{"id":19167,"date":"2021-02-22T17:39:32","date_gmt":"2021-02-22T12:09:32","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=19167"},"modified":"2021-02-22T17:39:32","modified_gmt":"2021-02-22T12:09:32","slug":"mcq-questions-for-class-12-chemistry-chapter-8","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-12-chemistry-chapter-8\/","title":{"rendered":"MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements with Answers Pdf free download is available here. 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>\n

The 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>\n

Answer: (c) Os<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) Terbium<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) Cd2+<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (a) La<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) 3d5<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) KMnO4<\/sub><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) [Ar] 3d6<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) 3d5<\/sup> 4s1<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) Cu2+<\/sup>, Ni2+<\/sup>, CO2+<\/sup>, Mn2+<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (a) [CU(CN)4<\/sub>]3-<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) Thorium<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) Sc3+<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) [Ti(H2<\/sub>O)6<\/sub>]3+<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) K2<\/sub>TiO4<\/sub><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (b) 26<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (a) Cu (II) is more stable<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) Cu<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (b) CuF2<\/sub><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (a) Mn2<\/sub>O7<\/sub><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (b) 3d5<\/sup><\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (b) +3<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (a) i, ii<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (d) Mn2+<\/sup> acts as autocatalyst<\/p>\n<\/details>\n

\n

Question 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>\n

Answer: (c) Tm<\/p>\n<\/details>\n

\n

Question 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

Answer: (a) 2\/5<\/p>\n<\/details>\n

\n

Question 26.
\nWhich of the following is amphoteric oxide?
\nMn2<\/sub>O7<\/sub>, CrO3<\/sub>, Cr2<\/sub>O3<\/sub>, CrO, V2<\/sub>O5<\/sub>, V2<\/sub>O4<\/sub>
\n(a) V2<\/sub>O5<\/sub>, Cr2<\/sub>O3<\/sub>
\n(b) Mn2<\/sub>O7<\/sub>, CrO3<\/sub>
\n(c) CrO, V2<\/sub>O5<\/sub>
\n(d) V2<\/sub>O5<\/sub>, V2<\/sub>O4<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) V2<\/sub>O5<\/sub>, Cr2<\/sub>O3<\/sub><\/p>\n<\/details>\n

\n

Question 27.
\nGadolinium belongs to 4f series. Its atomic number is 64.
\nWhich of the following is the correct electronic configuration of gadolinium?
\n(a) [Xe] Af7<\/sup> 5d1<\/sup>6s\u00b2
\n(b) [Xe] 4f6<\/sup> 5d\u00b2 6s\u00b2
\n(c) [Xe] 4f8<\/sup> 6d\u00b2
\n(d) [Xe]4f9<\/sup> 5s1<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) [Xe] Af7<\/sup> 5d1<\/sup>6s\u00b2<\/p>\n<\/details>\n

\n

Question 28.
\nInterstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
\n(a) They have high melting points in comparison to pure metals
\n(b) They are very hard
\n(c) They retain metallic conductivity
\n(d) They are chemically very reactive<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) They are chemically very reactive<\/p>\n<\/details>\n

\n

Question 29.
\nThe magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr3+<\/sup> ion is
\n(a) 2.87 B.M.
\n(b) 3.87 B.M.
\n(c) 3.47 B.M.
\n(d) 3.57 B.M.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 3.87 B.M.<\/p>\n<\/details>\n

\n

Question 30.
\nKMnO4<\/sub> acts as an oxidising agent in alkaline medium.
\nWhen alkaline KMnO4<\/sub> is treated with Kl, iodide ion is oxidised to
\n(a) l2<\/sub>
\n(b) lO–<\/sup>
\n(c) lO3<\/sub>–<\/sup>
\n(d) lO4<\/sub>–<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) lO3<\/sub>–<\/sup><\/p>\n<\/details>\n

\n

Question 31.
\nWhich of the following statements is not correct?
\n(a) Copper liberates hydrogen from acids.
\n(b) In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
\n(c) Mn3+<\/sup> and Co3+<\/sup> are oxidising agents in aqueous solution.
\n(d) Ti2+<\/sup> and Cr2+<\/sup> are reducing agents in aqueous solution.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Copper liberates hydrogen from acids.<\/p>\n<\/details>\n

\n

Question 32.
\nWhen acidified K2<\/sub>Cr2<\/sub>O7<\/sub> solution is added to Sn2+<\/sup> salts then Sn2+<\/sup> changes to
\n(a) Sn
\n(b) Sn3+<\/sup>
\n(c) Sn4+<\/sup>
\n(d) Sn+<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Sn4+<\/sup><\/p>\n<\/details>\n

\n

Question 33.
\nHighest oxidation state of manganese in fluoride is +4 (MnF4<\/sub>) but highest oxidation state in oxides is +7 (Mn2<\/sub>O7<\/sub>) because
\n(a) fluorine is more electronegative than oxygen.
\n(b) fluorine does not possess d-orbitals.
\n(c) fluorine stabilises lower oxidation state.
\n(d) in covalent compounds fluorine can form single bond only while oxygen forms double bond.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) in covalent compounds fluorine can form single bond only while oxygen forms double bond.<\/p>\n<\/details>\n

\n

Question 34.
\nAlthough Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because
\n(a) both belong to d-block
\n(b) both have same number of electrons
\n(c) both have similar atomic radius
\n(d) both belong to the same group of the periodic table<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) both have similar atomic radius<\/p>\n<\/details>\n

\n

Question 35.
\nWhy is HCI not used to make the medium acidic in oxidation reactions of KMnO4<\/sub> in acidic medium?
\n(a) Both HCl and KMnO4<\/sub> act as oxidising agents.
\n(b) KMnO4<\/sub> oxidises HCl into Cl2<\/sub> which is also an oxidising agent.
\n(c) KMnO4<\/sub> is a weaker oxidising agent than HCl.
\n(d) KMnO4<\/sub> acts as a reducing agent in the presence of HCl.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) KMnO4<\/sub> oxidises HCl into Cl2<\/sub> which is also an oxidising agent.<\/p>\n<\/details>\n

\n

Assertion and Reason Type Questions<\/span><\/p>\n

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
\n(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
\n(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A)
\n(c) Assertion (A) is correct, Reason (R) is wrong statement.
\n(d) Assertion (A) is wrong, but Reason (R) is correct statement.<\/p>\n

Question 36.
\nAssertion: Tungsten has very high melting point.
\nReason: Tungsten is a covalent compound.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 37.
\nAssertion: Cuprous salts are diamagnetic.
\nReason: Cu+<\/sup> has 3d-filled subshell.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 38.
\nAssertion: Fe2+<\/sup> has 3d6<\/sup> electronic configuration.
\nReason: Electrons are lost from 4s-orbital to form Fe2+<\/sup> ion.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 39.
\nAssertion: La(OH)3<\/sub> is more basic than LU(OH)3<\/sub>.
\nReason: Basic character of hydroxides of lanthanoids increase on moving from La3+<\/sup> to LU3+<\/sup>.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 40.
\nAssertion: FeCl3<\/sub> reacts with KCNS to give blood red colouration.
\nReason: FeCl3<\/sub> reacts with KCNS to form potassium ferro-ferricyanide.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 41.
\nAssertion: Sodium chloride used to clear snow on the roads.
\nReason: The alkaline solution of potassium dichromate contains CrO4<\/sub>2-<\/sup> ions.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A)<\/p>\n<\/details>\n

\n

Question 42.
\nAssertion: Zn2+<\/sup> is colourless and Cu2+<\/sup> is colourled.
\nReason: Both Zn2+<\/sup> and Cu2+<\/sup> contain 3d-filled subshell.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 43.
\nAssertion: There is a continuous decrease in size among lanthanoids.
\nReason: Lanthanoids show lanthanoid contraction.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 44.
\nAssertion: Lanthanoids show a limited number of oxidation states whereas actinoids show a large number of oxidation states. Reason: Energy gap between 4f, 5d and 6s subshells is small whereas that between 5f, 6d and 7s subshells is large.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 45.
\nAssertion: E\u00b0 value of Mn3+<\/sup>|Mn2+<\/sup> is more positive than for Cr3+<\/sup>|Cr2+<\/sup>.
\nReason: Cr3+<\/sup> is more stable than Cr2+<\/sup> but Mn3+<\/sup> is less stable than Mn2+<\/sup>.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Chemistry The d-and f-Block Elements MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements with Answers Pdf free download is available here. MCQ Questions for Class 12 Chemistry with Answers are prepared as per the Latest Exam Pattern. Students can solve these The d-and f-Block Elements Class 12 MCQs Questions …<\/p>\n

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