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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

(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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