The d and f Block Elements MCQ Class 12 Chemistry
Please refer to Chapter 8 The d and f Block Elements MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter The d and f Block Elements and then attempt the following objective questions.
MCQ Questions Class 12 Chemistry Chapter 8 The d and f Block Elements
The d and f Block Elements MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.
Question. In 3d-series atomic number (Z) varies from
(a) Z = 21− 30
(b) Z = 22 − 30
(c) Z = 20 − 30
(d) Z = 31− 40
Question. The number of unpaired electrons in gaseous species of Mn3+, Cr3+ and V3+ respectively are.
(a) 4, 3 and 2
(b) 3, 3 and 2
(c) 4, 3 and 2
(d) 3, 3 and 3
Question. Which of the following element does not belong to first transition series?
Question. The last electron in d-block elements goes to
(a) (n-1) d
(d) (n-1) s
Question. The first element in the 3d-transition series is
Question. The elements which exhibit both vertical and horizontal similarites are
(a) inert gas elements
(b) representative elements
(c) rare elements
(d) transition elements
Question. Which one of the following is an example of non-typical transition elements ?
(a) Li, K, Na
(b) Be, Al, Pb
(c) Zn, Cd, Hg
(d) Ba, Ga, Sr.
Question. The outer electronic configuration of Ag is 4d 10 5s1, it belongs to
(a) 5th period, group 4
(b) 4th period, group 5
(c) 5th period, group 11
(d) 6th period, group 9
Question. The valence shell of transition elements consists of
(a) nd orbitals
(b) (n-1) d orbitals
(c) ns np nd orbitals
(d) (n-1) d ns orbitals
Question. Manganese belongs to
(a) 1st transition series
(b) 2nd transition series
(c) 3rd transition series
(d) 4th transition series
Question. Number of unpaired electrons in Ni2+(Z=28) is
Question. The transition metals have a less tendency to form ions due to
(a) high ionisation energy
(b) low heat of hydration of ions
(c) high heat of sublimation
(d) All of these
Question. Which of the following element is not a member of transition elements ?
Question. The common oxidation states of Ti are
(a) + 2 and + 3
(b) + 3 and + 4
(c) – 3 and – 4
(d) + 2, + 3 and + 4
Question. Which of the following has more unpaired d-electrons?
Question. Maximum oxidation state is shown by
Question. Zinc and mercury do not show variable valency like d-block elements because
(a) they are soft
(b) their d-shells are complete
(c) they have only two electrons in the outermost subshell
(d) their d-shells are incomplete
Question. The number of unpaired electrons in a nickel atom in ground state are (At. No. of Ni = 28)
Question. Which of the following transition element shows the highest oxidation state ?
Question. KI and CuSO4 solutions on mixing produce
(a) Cu2l2 + K2SO4
(b) Cu2l2 + l2 + K2SO4
(c) Cul2 + K2SO4
(d) Cul2 + l2 + K2SO4
Question. Which do not decolourise KMnO4 aqueous solution?
Question. Philosopher’s wool on heating with BaO at 1100°c produce
(a) Ba + ZnCI2
(d) BaO2 + Zn
Question. Brass is an alloy of Cu with
Question. A white precipitate is formed on adding KI to CuSO4 solution. It is of
Question. The 3d-block element that exhibits maximum number of oxidation states is
Question. Among the following ions (hydrated), the colourless metal ion is
Question. Which of the following is used as indelibleink?
(a) Aqueous CuSO4 solution
(b) Aqueous AgNO3 solution
(c) Aqueous NaCl solution
(d) Aqueous NaOH solution
Question. Ford-block elements the first ionisation potential is of the order
(a) Zn > Fe > Cu> Cr
(b) Sc = Ti < V = Cr
(c) Zn < Cu < Ni < Co
(d) V > Cr > Mn > Fe
Question. Which of the following is amphoteric?
Question. What is the correct order of spin only magnetic moment (in BM) of Mn2+, Cr2+ and V2+ ?
(a) Mn2+ > V2+ > Cr2+
(b) V2+ > Cr2+ > Mn2+
(c) Mn2+ > Cr2+ > V2+
(d) Cr2+ > V2+ > Mn2+
Question. Which pair of compounds is expected to show similar colour in aqueous medium ?
(a) FeCI3 and CuCI2
(b) VOCI2 and CuCI2
(c) VOCI2 and FeCI2
(d) FeCI2 and MnCI2
Question. Which of the following is deliquescent?
Question. KMnO4 in basic medium is reduced to
Question. Number of electrons in 3d-orbital of v2+, Cr2+, Mn2+ and Fe2+ are 3, 4, 5, and 6 respectively. Which of the following ions will have largest value of magnetic moment ( μ )?
Question. Transition metals mostly are
(c) neither diamagnetic nor paramagnetic
(d) both diamagnetic and paramagnetic
Question. Which of the following is not correct about transition metals?
(a) Their melting and boiling points are high
(b) Their compounds are generally coloured
(c) They can form ionic or covalent compounds
(d) They do not exhibit variable valency
Question. Which of the following elements does not showvariable oxidation states?
Question. Which one of the following transition elements does not exhibit variable oxidation state?
Question. Transition metals usually exhibit highest oxidation states in their
Question. What is wrong about transition metals?
(c) Form complexes
(d) Shows variable oxidation state
Question. Transition elements
(a) have low melting point
(b) exhibit variable oxidation states
(c) do not form coloured ions
(d) show inert pair effect
Question. Which of the following ions has the maximum magnetic moment?
Question. Titanium shows magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of Ti in the compound?
Question. The magnetic nature of elements depend on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
(b) 3d 5
(d) 3d 2
Question. Which of the following statements about the interstitial compounds is incorrect ?
(a) They are chemically reactive.
(b) They are much harder then the pure metal.
(c) They have higher melting points than the pure metal.
(d) They retain metallic conductivity.
Question. Transition elements form coloured ions due to
(a) d-d transition
(b) fully filled d-orbitals
(c) smaller atomic radii
(d) availability of s-electrons
Question. Formation of interstitial compound makes the transition metal
(a) more soft
(b) more ductile
(c) more metallic
(d) more hard
Question. Gun metal is an alloy of
(a) Cu and Al
(b) Cu and Sn
(c) Cu, Zn and Sn
(d) Cu, Zn and Ni
Question. If a non metal is added to the interstital sites of a metal, then the metal becomes
(b) less tensile
(c) less malleable
(d) more ductile
Question. An explosion take place when conc. H2SO4 is added to KMnO4. Which of the following is formed?
Question. Brass is an alloy of
(a) Zn and Sn
(b) Zn and Cu
(c) Cu, Zn and Sn
(d) Cu and Sn
Question. The catalytic activity of transition metals and their compounds is mainly due to
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation state
(d) their chemical reactivity
Question. Which one of the following is coinage metal ?
Question. Transition metals show catalytic activity
(a) Due to their ability to form complexes.
(b) Due to their ability to show multiple oxidation state.
(c) Due to availabiltiy of d orbitals for bond formation.
(d) Both (a) and (b).
Question. Which of the following transition metal on catalysis the reaction between iodide and persulphate ion?
(d) Both (a) and (c)
Question. The starting material for the manufacture of KMnO4 is
Question. The bonds present in the structure of dichromate ion are
(a) four equivalent Cr – O bonds only
(b) six equivalent Cr – O bonds and one O – O bond
(c) six equivalent Cr – O bonds and one Cr – Cr bond
(d) six equivalent Cr – O bonds and one Cr – O – Cr bond
Question. Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of
Question. Which of the following is colourless in water?
Question. The acidic, basic or amphoteric nature of Mn2O7, V2O5 and CrO are respectively
(a) acidic, acidic and basic
(b) basic, amphoteric and acidic
(c) acidic, amphoteric and basic
(d) acidic, basic and amphoteric
Question. In the laboratory, manganese (II) salt is oxidised to permanganate ion in aqueous solution by
(a) hydrogen peroxide
(b) conc. nitric acid
(c) peroxy disulphate
Question. Bronze is an alloy of
(a) Pb + Sn + Zn
(b) Cu + Sn
(c) Pb + Zn
(d) Cu + Zn
Question. An alloy of transition metal containing a non transition metal as a constituent is
(c) chrome steel
(d) stainless steel
Question. Which of the following transition metal ion is colourless in aqueous solution?
(d) Both (a) and (b)
Question. If KMnO4 is reduced by oxalic acid in an acidic medium then oxidation number of Mn changes from
(a) 4 to 2
(b) 6 to 4
(c) +7 to +2
(d) 7 to 4
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