Class 12 Chemistry Chapter 8 the d and f Block Elements MCQs | Class 12 Chemistry Chapter 8 the d and f Block Elements Multiple Choice Questions (MCQs) and Answers

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Questions
1 Which of the following products are obtained when Na2CO3 is added to a solution of copper sulphate?
A Basic copper carbonate , sodium sulphate and CO2
B Copper hydroxide, sodium sulphate and CO2
C Copper carbonate, sodium sulphate and CO2
D Copper carbonate and sodium sulphate

Answer:Copper carbonate and sodium sulphate
2 The pair that has similar atomic radii is
A Mn and Re
B Ti and Hf
C Sc and Ni
D Mo and W

Answer:Mo and W
3 Silver nitrate produces a black stain on the skin due to
A being a strong reducing agent
B its corrosive action
C formation of complex compound
D its reduction to metallic silver

Answer: its reduction to metallic silver
4 According to IUPAC nomenclature sodium nitroprusside dihydrate is named as
A Sodium pentacyanonitrosylferrate (III)
B Sodium nitroferrocyanide
C Sodium nitroferricyanide
D Sodium pentacyanonitrosylferrate (II)

Answer: Sodium pentacyanonitrosylferrate (III)
5 In Fe(CO)5, the Fe-C bond possesses:
A ionic character
B sigma character only
C pi character
D both sigma and pi characters

Answer: both sigma and pi characters
6 The number of unpaired electrons in gaseous species of Mn3+, Cr3+ and V3+ respectively are:
A 4, 4 and 2
B 3, 3 and 2
C 4, 3 and 2
D 3, 3 and 3

Answer:4, 3 and 2
7 Gun metal is an alloy of:
A Cu and Al
B Cu and Sn
C Cu, Zn and Sn
D Cu, Zn and Ni

Answer:Cu, Zn and Sn
8 Which one of the following elements shows the maximum number of different oxidation states in its compounds?
A Eu
B La
C Cd
D Am

Answer:Am
9 When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is
A sulphur dioxide
B ammonia
C carbon monoxide
D carbon dioxide

Answer:carbon monoxide
10 Zinc and mercury do not show variable valency like d-block elements because
A they are soft
B their d-shells are complete
C they have only two electrons in the outermost subshell
D their d-shells are incomplete

Answer:their d-shells are complete
11 Which groups of elements are called d-block elements in modern periodic table ?
A 1 to 2
B 3 to 10
C 3 to 12
D 13 to 18

Answer:3 to 12
12 Which block elements are more electropositive in modern periodic table ?
A s
B p
C d
D f

Answer:s
13 Which block elements are less electropositive in modern periodic table ?
A s
B p
C d
D f

Answer: p
14 Which elements transist between more electropositive and less electropositive elements ?
A s
B p
C d
D f

Answer:d
15 In modern periodic table, by which name d-block elements are known ?
A More electropositive elementsr
B Less electropositive elements
C Transition elements
D Inner transition elements

Answer:Transition elements
16 Which of the following is an electronic configuration at Th ?
A [Rn] 5f o 6d2 7s2
B [Rn] 5f 2 6d2 7s2
C [Rn] 5f 2 6d2 7so
D [Rn] 5f' 6d2 7so

Answer: [Rn] 5f o 6d2 7s2
17 By which reason, element -Th is introduce in f-block ?
A According to electronic configuration
B According to physical properties
C According to chemical properties
D According to practical properties

Answer: According to practical properties
18 When d-block elements are consider as d-block elements ?
A d-orbital is fully filled in ground state
B d-orbital is half filled in ground state
C d-orbital is fully filled in all oxidation states
D d-orbital is fully filled in only anyone oxidation state

Answer:d-orbital is half filled in ground state
19 Which of the following elements are first transition element ?
A Ac, Rt
B Ac, Re
C Rf, La
D Y, Rf

Answer: Ac, Rt
20 Which of the following does not considered as transition element ?
A Cd
B Pd
C Ag
D Ru

Answer: Cd

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