the maximum weight of amalgam formed from this solution is :
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  1. In electrolysis of aqueous $\text{NaCl}$ solution when $Pt$ electrode is taken, then which gas is liberated at cathode?
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Read the passage given below and answer the following questions:
The properties of the solutions which depend only on the number of solute particles but not on the nature of the solute are called colligative properties. Relative lowering in vapour pressure is also an example of colligative properties. For an experiment, sugar solution is prepared, for which lowering in vapour pressure was found to be 0.061 mm of Hg. (Vapour pressure of water at 20° C is 17.5 mm of Hg)
The following questions are multiple choice questions. Choose the most appropriate answer:
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$($source: Moore, J. W., Pearson, $R. G. (1981).$ Kinetics and mechanism. John Wiley Sons.$)$
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  3. Sodium benzoate and sodium formate.
  4. Benzyl alcohol and methyl alcohol.
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  2. Trichloromethanol.
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  3. The abstraction of proton from the carboxylic group.
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  2. Wurtz reaction.
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