Please refer to the MCQ Questions for Class 12 Chemistry Chapter 8 The d and f Block Elements with Answers. The following The d and f Block Elements Class 12 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Chemistry with Answers for all chapters in your NCERT Class 12 Chemistry book.
The d and f Block Elements Class 12 MCQ Questions with Answers
See below The d and f Block Elements Class 12 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.
Question. Identify the incorrect statement.
(a) Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
(b) The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
(c) Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
(d) The oxidation states of chromium in CrO42– and Cr2O72– are not the same.
Question. The calculated spin only magnetic moment of Cr2+ ion is
(a) 3.87 BM
(b) 4.90 BM
(c) 5.92 BM
(d) 2.84 BM
Question. Magnetic moment 2.84 B.M. is given by
(At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)
Question. Which of the following processes does not involve oxidation of iron?
(a) Formation of Fe(CO)5 from Fe.
(b) Liberation of H2 from steam by iron at high temperature.
(c) Rusting of iron sheets.
(d) Decolourisation of blue CuSO4 solution by iron.
Question. Which of the following statements about the interstitial compounds is incorrect?
(a) They are much harder than the pure metal.
(b) They have higher melting points than the pure metal.
(c) They retain metallic conductivity.
(d) They are chemically reactive.
Question. Identify the alloy containing a non-metal as a constituent in it.
(c) Bell metal
Question. The catalytic activity of transition metals and their compounds is ascribed mainly to
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation states
(d) their chemical reactivity.
Question. 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) Ti3+ < V3+ < Cr3+ < Mn3+ : increasing magnetic moment
(c) Ti < V < Cr < Mn : increasing melting points
(d) Ti < V < Mn < Cr : increasing 2nd ionization enthalpy
Question. Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E°M2+/M) value has a positive sign?
(a) Co (Z = 27)
(b) Ni (Z = 28)
(c) Cu (Z = 29)
(d) Fe (Z = 26)
Question. 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) Mn > Fe > Cr > Co
(b) Fe > Mn > Co > Cr
(c) Co > Mn > Fe > Cr
(d) Cr > Mn > Co > Fe
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)
Question. Which of the following ions will exhibit colour in aqueous solutions?
(a) La3+ (Z = 57)
(b) Ti3+ (Z = 22)
(c) Lu3+ (Z = 71)
(d) Sc3+ (Z = 21)
Question. Which of the following pairs has the same size?
(a) Fe2+, Ni2+
(b) Zr4+, Ti4+
(c) Zr4+, Hf4+
(d) Zn2+, Hf4+
Question. Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
Question. Silver, gold, platinum, iron, copper and titaniwn are part of the
(b) transition metals
(d) All of these
Question. Why d-block element fonn complexes?
(a) Due to large size and high nuclear charge
(b) Due to small size and low nuclear charge
(c) Due to small size and high nuclear charge
(d) None of the above
Question. Which of the following arrangements does not represent the correct order of the property stated against it?
(a) V2+ < Cr2+ < Mn2+ < Fe2+ (paramagnetic behaviour)
(b) Ni2+ < Co2+ < Fe2+ < Mn2+ (ionic size)
(c) Co3+ < Fe3+ < Cr3+ < Sc3+ (stability in aqueous solution)
(d) Sc < Ti < Cr < Mn (number ofoxidation states)
Question. Four successive members of the first row transition elements are listed below with atomic nwnbers. Which one of them is expected to have the highest E°M3+ / M2+ value?
(a) Cr (Z = 24)
(b) Mn (Z = 25)
(c) Fe (Z = 26)
(d) Co (Z = 27)
Question. The catalytic activity of the transition metals and their compounds is described to
(a) their chemical reactivity
(b) their magnetic behaviour
(c) their unfilled d-orbitals
(d) their ability to adopt multiple oxidation states and their complexing ability
(e) None of the above
Question. What is the general electronic configuration for 2nd row transition series?
(a) [Ne] 3d1-10, 4s2
(b) [Ar] 3d1-10, 4s1-2
(c) [Kr] 4d1-10, 5s1-2
(d) [Xe] 5d1-10, 5s1-2
Question. The colour of light absorbed by an aqueous solution of CuSO4 is
Question. For the given aqueous reaction which of the statement(s) is (are) true?
(a) The first reaction is redox reaction
(b) White precipitate is Zn3 [Fe(CN)6 ]2
(c) Addition of filtrate to starch solution gives blue colour
(d) White precipitate is soluble in NaOH solution
Question. Irons exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect?
(a) Ferrous oxide is more basic in nature than the ferric oxide
(b) Ferrous compounds are relatively more ionic than the corresponding ferric compounds
(c) Ferrous compounds are less volatile than the corresponding ferric compounds
(d) Ferrotts compounds are more easily hydrolysed than the corresponding ferric compounds
Question. Green vitriol is
(a) ferrous sulphate
(b) tin oxide
(c) zinc oxide
(d) ferrous carbonate
Question. Which of the following in Rinmann’s green?
(b) ZnS + BaSO4
(c) ZnSO4 – 7H2O
(d) ZnO – CoO
Question. A metal gets coated with a green basic carbonate when exposed at atmosphere. Metal is
Question. The colour of Cu2+2 containing salt is
Question. Silver iodide is used for producing artificial rain because Agl
(a) is easy to synthesise
(b) has crystal structure similar to ice
(c) is insoluble in water
(d) is easy to spray at high altitude
Question. In chromite ore, the oxidation number of iron and chromium are respectively
(a) + 3, + 2
(b) + 3, + 6
(c) + 2, + 6
(d) + 2, + 3
Question. The spin only magnetic moment of Fe2+ ion (in BM) is approximately
Question. The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is
(a) Mn > Cr > Ti > V
(b) Ti > V > Cr > Mn
(c) Cr > Mn > V > Ti
(d) V > Mn > Cr > Ti
Question. In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29,Co = 27)
(a) Ni2+, Cu+
(b) Ni2+, Ti3+
(c) Sc3+, Ti3+
(d) Sc3+, Co2+
Question. Four successive members of the first row transition elements are listed below with their atomic numbers.
Which one of them is expected to have the highest third ionisation enthalpy?
(a) Vanadium (Z = 23)
(b) Chromium (Z = 24)
(c) Manganese (Z = 25)
(d) Iron (Z = 26)
Question. The aqueous solution containing which one of the following ions will be colourless?
(Atomic number : Sc = 21, Fe = 26,Ti = 22, Mn = 25)
Question. Which one of the following characteristics of the transition metals is associated with their catalytic activity?
(a) High enthalpy of atomization
(b) Paramagnetic behaviour
(c) Colour of hydrated ions
(d) Variable oxidation states
Question. The basic character of the transition metal monoxides follows the order
(Atomic no’s. Ti = 22, V = 23, Cr = 24, Fe = 26)
(a) VO > CrO > TiO > FeO
(b) CrO > VO > FeO > TiO
(c) TiO > FeO > VO > CrO
(d) TiO > VO > CrO > FeO
Question. Which of the following shows maximum number of oxidation states?
Question. Which ion is colourless?
Question. Bell metal is an alloy of
(a) Cu + Zn
(b) Cu + Sn
(c) Cu + Pb
(d) Cu + Ni
Question. In which of the following compounds transition metal has zero oxidation state?
Question. Which one of the following ionic species will impart colour to an aqueous solution?
Question. A transition element X has a configuration [Ar]3d4 in its +3 oxidation state. Its atomic number is
Question. The mercury is the only metal which is liquid at 0°C.
This is due to its
(a) high vapour pressure
(b) weak metallic bond
(c) high ionization energy
(d) both (b) and (c).
Question. The manganate and permanganate ions are tetrahedral, due to
(a) the p-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese
(b) the p-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
(c) there is no p-bonding
(d) the p-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese.
Question. When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is
Question. Which one of the following ions exhibits d-d transition and paramagnetism as well?
Question. Name the gas that can readily decolourise acidified KMnO4 solution.
Question. Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?
(a) SO2 is reduced.
(b) Green Cr2(SO4)3 is formed.
(c) The solution turns blue.
(d) The solution is decolourised.
Question. Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?
Question. The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives
(a) Mn4+ and O2
(b) Mn2+ and O2
(c) Mn2+ and O3
(d) Mn4+ and MnO2.
Question. Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of
Question. The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
(d) one fifth.
Question. The oxidation state of Cr in K2Cr2O7 is
Question. Which one of the following statements related to lanthanons is incorrect?
(a) Europium shows +2 oxidation state.
(b) The basicity decreases as the ionic radius decreases from Pr to Lu.
(c) All the lanthanons are much more reactive than aluminium.
(d) Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis.
Question. Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)
(a) Zr(40) and Hf(72)
(b) Zr(40) and Ta(73)
(c) Ti(22) and Zr(40)
(d) Zr(40) and Nb(41)
Question. Reason of lanthanoid contraction is
(a) negligible screening effect of ‘f ’-orbitals
(b) increasing nuclear charge
(c) decreasing nuclear charge
(d) decreasing screening effect.
Question. Which of the following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)