Class 12 Chemistry Chapter 8 the d and f Block Elements MCQs | Class 12 Chemistry Chapter 8 the d and f Block Elements Short Questions and Answers

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Questions
1 Which of following Lanthanide element has +2 and +3 general oxidation state.
A La
B Nd
C Ce
D Eu

Answer:Eu
2 Which of following compound is coloured ?
A TiCl3
B FeCl3
C CoCl2
D All above

Answer: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

Answer: 0%
6 Which of similarity is seen in Lanthanoids & actinides ?
A Electronic configuration
B Oxidation states
C Ionisation energy
D Formation of complexes

Answer:Oxidation states
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

Answer: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

Answer:28
11 Which of canthanide element show +2 and +3 oxidation state ?
A La
B Nd
C Ce
D Eu

Answer: 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

Answer:f-Block
15 Which of aqueous solution is coloured ?
A Zn (NO3)2
B LiNO3
C Co (NO3)2
D Potash Alum

Answer:Co (NO3)2

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