Chapter 8 d- and f-Block Elements MCQs
Q 1.: The magnetic moment of Ni+2 ion (At. No. 28) in B.M. unit is
(A) 1.73
(B) 2.84
(C) 3.86
(D) 4.81
Option – B
Q 2.: Metal ion responsible for minimata disease is
(A) Co+2
(B) Cu+2
(C) Hg+2
(D) Ni+2
Option – C
Q 3.: Which of the following statement about interstitial compounds is incorrect ?
(A) They retain metallic conductivity
(B) They are chemically reactive
(C) They are much harder than the pure metal
(D) They have higher melting point than the pure metal
Option – B
Q 4.: Which of the following elements is not considered to be a transition element ?
(A) Cu
(B) Ni
(C) Mo
(D) Hg
Option – D
Q 5.: The aqueous solution of which of the following ions is green coloured ?
(A) Co+2
(B) Zn+2
(C) Ni+2
(D) Cr+2
Option – C
Q 6.: Which one of the following transition metal ions is colourless in aqueous solutions ?
(A) Ti+4
(B) V+4
(C) Fe+3
(D) Cu+2
Option – A
Q 7.: Select the most stable oxidation state of Iron (Fe)
(A) +2
(B) +3
(C) +4
(D) +5
Option – B
Q 8.: Which of the following compounds of transition elements is used in dry cell ?
(A) K2Cr2O7
(B) KMnO4
(C) Cr2O3
(D) MnO2
Option – D
Q 9.: Transition elements does not show
(A) Paramagnetic
(B) Colour
(C) Fixed valency
(D) Catalytic activity
Option – C
Q 10.: Which of the following statements is not true ?
(A) On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed
(B) Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
(C) K2Cr2O7 solution in acidic medium is orange
(D) K2Cr2O7 solution becomes yellow on increasing the pH beyond 7
Option – A
Q 11.: Which of the following elements is radioactive ?
(A) Praseodymium (Pr)
(B) Promethium (Pm)
(C) Gadolinium (Gd)
(D) Thulium (Tm)
Option – B
Q 12.: What is the general electronic configuration of actinide series ?
(A) [Xe] 4f0–14 5d0–1 6s2
(B) [Xe] 4f0–14 5d0–10 6s2
(C) [Rn] 5f0–14 5d0–2 6s2
(D) [Rn] 5f0–14 6d0–2 7s2
Option – D
Q 13.: What is main quantum number of extreme outermost orbit of first transition elements ?
(A) 3
(B) 4
(C) 5
(D) 6
Option – B
Q 14.: Which one of the following does not correctly represent the correct order of the property indicated against it ?
(A) Ti < V < Cr < Mn increasing number of oxidation states
(B) Ti+3 < V+3 < Cr+3 < Mn+3 increasing magnetic moment
(C) Ti < V < Cr > Mn increasing melting points
(D) Ti < V < Cr < Mn increasing 2nd ionisation enthalpy
Option – C
Q 15.: The number of water molecules in Mohr’s salt
(A) 6
(B) 12
(C) 18
(D) 24
Option – A
Q 16.: Cupric compounds are more stable than their cuprous counter parts in solid state. This is because
(A) The endothermic characteristics of the 2nd ionisation enthalpy of Cu is not so high
(B) Size of Cu+2 is less than Cu+1
(C) Cu+2 has stable electronic configuration as compared to Cu+2
(D) The lattice energy released for cupric compounds is much higher than Cu+1
Option – D
Q 17.: The percentage of carbon in soft iron is
(A) Less than 0.2%
(B) 0.2% – 0.3%
(C) 0.3% – 0.6%
(D) 0.6% – 0.8%
Option – B
Q 18.: What is the percentage of Cr in stainless steel ?
(A) 8%
(B) 18%
(C) 20%
(D) 32%
Option – C
Q 19.: The oxidation state of chromium in the final product formed by the reaction between KI and acidified K2Cr2O7 solution is
(A) +3
(B) +4
(C) +2
(D) +6
Option – A
Q 20.: Which alloy is used in filling in the cavity of the tooth ?
(A) German silver
(B) Cupro-nickel
(C) Nitinol
(D) Mercury amalgam
Option – D
Q 21.: Which metal from the following is used in production of atomic energy ?
(A) Uranium
(B) Plutonium
(C) Thorium
(D) All of the above
Option – D
Q 22.: Transition metals show paramagnetic behaviour. This is because of
(A) High lattice energy
(B) Variable oxidation state
(C) Unpaired electrons
(D) Large number of empty orbitals in valence shell
Option – C
Q 23.: Maximum oxidation state possessed by actinide is
(A) +4
(B) +5
(C) +6
(D) +7
Option – D
Q 24.: Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of
(A) Cr2(SO3)3
(B) Cr2(SO4)3
(C) Cr2O3
(D) CrSO4
Option – B
Q 25.: What is the oxidation state of vanadium in vanadates ?
(A) +3
(B) +4
(C) +5
(D) +6
Option – C
Q 26.: Which of the following elements can show maximum oxidation states ?
(A) Mn
(B) Cr
(C) Cu
(D) Co
Option – A
Q 27.: Select the most stable oxidation state of Vanadium
(A) +2
(B) +3
(C) +4
(D) +6
Option – C
Q 28.: When dilute H2SO4 is added to aqueous solution of potassium chromate, yellow colour of solution turns to orange colour. It indicates
(A) Chromate ions are reduced
(B) Chromate ions are oxidised
(C) Monocentric complex converted into dicentric complex
(D) Oxygen gets removed from chromate ions
Option – B
Q 29.: Select the Mn-compound that has the most stable oxidation state.
(A) KMnO4
(B) K2MnO4
(C) Mn2O3
(D) MnO
Option – D
Q 30.: Ammonia will not form coordination complex with
(A) Ag+2
(B) Pb+2
(C) Cu+2
(D) Cd+2
Option – B
Q 31.: Which of the following transition elements has maximum unpaired electrons ?
(A) Cr
(B) Mn
(C) Fe
(D) Cu
Option – A
Q 32.: For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order ?
(A) Cr > Mn > Co > Fe
(B) Fe > Mn > Co > Cr
(C) Mn > Fe > Cr > Co
(D) Co > Mn > Fe > Cr
Option – C
Q 33.: Calculate the number of d-electrons is [Cr(H2O)6]+3. (At. No. of Cr is 24)
(A) 2
(B) 3
(C) 4
(D) 0
Option – B
Q 34.: Which of the following pairs has the same size ?
(A) Zn+2 , Hf+4
(B) Fe+2 , Ni+2
(C) Zr+4 , Ti+4
(D) Zr+4 , Hf+4
Option – D
Q 35.: Which of the following is a coloured compound ?
(A) Ag2SO4
(B) CuF2
(C) MgF2
(D) CuCl
Option – B
Q 36.: Which of the following ions gives colourless aqueous solution ?
(A) Cu+1
(B) Cu+2
(C) Fe+2
(D) Ni+2
Option – A
Q 37.: When Zn is treated with excess of NaOH, the product obtained is
(A) Na2ZnO2
(B) Zn(OH)2
(C) ZnO
(D) None of these
Option – A
Q 38.: For which of the following pairs, magnetic moment is same ?
(A) MnCl2 , CuSO4
(B) TiO2 , CuSO4
(C) CuCl2 , TiCl3
(D) TiCl3 , NiCl2
Option – C
Q 39.: In copper how many electrons have spin in one direction and in other direction ? (At. No. 29)
(A) 13 electrons have spin in one direction and 16 electrons in other direction
(B) One electron can have spin only in the clockwise direction
(C) 12 electrons have spin in one direction and 17 electrons in other direction
(D) 14 electrons have spin in one direction and 15 electrons in other direction
Option – D
Q 40.: Lanthanoid contraction is due to increase in
(A) atomic number
(B) effective nuclear charge
(C) atomic radius
(D) valence electrons
Option – B