The The d – and f – Block Elements VBQs Class 12 Chemistry
VBQs The d – and f – Block Elements Class 12 Chemistry with The d – and f – Block Elements has been provided below for standard students. We have provided chapter wise VBQ for Class 12 Chemistry with The d – and f – Block Elements. The following The d – and f – Block Elements Class 12 Chemistry value based questions with answers will come in your exams. Students should understand the concepts and learn the solved cased based VBQs provided below. This will help you to get better marks in class 12 examinations.
The d – and f – Block Elements VBQs Class 12 Chemistry
Question. Which one of the following ions exhibit highest magnetic moment?
(a) Cu2+
(b) Ti3+
(c) Ni2+
(d) Mn2+
Question. Which of the following ions has the maximum magnetic moment?
(a) Mn+2
(b) Fe+2
(c) Ti3+
(d) Cr+2.
Question. Which of the following transition metal on catalysis the reaction between iodide and persulphate ion?
(a) Fe2+
(b) Fe3+
(d) Both (a) and (c)
Question. Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E0 M3+ /M2+ value ?
(a) Cr(Z = 24)
(b) Mn(Z = 25)
(c) Fe(Z = 26)
(d) Co(Z = 27)
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
Question.Which of the following ions having following electronic structure would have maximum magnetic moment?
(a) 1s2 2s2 2p6 3s2 3 p63d 3
(b) 1s2 2s2 2p6 3s2 3p63d 5
(c) 1s2 2s2 2p6 3s2 3p63d7
(d) 1s2 2s22p6 3s2 3p63d 9
Question. If n is the number of unpaired electrons, the magnetic moment (in BM) of transition metal/ion is given by
Question. Bronze is an alloy of
(a) Pb + Sn + Zn
(b) Cu + Sn
(c) Pb + Zn
(d) Cu + Zn
Question. The magnetic nature of elements depend on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
(a) 3d7
(b) 3d 5
(c) 3d8
(d) 3d 2
Question. Which of the following transition metal ion is colourless in aqueous solution?
(a) Ti4+
(b) Zn2+
(c) V4+
(d) Both (a) and (b)
Question.The aqueous solution containing which one of the following ions will be colourless? (Atomic number:
Sc = 21, Fe = 26, Ti = 22, Mn = 25)
(a) Sc3+
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. KMnO4 can be prepared from K2MnO4 as per the reaction:
3MnO42- +2H2O ⇌ 2MnO42- +MnO2 + 4OH–
The reaction can go to completion by removing OH– ions by adding.
(a) KOH
(b) CO2
(c) SO2
(d) HCl
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. KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidised to________ .
(a) I2
(b) IO–
(c) IO3–
(d) IO4–
Question. Formation of interstitial compound makes the transition metal
(a) more soft
(b) more ductile
(c) more metallic
(d) more hard
Question. Which one of the following ions has the maximum magnetic moment?
(c) Cr3+
(d) Fe3+
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. What is wrong about transition metals?
(a) Diamagnetic
(b) Paramagnetic
(c) Form complexes
(d) Shows variable oxidation state
Question. When acidified K2Cr2O7 solution is added to Sn2+ salts then Sn2+ changes to
(a) Sn
(b) Sn3+
(c) Sn4+
(d) Sn+
Question. The starting material for the manufacture of KMnO4 is
(a) pyrolusite
(b) manganite
(c) magnatite
(d) haematite
Question. An alloy of transition metal containing a non transition metal as a constituent is
(a) invar
(b) bronze
(c) chrome steel
(d) stainless steel
Question. Choose the correct increasing order of the oxidation state of the central metal atom in the following oxoanions.
Question. Titanium shows magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of Ti in the compound?
(a) +1
(b) +4
(c) +3
(d) +2
Question. Which of the following ion(s) is/are oxidising in nature?
(a) (i) and (iii)
(b) only (ii)
(c) (ii) and (iii)
(d) only (iii)
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 is the use of potassium permanganate?
(a) Bleaching of wool, cotton and silk fibers.
(b) decolourisation of oils.
(c) In analytical chemistry.
(d) All of these.
Question. Which of the following reactions are disproportionation reactions ?
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) (i) and (iv)
Question. Which one of the following is coinage metal ?
(a) Zn
(b) Cu
(c) Sn
(d) Pb.
Question. Which of the following is colourless in water?
(b) V3+
(c) Cu3+
(d) Sc3+
Question. K2 on heating with aqueous NaOH gives
(a) Cr2O42-
(b) Cr(OH)3
(c) Cr2O72-
(d) Cr(OH)2
Question. A compound of a metal ion Mx+ (Z = 24) has a spin only magnetic moment of 15 Bohr Magnetons. The number of unpaired electrons in the compound are
Question. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
(a) + 3
(b) + 2
(c) + 6
(d) + 4
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. If a non metal is added to the interstital sites of a metal, then the metal becomes
(a) softer
(b) less tensile
(c) less malleable
(d) more ductile
Question. Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?
(i) Co2+
(ii) Cr2+
(iii) Mn2+
(iv) Cr3+
(b) (i) and (iv)
(d) (ii) and (iv)
Question. Which of the following is amphoteric oxide ?
Mn2O7 ,CrO3,Cr2O3 ,CrO,V2O5,V2O4
(a) V2O5 , Cr2O3
(b) Mn2O7 , CrO3
(c) CrO, V2O5
(d) V2O5, V2O4
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. In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by KMnO4 to
(a) SO32–
(b) SO42–
(d) SO52–
Question. Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of
(a) CrO3
(b) CrCl3
(c) CrO2Cl2
(d) Cr2O3
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
(d) dichromate
Question. CrO3 dissolves in aqueous NaOH to give
(a) Cr2O72–
(b) CrO42–
(c) Cr(OH)3
Question. Which of the following is most acidic?
(a) Mn2O7
(b) V2O5
(c) Fe2O3
Question. An explosion take place when conc. H2SO4 is added to KMnO4. Which of the following is formed?
(b) MnO2
(c) MnSO4
(d) M2O3
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 form of dichromate, Cr (VI) is a strong oxidising agent in acidic medium but Mo (VI) in MoO3 and W (VI) in WO3 are not because ____________ .
(i) Cr (VI) is more stable than Mo(VI) and W (VI).
(ii) Mo (VI) and W(VI) are more stable than Cr(VI).
(iii) Higher oxidation states of heavier members of group- 6 of transition series are more stable.
(iv) Lower oxidation states of heavier members of group-6 of transition series are more stable.
(b) (ii) and (iii)
(c) (i) and (iv)
Question. On the basis of data given below,
Which of the following statements is incorrect?
(a) Sc3+ has good stability due of [Ar]3d04s0 configuration.
(b) Mn3+ is more stable than Mn2+.
(c) Cr2+ is reducing in nature.
(d) Copper does not give H2 on reaction with dil. H2SO4.
Question. Brass is an alloy of
(a) Zn and Sn
(b) Zn and Cu
(d) Cu and Sn
Question. Which group contains coloured ions out of
(i) Cu2+
(ii) Ti4+
(iii) Co2+
(iv) Fe2+
(a) (i), (ii), (iii), (iv)
(b) (i), (iii), (iv)
(c) (ii), (iii)
(d) (i), (ii)
CBSE Class 12 Mathematics Term 1 Sample Paper Set C
MCQ Questions Chapter 1 Sets Class 11 Mathematics
Relations and Functions VBQs Class 12 Mathematics
Environmental Issues VBQs Class 12 Biology