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The d-and f-Block Elements 12 MCQs Questions with Answers
Shape of d-orbital is
(b) dumb bell
(c) double dumb bell
(d) none of these
Answer: (c) double dumb bell
Lanthanoid contraction is due to increase in
(a) atomic number
(b) effective nuclear charge
(c) atomic radius
(d) valence electrons
Answer: (b) effective nuclear charge
Which block of elements are known as transition elements?
Answer: (c) d-block
Which one of the following is diamagnetic ion?
Answer: (d) Zn2+
The number of unpaired electrons in gaseous species of Mn3+, Cl3+ and V3+ respectively are and the most stable species is
(a) 4, 3 and 2; V3+
(b) 3, 3 and 2; Cr3+
(c) 4, 3 and 2; Cr3+
(d) 3, 3 and 3; Mn3+
Answer: (c) 4, 3 and 2; Cr3+
When manganese dioxide is fused with KOH in air. It gives
(a) potassium permanganate
(b) potassium manganate
(c) manganese hydroxide
Answer: (b) potassium manganate
Which is the first man-made element?
Answer: (c) Tc
Which transition metal has highest density?
Answer: (a) Os
The number of moles of KMnO. that will be needed to react with one mole of SO32- in acidic solution.
Answer: (d) 2/5
The stability of Mn2+, Fe2+, Cr2+, Co2+ is in order of (At No. of Mn = 25, Fe = 26, Cr = 24, Co = 27)
(a) Mn2+ > Fe2+ > Cr2+ > Co2+
(b) Fe2+ > Mn2+ > Co2+ > Cr2+
(c) Co2+ > Mn2+ > Fe2+ > Cr2+
(d) Cr2+ > Mn2+ > Co2+ > Fe2+
Answer: (a) Mn2+ > Fe2+ > Cr2+ > Co2+
The reaction of acidified KMnO and FLO, gives
(a) Mn4+ and O2
(b) Mn2+ and O2
(c) Mn2+ and O3
(d) Mn4+ and MnO2
Answer: (b) Mn2+ and O2
The colour of KmnO, is due to
(a) L → M charge transfer transition
(b) a → σ* transition
(c) M → L charge transfer transition
(d) d → d transition
Answer: (a) L → M charge transfer transition
Out of Mn2O7 V2O3, V2O5, CrO, Cr2O3, the basic oxides are
(a) Mn2O7, V2O3
(b) V2O3, V2O5
(c) V2O5, CrO
(d) V2O3 and CrO
Answer: (d) V2O3 and CrO
The oxidation state of Cr in final product formed by reaction of KI and acidified dichromate solution is
Answer: (d) +3
The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct? [NCERT Exemplar]
(a) Cu(II) is more stable
(b) Cu(II) is less stable
(c) Cu(I) and Cu(II) are equally stable
(d) Stability of Cu(I) and Cu(II) depends on nature of copper salts
Answer: (a) Cu(II) is more stable
Anomalous electronic configuration in the 3d series are of
(a) Cr and Fe
(b) Cu and Zn
(c) Fe and Cu
(d) Cr and Cu
Answer: (d) Cr and Cu
Which of the following are d-block elements but not regarded as transistion elements?
(a) Cu, Ag, Au
(b) Zn, Cd, Hg
(c) Fe, Co, Ni
(d) Ru, Rh, Pd
Answer: (b) Zn, Cd, Hg
Which one of the following characteristics of the transistion metals is associated with higher catalytic activity?
(a) High enthalpy of atomisation
(b) Paramagnetic behaviour
(c) Colour of hydrate ions
(d) Variable oxidation states
Answer: (d) Variable oxidation states
The melting point of copper is higher than that of zinc because
(a) copper has a bcc structure
(b) the atomic volume of copper is higher
(c) the electrons of copper are involved in metallic bonding
(d) the s as well as d electrons of copper are involved in metallic bonding
Answer: (c) the electrons of copper are involved in metallic bonding
Zr and Hf have almost equal atomic and ionic radii because of
(a) diagonal relationship
(b) lartthanoid contraction
(c) actinoid contraction
(d) belonging to the same group
Answer: (b) lartthanoid contraction
When KMn04 acts as oxidising agent in alkaline medium, the oxidation number of Mn decreases by
Answer: (c) 3
The transition element with lowest atomic number is
Answer: (a) Scandium
The property which is not characteristic of transistion metals is
(a) variable oxidation states.
(b) tendency to form complexes.
(c) formation of coloured compounds.
(d) natural radioactivity
Answer: (d) natural radioactivity
Which of the following is incorrect for KMnO4 to be used as an oxidising agent?
(a) HCl cannot be used because some KMnO4 is consumed in the reaction.
(b) Nitric acid is not used for the above purpose because it itself acts as a self oxidising agent and will react with the reducing agent.
(c) The equivalent weight of KMnO4 in basic medium is 158.
(d) The number of electrons involved in oxidation of KMnO4 in acidic medium is 3.
Answer: (d) The number of electrons involved in oxidation of KMnO4 in acidic medium is 3.
The equivalent mass of K2Cr2O7, when it acts as oxidising agent in acidic medium, is equal to
Answer: (c) M/6
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