Chapter 8 d- and f-Block Elements MCQs
Q 41.: By which of the following formulae can the magnetic moment due to spin only be determined ?
(A) \sqrt{n(n+1)}
(B) \sqrt{n(n-2)}
(C) \sqrt{(n+1)^{2}-(1)^{2}}
(D) \sqrt{n(n-1)}
Option – C
Q 42.: Which one of the following is called green vitriol?
(A) FeSO4.7H2O
(B) CuSO4.5H2O
(C) CaSO4.2H2O
(D) None of these
Option – A
Q 43.: Colour of transition metal ions are due to absorption of some wavelength. This results in
(A) s-s transition
(B) p-p transition
(C) d-d transition
(D) s-p transition
Option – C
Q 44.: Which of the following pairs of ions have the same electronic configuration?
(A) Cu+2, Cr+2
(B) Fe+3, Mn+2
(C) Co+3, Ni+3
(D) Sc+3, Cr+3
Option – B
Q 45.: The number of moles of KMnO4 that are needed to react completely with one mole of ferrous oxalate in acidic solution is
(A) 3/5
(B) 2/5
(C) 1/5
(D) 1
Option – A
Q 46.: Which of the following has magnetic moment value of 5.9?
(A) Fe2+
(B) Cu2+
(C) Ni2+
(D) Fe3+
Option – D
Q 47.: Which one of the following characteristics of the transition metals is associated with higher catalytic activity?
(A) High enthalpy of atomisation
(B) Paramagnetic behaviour
(C) Colour of hydrate ions
(D) Variable oxidation states
Option – D
Q 48.: Transition elements form alloys easily because they have
(A) Same atomic number
(B) Same electronic configuration
(C) Nearly same atomic size
(D) None of the above
Option – C
Q 49.: An oxide of manganese possesses magnetic moment equal to 4.9 BM. Determine the oxide
(A) MnO
(B) Mn2O3
(C) MnO2
(D) Mn2O7
Option – B
Q 50.: German silver alloy contains
(A) Zinc, Nickel and Copper
(B) Silver, Copper and Nickel
(C) Zinc, Silver and Copper
(D) Zinc, Aluminium and nickel
Option – A