The D and F Block Elements MCQs for ISC Class 12 Chemistry

The D and F Block Elements MCQs for ISC Class 12 Chemistry  Sem-2 Exam . These MCQ  / Objective Type Questions is based on latest reduced syllabus according 2021-22 session on bifurcated pattern. Main motto of MCQ Type Question is cracking the next upcoming Sem-2 exam of council. Visit official website CISCE for detail information about ICSE Board Class-12 Chemistry

ISC Class 12 Chemistry The D and F Block Elements MCQs Type Questions with Solutions

Board	ISC
Class	12th (XII)
Subject	Chemistry
Chapter	The D and F Block Elements
Syllabus	on bifurcated syllabus (after reduction)
Session	2021-22
Bifurcated	Sem-2
Topic	MCQ / Objective Type Question

 The D and F Block Elements MCQs Type Questions ISC Class 12 Chemistry with Solutions

Question 1.
The property which is not characteristic of transition metals is
(a) variable oxidation states.
(b) tendency to form complexes.
(c) formation of culoured compounds.
(d) natural radioactivity.

Answer: (d) natural radioactivity.

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: (b) potassium manganate

Question 3.
Whith metal has highest melting point?
(a) Pt
(b) W
(c) Pd
(d) Au

Answer: (b) W

Question 4.
Which metal has lowest melting point?
(a) Cs
(b) Na
(c) Hg
(d) Sn

Answer: (c) Hg

Question 5.
Which is the first man-made element?
(a) Sc
(b) Os
(c) Tc
(d) Zr

Answer: (c) Tc

Question 6
Ag⁺ ion is isoelectric with
(a) OP
(b) Cd²⁺
(c) Zn²⁺
(d) Pd²⁺

Answer: (b) Cd²⁺

Question 7
The transition element with lowest atomic number is
(a) Scandium
(b) Titanium
(c) Zinc
(d) Lanthanum.

Answer: (a) Scandium

Question 8
Which of the following oxides is amphoteric in nature?
(a) NiO
(b) ZnO
(c) CoO
(d) FeO

Answer: (b) ZnO

Question 9
Which of the following oxides in acidic in nature?
(a) CrO
(b) Cr₂O₃
(c) CrO₃
(d) CrO₂

Answer: (c) CrO₃

Question 10.
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: (c) M/6

Question 11.

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⁺

Question 12.
Fe³⁺ ion is more stable than Fe²⁺ ion because
(a) more the charge on the atom, more is its stability
(b) configuration of Fe²⁺ is 3d⁵ while Fe³⁺ is 3d⁵
(c) Fe²⁺ has a larger size than Fe³⁺
(d) Fe³⁺ ions are coloured hence more stable

Answer: (b) configuration of Fe²⁺ is 3d⁵ while Fe³⁺ is 3d⁵

Question 13.
Colour of transition metal ions are due to absorption of some wavelength. This results in
(a) d-s transition
(b) s-s transition
(c) s-t/transition
(d) d-d transition

Answer: (d) d-d transition

Question 14.
Which group contains coloured ions out of the following?
1. Cu^–. 2. Ti^4- 3. Co²⁺ 4. Fe^2-
(a) 1, 2, 3, 4
(b) 3, 4
(c) 2, 3
(4) 1, 2

Answer: (b) 3, 4

Question 15.
The melting points of Cu, Ag and Au follow the order
(a) Cu > Ag > Au
(b) Cu >Au > Ag
(c) Au > Ag > Cu
(d) Ag > Au > Cu

Answer: (b) Cu >Au > Ag

Question 16.
In which of the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other?
(a) Ti⁺, Ti³⁺
(b)Cu⁺, Cu³⁺
(c) Cr²⁺, Cr³⁺
(d) V²⁺, VO²⁺ (V⁴)

Answer: (a) Ti⁺, Ti³⁺

Question 17.
Which of the following pairs of ions have the same electronic configuration?
(a) Cu²⁺, Cr²⁺
(b) Fe³⁺, Mn²⁺
(c) Co³⁺, Ni³⁺
(d) Sc³⁺, Cr³⁺

Answer: (b) Fe³⁺, Mn²⁺

Question 18.
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

Question 19.
Zr and Hf have almost equal atomic and ionic radii because of
(a) diagonal relationship
(b) lanthanoid contraction
(c) actinoid contraction
(d) belonging to the same group

Answer: ((b) lanthanoid contraction

Question 20.
Which of the following is not an amphoteric ion?
(a) Al³⁺
(b) Cr³⁺
(c) Fe³⁺
(d) Zn²⁺

Answer: (c) Fe³⁺

Question 21.
What happens when potassium iodide reacts with acidic solution of potassium dichromate?
(a) It liberates iodine
(b) Potassium sulphate is formed
(c) Chromium sulphate is formed
(d) All the above products are formed

Answer: (d) All the above products are formed

Question 22.
The number of moles of KMnO₄ that are needed to react completely with one mole of ferrous oxalate in acidic solution is
(a) 3/5
(b) 2/5
(c) 4/5
(d) 1

Answer: (a) 3/5

Question 23.
Acidified potassium dichromate reacts with potassium iodide and oxidises it to I₂. What is the oxidation state of chromium in the products of the reaction?
(a) +4
(b) +6
(c) +3
(d) +2

Answer: (c) +3

Question 24.
One mole of acidfied K₂Cr³⁺O on reaction with excess KI will liberate ………….. mole(s) of I₂.
(a) 6
(b) 1
(c) 7
(d) 2

Answer: (a) 6

Question 25
Oxidation number of gold metal is
(a) +1
(b) 0
(c) -1
(d) all of these

Ans:- (a) +1

Question 26.
Shape of d-orbital is
(a) spherical
(b) dumb bell
(c) double dumb bell
(d) none of these

Ans:- (c) double dumb bell

Question 27.
Electronic configuration of alkaline earth element is

(a) ns²
(b) ns¹
(c) np⁶
(d) ns⁰

Ans :- (a) ns²

Question 28.
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

Question 29

Which one of the following is called green vitriol?
(a) FeSO₄ 7H₂O
(b) CuSO₄ 5H₂O
(c) CaSO₄ 2H₂O
(d) None of these

Answer: (a) FeSO₄ 7H₂O
Question 30
Which block of elements are known as transition elements?
(a) p-block
(b) s-block
(c) d-block
(d) f-bloc

Answer: (c) d-block

Question 31
Most abundant element in earth’s crust is
(a) Si
(b) Al
(c) Zn
(d) Fe

Answer: (a) Si

Question 32
Which one of the following is diamagnetic ion?
(a) Co²⁺
(b) Ni²⁺
(c) Cu²⁺
(d) Zn²⁺

Answer: (d) Zn²⁺

Question 33
Which of the following is not an element of first transition series?
(a) Iron
(b) Chromium
(c) Magnesium
(d) Nickel

Answer: (c) Magnesium

Question 34
The correct order of E0 𝑀2+/𝑀 values with negative sign for the four successive elements Cr, Mn, Fe and Co is
(a) Fe > Mn > Cr > Co
(b) Cr > Mn > Fe > Co
(c) Mn > Cr > Fe > Co
(d) Cr > Fe > Mn > Co

Answer: (c) Mn > Cr > Fe > Co

Question 35.
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: (a) d⁴ (in strong ligand field)

Question 36.
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: (a) Poor shielding of one of the 4f-electrons by another in the subshell.

Question 37
Lanthanides and actinides resemble in
(a) electronic configuration
(b) oxidation state
(c) ionization energy
(d) formation of complexes.

Answer: (b) oxidation state

Question 38
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: (c) The + 4 oxidation state of cesium is not known in solutions.

Question 39.
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: (b) Manganese (Z = 25)

Question- 40. 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

Ans:- (d) Variable oxidation states

–: End of The D and F Block Elements MCQs for ISC Class 12   :–

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