MCQs of d- and f- Block Elements

Showing 61 to 70 out of 158 Questions

61.

From the following electronic configurations, in which configuration will the atom have the highest oxidation state ?

62.

Which of the following elements has 11 electrons in its M shell ?

63.

Copper gives stable compounds in +2 oxidation state only because _____ .

(a)	copper is a transition metal in +2 oxidation state
(b)	compounds with Cu²⁺ state are formed by exothermic reactions
(c)	electronic configuration of Cu in +2 state is [Ar]3d⁹ 4s⁰
(d)	copper gives coloured compounds in +2 state.

64.

Select the one which has oxidation state +6.

65.

Select the correct order of stability for +2 oxidation state in Cr (Z = 24), Mn (Z = 25), Fe (Z = 26) and Co (Z = 27).

66.

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

(a)	V²⁺ < Cr²⁺ < Mn²⁺ < Fe²⁺ : Paramegnetic behavior
(b)	Ni²⁺ < Co²⁺ < Fe ²⁺ < Mn²⁺ : Ionic size
(c)	Co³⁺ < Fe³⁺ < Cr³⁺ < Sc³⁺ : Stability in aqueous solution
(d)	Sc < Ti < Cr < Mn : Number of oxidation states

67.

Which of the following alloys does not contain zinc ?

(a)	Brass
(b)	German silver
(c)	Bronze
(d)	The mixture used in filling cavity in the tooth

68.

Which element from the following is a transition element according to its electronic configuration of ground state ?

69.

Which of the following possesses the highest second ionization enthalpy ?

70.

Which of the following atoms has the highest first ionization energy ?

Showing 61 to 70 out of 158 Questions