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 of the following has the maximum number of unpaired electrons?
(a) Ti2+
(b) Fe2+
(c) Cr+
(d) Cu+
Answer
C
Question. Which of the following configuration is correct for iron ?
(a) 1s2,2s22p6,3s23p63d4
(b) 1s2,2s22p6,3s23p63d64s2
(c) 1s2,2s22p6,3s23p63d2
(d) 1s2,2s22p6,3s23p63d24s2
Answer
B
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 ionization enthalpy?
(a) Vanadium (Z = 23)
(b) Chromium (Z = 24)
(c) Manganese (Z = 25)
(d) Iron (Z = 26)
Answer
C
Question. Which of the following element does not belong to first transition series?
(a) Fe
(b) V
(c) Ag
(d) Cu
Answer
C
Question. The first element in the 3d-transition series is
(a) Sc
(b) Ti
(c) V
(d) Ca
Answer
A
Question. The last electron in d-block elements goes to
(a) (n-1) d
(b) nd
(c) np
(d) (n-1) s
Answer
A
Question. The elements which exhibit both vertical and horizontal similarites are
(a) inert gas elements
(b) representative elements
(c) rare elements
(d) transition elements
Answer
D
Question. An atom has electronic configuration
1s2 2s2 2p63s23p63d34s2 in which group would it be placed?
(a) Fifth
(b) Fifteenth
(c) Second
(d) Third
Answer
A
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
Answer
A
Question.. For d block elements the first ionization 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
Answer
A
Question. Number of unpaired electrons in Ni2+(Z=28) is
(a) 4
(b) 2
(c) 6
(d) 8
Answer
B
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
Answer
D
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
Answer
C
Question. The common oxidation states of Ti are
(a) + 2 eand + 3
(b) + 3 and + 4
(c) – 3 and – 4
(d) + 2, + 3 and + 4
Answer
D
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.
Answer
C
Question.Which of the following pairs has the same size?
(a) Fe2+ , Ni2+
(b) Zr4+ , Ti4+
(c) Zr4+ , Hf 4+
(d) Zn2+ , Hf 4+
Answer
C
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
Answer
B
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
Answer
C
Question. The transition elements have a general electronic configuration
![](https://worksheetsbag.com/wp-content/uploads/2022/05/image-384.png)
Answer
C
Question. Which one of the following ions has electronic configuration [Ar] 3d6 ?
(a) Ni3+
(b) Mn3+
(c) Fe3+
(d) Co3+
(At. Nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)
Answer
D
Question. Transition metals mostly are
(a) diamagnetic
(b) paramagnetic
(c) neither diamagnetic nor paramagnetic
(d) both diamagnetic and paramagnetic
Answer
B
Question.Which one of the following species is paramagnetic?
(a) N2
(b) Co
(c) Cu+
(d) Zn
Answer
B
Question. The no. of unpaired electrons in Mn7+ ions (At. no. of Mn = 25) is
(a) 0
(b) 1
(c) 2
(d) 3
Answer
A
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
Answer
D
Question. Which one of the following transition elements does not exhibit variable oxidation state?
(a) Ni
(b) Cu
(c) Fe
(d) Sc
Answer
D
Question. Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number ?
(a) 25
(b) 26
(c) 27
(d) 24
Answer
B
Question. Which of the following element is not a member of transition elements ?
(a) Zn
(b) Pt
(c) Ce
(d) Mo
Answer
C
Question. Maximum oxidation state is shown by
(a) Os
(b) Mn
(c) Co
(d) Cr
Answer
A
Question.Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
(a) 3d54s1
(b) 3d54s2
(c) 3d24s2
(d) 3d34s2
Answer
B
Question. Correct electronic configuration of Cr (Z = 24) is
(a) 1s2 2s2 2p6 3s2 3p6 3d 7 4s1
(b) 1s2 2s2 2p6 3s2 3p6 3d5 4s1
(c) 1s2 2s2 2p6 3s2 3p6 3d 7 4s2
(d) 1s2 2s2 2p6 3s2 3p6 3d 6 4s2
Answer
B
Question. Iron 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) Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds.
Answer
D
Question. Which one of the following ions is the most stable in aqueous solution?
(a) V3+
(b) Ti3+
(c) Mn3+
(d) Cr3+
(At.No. Ti = 22, V = 23, Cr = 24, Mn = 25)
Answer
D
Question. Which of the following statements is incorrect?
(a) Zn,Cd and Hg due to presence of completely filled d-orbitals [(n–1)d10ns2] are not studied along with other transition metals.
(b) Zn, Cd and Hg have low m.p and are comparitively softer than other transition metals.
(c) Metallic bond made by elements with d 5 configuration is stronger as compared to metalic bond made by elements with d 3 configuration.
(d) Metals of 5d series forms strong metallic bonds as compared with metals of 3d series.
Answer
A
Question. Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them ?
(a) (n – 1)d3 ns2
(b) (n – 1)d5 ns1
(c) (n – 1)d8 ns2
(d) (n – 1)d5 ns2
Answer
D
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
Answer
C
Question. (n -1)d10ns2 is the general electronic configuration of
(a) Fe, Co, Ni
(b) Cu, Ag, Au
(c) Zn, Cd, Hg
(d) Se, Y, La
Answer
C
Question. Which of the following does not represent the correct order of the properties indicated ?
(a) Ni2+ > Cr2+ > Fe2+ > Mn2+ (size)
(b) Sc > Ti > Cr > Mn (size)
(c) Mn2+ > Ni2+ < Co2+ <Fe2+ (unpaired electron)
(d) Fe2+ > Co2+ > Ni2+ > Cu2+ (unpaired electron)
Answer
A
Question. Manganese belongs to
(a) 1st transition series
(b) 2nd transition series
(c) 3rd transition series
(d) 4th transition series
Answer
A
Question. Which of the following transition element shows the highest oxidation state ?
(a) Mn
(b) Fe
(c) V
(d) Cr
Answer
A
Question. Which of the following elements does not showvariable oxidation states?
(a) Copper
(b) Iron
(c) Zinc
(d) Titanium
Answer
C
Question. In first transition series, the melting point of Mn is low because
(a) due to d10 configuration, metallic bonds are strong
(b) due to d7 configuration, metallic bonds are weak
(c) due to d5 configuration, metallic bonds are weak
(d) None of these
Answer
C
Question. Metallic radii of some transition elements are given below.Which of these elements will have highest density ?
Element Fe Co Ni Cu Metallic radii/pm 126 125 125 128
(a) Fe
(b) Ni
(c) Co
(d) Cu
Answer
D
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
Answer
D
Question. Transition metals usually exhibit highest oxidation states in their
(a) chlorides
(b) fluorides
(c) bromides
(d) iodides
Answer
B
Question. Which of the following has more unpaired d-electrons?
(a) Zn+
(b) Fe2+
(c) Ni+
(d) Cu+
Answer
B
Question. The number of unpaired electrons in a nickel atom in ground state are (At. No. of Ni = 28)
(a) 2
(b) 5
(c) 3
(d) 7
Answer
A
Question.Question.Which of the following is incorrect?
(a) Mn shows oxidation state of +7 in MnF7
(b) Fe and Co shows +3 oxidation state in FeX3 and CoF3.
(c) V shows oxidation state of + 5 in VF5.
(d) Cu does not shows +2 oxidation state with I–.
Answer
A
Question. Which of the following species is/are paramagnetic?
Fe2+, Zn0, Hg2+, Ti4+
(a) Fe2+ only
(b) Zn0 and Ti4+
(c) Fe2+ and Hg2+
(d) Zn0 and Hg2+
Answer
A
Question. Transition elements
(a) have low melting point
(b) exhibit variable oxidation states
(c) do not form coloured ions
(d) show inert pair effect
Answer
B
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
Answer
A