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Free download in PDF Class 12 Chemistry Chapter 8 the d and f Block Elements Multiple Choice Questions (MCQs) and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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
(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
(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
(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
(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
(12)
Which block elements are more electropositive in modern periodic table ?
(13)
Which block elements are less electropositive in modern periodic table ?
(14)
Which elements transist between more electropositive and less electropositive elements ?
(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
(20)
Which of the following does not considered as transition element ?
[A]
Cd
[B]
Pd
[C]
Ag
[D]
Ru
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