MCQ Questions for Class 12 Chemistry with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these The d-and f-Block Elements Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\nThe d-and f-Block Elements Class 12 MCQs Questions with Answers<\/h2>\n
Solving the The d-and f-Block Elements Multiple Choice Questions of Class 12 Chemistry Chapter 8 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on The d-and f-Block Elements Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 8 Chemistry Class 12 and cross-check your answers during preparation.<\/p>\n
Question 1.
\nWhich transition metal can show highest oxidation state?
\n(a) Sc
\n(b) Ti
\n(c) Os
\n(d) In<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Os<\/p>\n<\/details>\n
\nQuestion 2.
\nWhich of the following is not an actinoid?
\n(a) Thorium
\n(b) Californium
\n(c) Uranium
\n(d) Terbium<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) Terbium<\/p>\n<\/details>\n
\nQuestion 3.
\nWhich of the following would be diamagnetic?
\n(a) Cu2+<\/sup>
\n(b) Ni2+<\/sup>
\n(c) Cd2+<\/sup>
\n(d) Ti3+<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Cd2+<\/sup><\/p>\n<\/details>\n
\nQuestion 4.
\nMisch metal is an alloy of
\n(a) La
\n(b) Th
\n(c) Ac
\n(d) none of these<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) La<\/p>\n<\/details>\n
\nQuestion 5.
\nMaximum magnetic moment is shown by
\n(a) 3d8<\/sup>
\n(b) 3d7<\/sup>
\n(c) 3d9<\/sup>
\n(d) 3d5<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) 3d5<\/sup><\/p>\n<\/details>\n
\nQuestion 6.
\nMaximum oxidation number of manganese is in
\n(a) K2<\/sub>MnO4<\/sub>
\n(b) MnO2<\/sub>
\n(c) KMnO4<\/sub>
\n(d) Mn2<\/sub>O4<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) KMnO4<\/sub><\/p>\n<\/details>\n
\nQuestion 7.
\nElectronic configuration of Fez+ ion is
\n(a) [Ar] 4s2<\/sup>3d4<\/sup>
\n(b) [Ar] 4s1<\/sup>3d5<\/sup>
\n(c) [Ar] 3d6<\/sup>
\n(d) [Ar] 3d8<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) [Ar] 3d6<\/sup><\/p>\n<\/details>\n
\nQuestion 8.
\nElectronic configuration of Cr (Z = 24) is
\n(a) 3d4<\/sup> 4s2<\/sup>
\n(b) 3d6<\/sup> 4s0<\/sup>
\n(c) 3d5<\/sup> 4s1<\/sup>
\n(d) none of these<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) 3d5<\/sup> 4s1<\/sup><\/p>\n<\/details>\n
\nQuestion 9.
\nIncreasing order of paramagnetism is
\n(a) Cu2+<\/sup> CO2+<\/sup>, Mn2+<\/sup>, Ni2+<\/sup>
\n(b) CO2+<\/sup>, Cu2+<\/sup>, Mn2+<\/sup>, Ni2+<\/sup>
\n(c) Cu2+<\/sup>, Ni2+<\/sup>, CO2+<\/sup>, Mn2+<\/sup>
\n(d) Mn2+<\/sup>, CO2+<\/sup>, Ni2+<\/sup>, Cu2+<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Cu2+<\/sup>, Ni2+<\/sup>, CO2+<\/sup>, Mn2+<\/sup><\/p>\n<\/details>\n
\nQuestion 10.
\nCopper sulphate dissolves in excess of KCN to give:
\n(a) [CU(CN)4<\/sub>]3-<\/sup>
\n(b) [CU(CN)4<\/sub>]2-<\/sup>
\n(c) CuCN
\n(d) [Cu(CN2<\/sub>].<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) [CU(CN)4<\/sub>]3-<\/sup><\/p>\n<\/details>\n
\nQuestion 11.
\nWhich of the following is not a lanthanoid element?
\n(a) Cerium
\n(b) Europium
\n(c) Lutetium
\n(d) Thorium<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) Thorium<\/p>\n<\/details>\n
\nQuestion 12.
\nWhich is colourless in H2<\/sub>O?
\n(a) Ti3+<\/sup>
\n(b) V3+<\/sup>
\n(c) Cr3+<\/sup>
\n(d) Sc3+<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) Sc3+<\/sup><\/p>\n<\/details>\n
\nQuestion 13.
\nWhich one is coloured?
\n(a) Cu2<\/sub>Cl2<\/sub>
\n(b) [SC(H2<\/sub>O)6<\/sub>]3+<\/sup>
\n(c) [Zn(H2<\/sub>O)6<\/sub>]2+<\/sup>
\n(d) [Ti(H2<\/sub>O)6<\/sub>]3+<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) [Ti(H2<\/sub>O)6<\/sub>]3+<\/sup><\/p>\n<\/details>\n
\nQuestion 14.
\nWhich of the following titanium compounds cannot be prepared? (Atomic No. of Ti = 22)
\n(a) TiO
\n(b) TiO2<\/sub>
\n(c) K2<\/sub>TiO4<\/sub>
\n(d) TiCl2<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) K2<\/sub>TiO4<\/sub><\/p>\n<\/details>\n
\nQuestion 15.
\nElectronic configuration of a transition element X in +3 oxidation state is [Ar]3d5<\/sup>. What is its atomic number?
\n(a) 25
\n(b) 26
\n(c) 27
\n(d) 24<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) 26<\/p>\n<\/details>\n
\nQuestion 16.
\nThe electronic configuration of Cu (II) is 3d9<\/sup> whereas that of Cu (I) is 3d10<\/sup>. Which of the following is correct?
\n(a) Cu (II) is more stable
\n(b) Cu (II) is less stable
\n(c) Cu (I) and Cu (II) are equally stable
\n(d) Stability of Cu (I) and Cu (II) depends on nature of copper salts<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) Cu (II) is more stable<\/p>\n<\/details>\n
\nQuestion 17.
\nMetallic radii of some transition elements are given below.
\nFe – 126
\nCo – 125
\nNi – 125
\nCu – 128
\nWhich of these elements will have highest density?
\n(a) Fe
\n(b) Ni
\n(c) Co
\n(d) Cu<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) Cu<\/p>\n<\/details>\n
\nQuestion 18.
\nGenerally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?
\n(a) Ag2<\/sub> SO4<\/sub>
\n(b) CuF2<\/sub>
\n(c) ZnF2<\/sub>
\n(d) Cu2<\/sub> Cl2<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) CuF2<\/sub><\/p>\n<\/details>\n
\nQuestion 19.
\nOn addition of small amount of KMnO4<\/sub> to concentrated H2<\/sub>SO4<\/sub>, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
\n(a) Mn2<\/sub>O7<\/sub>
\n(b) MnO2<\/sub>
\n(c) MnSO4<\/sub>
\n(d) Mn2<\/sub>O3<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) Mn2<\/sub>O7<\/sub><\/p>\n<\/details>\n
\nQuestion 20.
\nThe magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
\n(a) 3d7<\/sup>
\n(b) 3d5<\/sup>
\n(c) 3d8<\/sup>
\n(d) 3d2<\/sup><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) 3d5<\/sup><\/p>\n<\/details>\n
\nQuestion 21.
\nWhich of the following oxidation state is common for all lanthanoids?
\n(a) +2
\n(b) +3
\n(c) +4
\n(d) +5<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) +3<\/p>\n<\/details>\n
\nQuestion 22.
\nWhich of the following reactions are disproportionation reactions?
\n(i) Cu+<\/sup> \u2192 Cu2+<\/sup> + Cu
\n(ii) 3MnO4<\/sub>2-<\/sup> + 4H+<\/sup> \u2192 2MnO4<\/sub>–<\/sup> + MnO2<\/sub> + 2H2<\/sub>O
\n(iii) 2KMnO4<\/sub> \u2192 K2<\/sub>MnO4<\/sub> + MnO2<\/sub> + O2<\/sub>
\n(iv) 2MnO4<\/sub>–<\/sup> + 3Mn2+<\/sup> + 2H2<\/sub>O \u2192 5MnO2<\/sub> + 4H+<\/sup>
\n(a) i, ii
\n(b) i, ii, iii
\n(c) ii, iii, iv
\n(d) i, iv<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) i, ii<\/p>\n<\/details>\n
\nQuestion 23.
\nWhen KMnO4 <\/sub>solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because
\n(a) CO2<\/sub> is formed as the product
\n(b) Reaction is exothermic
\n(c) MnO4<\/sub>–<\/sup> catalyses the reaction
\n(d) Mn2+<\/sup> acts as autocatalyst<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) Mn2+<\/sup> acts as autocatalyst<\/p>\n<\/details>\n
\nQuestion 24.
\nThere are 14 elements in actinoid series. Which of the following elements does not belong to this series?
\n(a) U
\n(b) Np
\n(c) Tm
\n(d) Fm<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Tm<\/p>\n<\/details>\n
\nQuestion 25.
\nKMnO4<\/sub> acts as an oxidising agent in acidic medium. The number of moles of KMnO4<\/sub> that will be needed to react with one mole of sulphide ions in acidic solution is
\n(a) 2\/5
\n(b) 3\/5
\n(c) 4\/5
\n(d) 1\/5<\/p>\n\nAnswer<\/span><\/summary>\n