MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements Part-1 with Answers

The d-and f-Block Elements Part-1 Class 12 Chemistry MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. We have Provided The d-and f-Block Elements Part-1 Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well.

Class 12 Chemistry Chapter 8 Quiz

Class 12 Chemistry Chapter 8 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Chemistry Chapter 8 The d-and f-Block Elements Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

The d-and f-Block Elements Part-1 Class 12 Chemistry MCQ online test

Q1.	Oxidation number of gold metal is
	A.+1
	B.0
	C.-1
	D.all of these

Ans: +1

Q2.	Shape of d-orbital is
	A.spherical
	B.dumb bell
	C.double dumb bell
	D.none of these

Ans: double dumb bell

Q3.	Electronic configuration of alkaline earth element is
	A.ns²
	B.ns¹
	C.np⁶
	D.ns⁰

Ans: ns²

Q4.	Lanthanoid contraction is due to increase in
	A.atomic number
	B.effective nuclear charge
	C.atomic radius
	D.valence electrons

Ans: effective nuclear charge

Q5.	Which one of the following is called green vitriol?
	A.FeSO₄ 7H₂O
	B.CuSO₄ 5H₂O
	C.CaSO₄ 2H₂O
	D.None of these

Ans: FeSO₄ 7H₂O

Q6.	Which block of elements are known as transition elements?
	A.p-block
	B.s-block
	C.d-block
	D.f-block

Ans: d-block

Q7.	Most abundant element in earth’s crust is
	A.Si
	B.Al
	C.Zn
	D.Fe

Ans: Si

Q8.	Which one of the following is diamagnetic ion?
	A.Co²⁺
	B.Ni²⁺
	C.Cu²⁺
	D.Zn²⁺

Ans: Zn²⁺

Q9.	Which of the following is not an element of first transition series?
	A.Iron
	B.Chromium
	C.Magnesium
	D.Nickel

Ans: Magnesium

Q10.	The correct order of E\(_{0}^{M^{2+}/M}\) 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

Ans: Mn > Cr > Fe > Co

Q11.	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⁺

Ans: 4, 3 and 2; Cr³⁺

Q12.	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

Ans: configuration of Fe²⁺ is 3d⁵ while Fe³⁺ is 3d⁵

Q13.	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

Ans: d-d transition

Q14.	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
	D.1, 2

Ans: 3, 4

Q15.	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

Ans: Cu >Au > Ag

Q16.	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)

Ans: Ti⁺, Ti³⁺

Q17.	Which of the following pairs of ions have the same electronic configuration?
	A.Cu²⁺, Cr²⁺
	B.Fe³⁺, Mn²⁺
	C.Co³⁺, Ni³⁺
	D.Sc³⁺, Cr³⁺

Ans: Fe³⁺, Mn²⁺

Q18.	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

Ans: the electrons of copper are involved in metallic bonding

Q19.	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