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 Multiple Choice QuestionsMultiple Choice Questions

1.

The pair in which phosphorous atoms have a formal oxidation state of +3 is:

  • Pyrophosphorous and hypophosphoric acids

  • Orthophosphorous and hypophosphoric acids

  • Pyrophosphorous and pyrophosphoric acids

  • Pyrophosphorous and pyrophosphoric acids

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2.

Which among the following is the most reactive?

  • Cl2

  • Br2

  • I2

  • I2

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3.

Match the catalysis to the correct processes.

Catalyst Process
(A)TiCl3 (i) Wacker Process
(B) PdCl2 (ii) Ziegler -Natta
(C) CuCl2 (iii) Contact process
(D) V2O5 (iv)Deacon's process
  • (A)- (iii), (B)-(ii), (C)-iv, (D)- (i)

  • (A) - (ii), (B) - (i), (C) -(iv), (D) - (iii)

  • (A)- (ii), (B)- (iii), (C)- (iv), (D) - (i)

  • (A)- (ii), (B)- (iii), (C)- (iv), (D) - (i)

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4.

The equation which is balanced and represents the correct product(s) is

  • Li2O + 2KCl → 2LiCl + K2O

  • [COCl(NH3)5]+ + 5H+ → Co2+

  • [Mg(H2O)6]2+ + (EDTA)4- rightwards arrow with Excess space NaOH space space on top [Mg(EDTA)]2+ + 6H2O

  • [Mg(H2O)6]2+ + (EDTA)4- rightwards arrow with Excess space NaOH space space on top [Mg(EDTA)]2+ + 6H2O

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5.

Which of the following arrangements does not represent the correct order of the property stated against it?

  • V2+ < Cr2+<Mn2+<Fe2+: paramagnetic behaviour

  • Ni2+ < Co2+ < Fe2+ < Mn2+ ; Ionic size

  • Co3+ < Fe3+< Cr3+ < Sc3+ : stability in aqueous solution

  • Co3+ < Fe3+< Cr3+ < Sc3+ : stability in aqueous solution

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6.

Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?

  • Ferrous oxide is more basic in nature than the ferric oxide.

  • Ferrous compounds are relatively more ionic than the corresponding ferric compounds.

  • Ferrous compounds are less volatile than the corresponding ferric compounds.

  • Ferrous compounds are less volatile than the corresponding ferric compounds.

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7.

The correct order of E°M2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is

  • Cr > Mn > Fe > Co

  • Mn > Cr > Fe > Co

  • Cr > Fe > Mn > Co

  • Cr > Fe > Mn > Co

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8.

Sodium salt of an organic acid 'X' produces effervescence with conc. H2SO4. 'X' reacts with the acidified aqueous CaCl2 solution to give a white precipitate which decolourises acidic solution of KMnO4. 'X' is

  • C6H5COONa

  • HCOONa

  • Na2C2O4

  • Na2C2O4

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9.

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements in incorrect

  • The ionic sizes of Ln (III) decrease in general with increasing atomic number.

  • Ln (III) compounds are generally colourless.

  • Because of the large size of the Ln (III) ions, the bonding in its compounds is predominantly ionic in character

  • Because of the large size of the Ln (III) ions, the bonding in its compounds is predominantly ionic in character

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10.

In context with the transition elements, which of the following statements is incorrect?

  • In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.

  • In the highest oxidation states, the transition metal shows basic character and form cationic complexes.

  • In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.

  • In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.

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