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Free download in PDF Class 12 Chemistry Chapter 8 the d and f Block Elements Short Questions 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 following Lanthanide element has +2 and +3 general oxidation state.
[A]
La
[B]
Nd
[C]
Ce
[D]
Eu
(2)
Which of following compound is coloured ?
[A]
TiCl3
[B]
FeCl3
[C]
CoCl2
[D]
All above
(3)
Which of following statement is correct for transition elements ?
[A]
They are very active
[B]
They show variable valencies
[C]
They show lower melting point
[D]
They are stong electropositive elements
Answer: They show variable valencies
(4)
A element having atomic no. 56 is included in
[A]
Lanthanides
[B]
Actindies
[C]
Alkaline earth metals
[D]
None of above
Answer: Alkaline earth metals
(5)
What is percentage proportion of silver in german silver ?
[A]
0%
[B]
1%
[C]
5%
[D]
None of above
(6)
Which of similarity is seen in Lanthanoids & actinides ?
[A]
Electronic configuration
[B]
Oxidation states
[C]
Ionisation energy
[D]
Formation of complexes
(7)
Which of following is use of potassium dichromate ?
[A]
To oxidise ferrous ions into ferric ions in acidic medium as an oxidizing agent
[B]
As an insecticide
[C]
In electroplating
[D]
As a reducing agent
Answer: To oxidise ferrous ions into ferric ions in acidic medium as an oxidizing agent
(8)
Which of Lanthanide compound is used in pigment ?
[A]
Tb (OH) 3
[B]
Lu (OH)3
[C]
Ce (OH)3
[D]
CeO2
(9)
On which factor, does the stability of an oxidation state in lanthanide elements depend ?
[A]
Combined effect of hyadration energy and ionization energy
[B]
Electronic configuration
[C]
Enthalpy
[D]
Internal energy
Answer: Combined effect of hyadration energy and ionization energy
(10)
What is the atomic number of the element with M2+ ion having electronic configuration [Ar] 3d8
[A]
26
[B]
27
[C]
28
[D]
25
(11)
Which of canthanide element show +2 and +3 oxidation state ?
[A]
La
[B]
Nd
[C]
Ce
[D]
Eu
(12)
Which of following is correct order of ionic radii of Y+3, La3+, Eu3+, Lu3+ ?
[A]
Y3+ , < La3+ , < Eu3+ , > Lu3+
[B]
Y3+ , < Lu3+ , < Eu3+ , < La3+
[C]
Lu3+ , < Eu3+ , < La3+ , < Y3+
[D]
La3+ , < Eu3+ , < Lu+3 , < Y3+
Answer: Lu3+ , < Eu3+ , < La3+ , < Y3+
(13)
Lanthanide contraction is observed due to increase in____
[A]
Atomic radii
[B]
Volume of 4f orbital
[C]
Effective nuclear charge
[D]
Atomic number
Answer: Effective nuclear charge
(14)
In _____ elements, atomic volume decrease with increase in atomic number.
[A]
p-Block
[B]
f-Block
[C]
Radioactive series
[D]
Super heavy elements
(15)
Which of aqueous solution is coloured ?
[A]
Zn (NO3)2
[B]
LiNO3
[C]
Co (NO3)2
[D]
Potash Alum
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