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The d-and f-Block Elements Class 12 MCQs Questions with Answers
Question 1.
Which one of. the following metals is used as a catalyst in the Haber’s process?
(a) Tungsten
(b) Molybdenum
(c) Chromium
(d) iron containing Mo.
Answer
Answer: (d) iron containing Mo.
Question 2.
When manganese dioxide is fused with KOH in air. It gives
(a) potassium permanganate
(b) potassium manganate
(c) manganese hydroxide
(d) Mn3O4.
Answer
Answer: (b) potassium manganate
Question 3.
Whith metal has highest melting point?
(a) Pt
(b) W
(c) Pd
(d) Au.
Answer
Answer: (b) W
Question 4.
Which metal has lowest melting point?
(a) Cs
(b) Na
(c) Hg
(d) Sn
Answer
Answer: (c) Hg
Question 5.
Which is the first man-made element?
(a) Sc
(b) Os
(c) Tc
(d) Zr
Answer
Answer: (c) Tc
Question 6.
Which metal has highest density?
(a) Pt
(b) Hg
(c) Pd
(d) Os
Answer
Answer: (d) Os
Question 7.
Which transition metal has highest density?
(a) Os
(b) Zn
(c) Sc
(d) La
Answer
Answer: (a) Os
Question 8.
Which transition metal can show highest oxidation state?
(a) Sc
(b) Ti
(c) Os
(d) Zn
Answer
Answer: (c) Os
Question 9.
In KMnO4 oxidation number of Mn is
(a) +2
(b) + 4
(c) + 6
(d) + 7
Answer
Answer: (d) + 7
Question 10.
When KMn04 acts as oxidising agent in alkaline medium, the oxidation number of Mn decreases by
(a) 1
(b) 2
(c) 3
(d) 5.
Answer
Answer: (c) 3
Question 11.
Ag+ ion is isoelectric with
(a) OP
(b) Cd2+
(c) Zn2+
(d) Pd2+
Answer
Answer: (b) Cd2+
Question 12.
The transition element with lowest atomic number is
(a) Scandium
(b) Titanium
(c) Zinc
(d) Lanthanum.
Answer
Answer: (a) Scandium
Question 13.
Which of the following oxides is amphoteric in nature?
(a) NiO
(b) ZnO
(c) CoO
(d) FeO
Answer
Answer: (b) ZnO
Question 14.
Which of the following oxides in acidic in nature?
(a) CrO
(b) Cr2O3
(c) CrO3
(d) CrO2
Answer
Answer: (c) CrO3
Question 15.
The equivalent mass of K2Cr2O7, when it acts as oxidising agent in acidic medium, is equal to
(a) M
(b) M/2
(c) M/6
(d) M/5
Answer
Answer: (c) M/6
Question 16.
Rutile is an ore of
(a) Scandium
(b) Titanium
(c) Manganese
(d) Chromium
Answer
Answer: (b) Titanium
Question 17.
If two compounds have the same crystal structure and analogous formula, they are called
(a) Isomers
(b) Isotopes
(c) Isobars
(d) Isomorphous.
Answer
Answer: (d) Isomorphous.
Question 18.
Which of the following would be diamagnetic?
(a) Cu2+
(b) Ni2+
(c) Cd2+
(d) Ti3+.
Answer
Answer: (c) Cd2+
Question 19.
Which of the following would be paramagnetic?
(a) Zn2+
(b) Cu+
(c) Sc3+
(d) Mn2+
Answer
Answer: (d) Mn2+
Question 20.
Which of the following is likely to form white salts?
(a) Cu2+
(b) Sc3+
(c) Ti3+
(d) Fe3+.
Answer
Answer: (b) Sc3+
Question 21.
Which of the following is not an actinide?
(a) curium
(b) californium.
(c) uranium
(d) turbium.
Answer
Answer: (d) turbium.
Question 22.
Least paramagnetic property is shown by
(a) Fe
(b) Mn
(c) Ni
(d) Cu
Answer
Answer: (d) Cu
Question 23.
Vanadium (III) oxide is a strong
(a) Drying agent
(b) Oxidizing agent
(c) Reducing agent
(d) Witting agent
(e) Precipiting agent.
Answer
Answer: (c) Reducing agent
Question 24.
The aqueous solution containing which one of the following ions will be colourless?
(a) Fe2+
(b) Mn2+
(c) Ti3+
(d) Sc3+
Answer
Answer: (d) Sc3+
Question 25.
The value of’spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is
(a) d4 (in strong ligand field)
(b) d4 (in weak ligand field)
(c) d³ (in weak as well as strong fields)
(d) d5 (in strong ligand field)
Answer
Answer: (a) d4 (in strong ligand field)
Question 26.
Which of the following factor may be regarded as the main cause of lanthanide contraction?
(a) Poor shielding of one of the 4f-electrons by another in the subshell.
(b) Effective shielding of one of the 4f-electrons by another in the subshell.
(c) Poorer shielding of 5d electrons by 4f electrons.
(d) Greater shielding of 5d electrons by 4f electrons.
Answer
Answer: (a) Poor shielding of one of the 4f-electrons by another in the subshell.
Question 27.
Among the following pairs of ions the lower oxidation state in aqueous solution is more stable than the other.
(a) Tl+, Tl3+
(b) Cu+, Cu2+
(c) Cr2+, Cr3+
(d) V2+, VO2+.
Answer
Answer: (a) Tl+, Tl3+
Question 28.
Lanthanides and actinides resemble in
(a) electronic configuration
(b) oxidation state
(c) ionisation energy
(d) formation of complexes.
Answer
Answer: (b) oxidation state
Question 29.
For decolorization of 1 Mole of KMnO4, the moles of H2O2 required
(a) \(\frac {1}{2}\)
(b) \(\frac {3}{2}\)
(c) \(\frac {5}{2}\)
(d) \(\frac {7}{2}\)
Answer
Answer: (c) \(\frac {5}{2}\)
Question 30.
In a given shell, The order of screening effect is
(a) s > p > d > f
(b) f > d > p > s
(c) p < d < s < f
(d) f > p > s > d
Answer
Answer: (a) s > p > d > f
Question 31.
Cesium (Z = 58) is an important member of the lanthanoids. Which of the following statement about cesium is incorrect?
(a) The common oxidation states of cesium are + 3 and + 4.
(b) The + 3 oxidation state of cesium is more stable than + 4 oxidation state.
(c) The + 4 oxidation state of cesium is not known in solutions.
(d) Cesium (IV) acts as an oxidizing agent.
Answer
Answer: (c) The + 4 oxidation state of cesium is not known in solutions.
Question 32.
The product of oxidation of I– with MnO4– in alkaline solution is
(a) IO3–
(b) I2
(c) IO–
(d) IO4–
Answer
Answer: (a) IO3–
Question 33.
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 ionisation enthalpy?
(a) Vanadium (Z = 21)
(b) Manganese (Z = 25)
(c) Chromium (Z = 24)
(d) Iron (Z = 26)
Answer
Answer: (b) Manganese (Z = 25)
Question 34.
MnO42- (1 mole) in neutral solution (aqueous) disporportionates to
(a) \(\frac {2}{3}\) mole of MnO4– and \(\frac {1}{3}\) mole of MnO2
(b) \(\frac {1}{3}\) mole of MnO4– and \(\frac {2}{3}\) mole of MnO2
(c) \(\frac {1}{3}\) mole of Mn2O7 and \(\frac {1}{3}\) mole of MnO2
(d) \(\frac {2}{3}\) mole of Mn2O7 and \(\frac {1}{3}\) mole of MnO2
Answer
Answer: (a) \(\frac {2}{3}\) mole of MnO4– and \(\frac {1}{3}\) mole of MnO2
Question 35.
The radius of La3+ (At. No. of La = 57) is 1.06 A°. Which one of the following given values will be closest to the radius of Lu3+.
(a) 1.40 Å
(b) 1.06 Å
(c) 0.85 Å
(d) 1.60 Å
Answer
Answer: (c) 0.85 Å
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