In this post we are sharing with you Practice MCQs of d and f block Elements for MDCAT Preparation.
1 How many electrons are present in d-subshell of Cu+2:
A) 7
B) 8
C) 9
D) 10
2 Which property makes different non-typical elements from typical transition elements:
A) Diamagnetism
B) paramagnetism
C) Variable oxidation state
D) Shining surface
3 The electronic configuration of Sc(21) is that of:
A) 4π ²3π⁷
B) 4π ²3π²
C) 4π ²3π⁵
D) [Ar] 4s²3π⇂
4 Amongst the following identify the species with an atom in +6 oxidation state
A) MnO⁴-
B) Cr(CN)6³-
C) CrO2Cl²
D) NiF6²-
5 Mn shows how many oxidation state:
A) 5
B) 6
C) 7
D) 8
6 Transition elements show coloured compounds due to:
A) Electrons reside in low
B) d-d transition
C) Coordination
D) Large size of atoms energy d-orbital
7 Which of the following has the maximum number of unpaired electrons?
A) Mg²+
B) Ti³+
C) V³+
D) Fe²+
8 The Atoms, ions or neutral molecules, which surrounds the central metal ion and donate electron pairs to it are called:
A) Ligands
B) Lewis base
C) Lewis acid
D) chelates
9 The tendency of 3d metal ions to form stable complexes is due to :
A) Strong electronegative
B) Very low ionization
C) Variable valency
D) High charge/radius ratio nature emerges and vacant d-orbitals
10. What is the co-ordination number of iron in πΎ4[πΉπ(πΆπ)6] :
A) 2
B) 4
C) 6
D) 8
11 Which of the following has highest melting point:
A) Na
B) Mg
C) Al
D) C
12 To manufacture NH3 from N2 and H2 _____ is used as catalyst :
A) Fe
B) Fe3O4
C) Fe2O3
D) P2O5
13 _______ metal catalyst is generally used for the hydrogenation of fats and oils to alcohols:
A) Cr
B) Cu
C) Ni
D) Mn
14 N2 does not form complexes due to the:
A) Presence of d- orbitals
B) Absence of d-orbitals
C) d-orbitals does not
D) Highly electronegative effect
15 Metals have the property of electrical conductance due the presence of the ________ in outermost shell:
A) More electrons
B) Less electrons
C) Loose electrons
D) Free electrons
16 The transition elements exhibit variable valency due to
A) Small difference of energy in nS² and (n-1)dn electrons (n=1,2,3……)
B) Same energy of the ns² and (n-1)dn electrons
C) Different energy of the ns and np electrons
D) Different energy of the (n-1)dn electrons
17 The coordination number and oxidation number of M in the compound [π΄(π΅π―π)π]πΊπΆπ will be
A) 6 and 3
B) 2 and 6
C) 6 and 2
D) 3 and 6
18. In the complex ion, [πͺπ(πͺππΆπ)π(π―ππΆ)π]−, the oxidation number of Cr is:
A) +1
B) +2
C) +3
D) +4
19 Which of the following possesses sp3d2 hybridization?
A) [πΆπ’|ππ»3)4] ππ4
B) [Co(NH3)6]Cl3
C) k3[Fe(CN)4]
D) K4[Fe(CN)]6
20 H2SO4 is also known as:
A) King of chemicals
B) Slue vitriol
C) Caustic soda
D) Baking soda
23 Which of the following acts as catalyst in contact process:
A) Platinum
B) P2O5
C) V2O5
D) Pt
24 What is the benefit of contact process for the manufacture of the H2SO4:
A) Can get H2SO4 of required concentration
B) Have by-product
C) Catalyst handling is difficult
D) Exothermic reaction will contracted
25 Iron pyrites are burnt in excess of O2 to produce gas:
A) Fe2O3
B) SO2
C) CO2
D) SO3
26 SO2 absorbs moisture in atmosphere and form______ which causes acid rain:
A) HNO3
B) H2SO4
C) HCl
D) CH3COOH
27 The first ionization energy of the elements of the first transition series (Ti to Cu)
A) Increase as the atomic number increase
B) Decrease as the atomic numbers increase
C) Does not show any change as the addition of electrons takes place in the inner (n1)d orbitals
D) Increase from Ti to Mn and then decrease from Mn to Cu
28 The number of d-electrons of Cr in [Cr(H2O)6]³+ ions is
A) 2
B) 3
C) 4
D) 5
29 How can we maximize the yield of NH3 in Haber’s process?
A) By increasing pressure
B) By decreasing pressure
C) By keeping constant pressure
D) By adding catalyst
30 N2 + 3H2⇌ 2NH3, it is a _____ reaction:
A) Endothermic
B) Exothermic
C) Non-spontaneous
D) Not feasible
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