Which of the following oxidation states is the most common among

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Which of the following does not exist?

  • KI + I2 → KI3

  • KF + F2 → KF3

  • KBr + ICI2 → K[BrICl]

  • KF + BrF3 → K[BrF4]


42.

Which of the following does not represent the correct order of the property indicated?

  • Sc3+ > Cr3+ > Fe3+ >Mn3+ - ionic radii

  • Sc < Ti < Cr < Mn - density

  • Mn2+ >Ni2+ > Co2+ <Fe2+ - ionic radii

  • FeO < CaO < MnO < CuO - basic nature


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43.

Which of the following oxidation states is the most common among the lanthanoids?

  • 4

  • 2

  • 3

  • 5


C.

3

The most common oxidation state exhibited by lanthanoids is +3.

(The most common and stable oxidation state of Lanthanides is +3.It is attained by removing outermost 2 electrons of 6s electrons and 1 electron from 4f electrons. It is due to high energy difference in 4f and 6s, it is difficult to remove more electrons from 4f sub-shell).


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44.

Mn2O7 dissolves in water to give an acid. The colour of the acid is

  • green

  • blue

  • purple

  • red


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45. '925 fine silver' means an alloy of
  • 7.5% Ag and 92.5% Cu

  • 92.5% Ag and 7.5% Cu

  • 80% Ag and 20% Cu

  • 90% Ag and 10% Cu


46.

Assertion (A): Cu2+ and Cd2+ are separated by first adding KCN solution and then passing H-S gas.
Reason (R): KCN reduces Cu2+ to Cu+ and forms a complex with it.
The correct answer is

  • Both (A) and (R) are true and (R) is the correct explanation of (A)

  • Both (A) and (R) are true but (R) is not the correct explanation of (A)

  • (A) is true but (R) is not true

  • (A) is not true but (R) is true


47.

The effective atomic number of cobalt in the complex [Co(NH3)6]+ is

  • 36

  • 24

  • 33

  • 30


48.

The correct formula of the complex tetraammineaquachlorocobalt (III) chloride is

  • [Cl(H2O)(NH3)4Co]Cl

  • [CoCl(H2O)(NH3)4]Cl

  • [Co(NH3)4(H2O)Cl]Cl

  • [CoCl(H2O)(NH3)4]Cl2


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49.

Across the lanthanide series, the basicity of the lanthanide hydroxides

  • increases

  • decreases

  • first increases and then decreases

  • first decreases and then increases


50.

Sterling silver is

  • AgNO3

  • Ag2S

  • Alloy of 80% Ag+ 20% Cu

  • AgCl


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