Preparing for JEE Main can be challenging, especially when it comes to topics like d and f block elements. These chapters are important in the Chemistry syllabus and often feature tricky questions. To help students, we have compiled JEE Main d and f block previous year questions with solutions. Practicing these questions will give you a clear understanding of the topic, help you identify patterns, and improve your problem-solving speed. Whether you’re revising or preparing for the first time, solving these questions is a smart step towards scoring better in the exam.
1. Copper becomes green when exposed to moist air for a long period. This is due to:-
(1) the formation of a layer of cupric oxide on the surface of copper.
(2) the formation of a basic copper sulphate layer on the surface of the metal
(3) the formation of a layer of cupric hydroxide on the surface of copper.
(4) the formation of a layer of basic carbonate of copper on the surface of copper.
Solution:
The correct option for the given question is (4)
2. Which one of the following exhibits the largest number of oxidation states?
(1) Mn(25)
(2) V(23)
(3) Cr (24)
(4) Ti (22)
Solution:
The correct option for the given question is (1)
3. The type of isomerism present in nitro- pentamine chromium (III) chloride is
(1) optical
(2) linkage
(3) ionization
(4) polymerisation
Solution:
The correct option for the given question is (2)
4. Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect?
(1) Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds.
(2) Ferrous oxide is more basic in nature than ferric oxide.
(3) Ferrous compounds are relatively more ionic than the corresponding ferric compounds.
(4) Ferrous compounds are less volatile than the corresponding ferric compounds.
Solution:
The correct option for the given question is (1)
5. Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of:
(1) CrO3
(2) Cr2O3
(3) CrCl3
(4) CrO2Cl2
Solution:
The correct option for the given question is (4)
6. The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because
(1) the 5f orbitals extend further from the nucleus than the 4f orbitals
(2) the 5f orbitals are more buried than the 4f orbitals
(3) there is a similarity between 4f and 5f orbitals in their angular part of the wave function
(4) the actinoids are more reactive than the lanthanoids.
Solution:
The correct option for the given question is (1)
7. Which of the following is not formed when H2S reacts with acidic K2Cr2O7 solution?
(1) K2SO4
(2) Cr2(SO4)3
(3) S
(4) CrSO4
Solution:
The correct option for the given question is (4)
8. The lanthanide contraction is responsible for the fact that
(1) Zr and Y have about the same radius
(2) Zr and Nb have a similar oxidation state
(3) Zr and Hf have about the same radius
(4) Zr and Zn have the same oxidation state.
Solution:
The correct option for the given question is (3)
9. Which of the following statements is false?
(1) has a Cr – O – Cr bond
(2) is tetrahedral in shape
(3) Na2Cr2O7 is a primary standard in volumetry
(4) Na2Cr2O7 is less soluble than K2Cr2O7
Solution:
The correct option for the given question is (4) and (3)
10. In context with the transition elements, which of the following statements is incorrect?
(1) In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s
and 3d electrons are used for bonding.
(2) Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in
bonding decreases.
(3) In addition to the normal oxidation states, the zero oxidation state is also shown by these
elements in complexes.
(4) In the highest oxidation states, the transition metal show basic character and form cationic
complexes.
Solution:
The correct option for the given question is (4)
11. The element that usually does not show variable oxidation states is
(a) V
(b) Ti
(c) Cu
(d) Sc
Solution:
The correct option for the given question is (4)
12. The pair that has similar atomic radii is
(1) Mn and Re
(2) Ti and Hf
(3) Sc and Ni
(4) Mo and W
Solution:
The correct option for the given question is (4)
13. In the context of the lanthanoids, which of the following statement is not correct?
(1) There is a gradual decrease in the radii of the members with increasing atomic number in the series.
(2) All the members exhibit a +3 oxidation state.
(3) Because of similar properties, the separation of lanthanoids is not easy.
(4) Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.
Solution:
The correct option for the given question is (4)
14. Heating mixture of Cu2O and Cu2S will give
(a) Cu + SO2
(b) Cu + SO3
(c) CuO + CuS
(d) Cu2SO3
Solution:
The correct option for the given question is (1)
15. Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
(1) Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character.
(2) The ionic sizes of Ln(III) decrease in general with increasing atomic number.
(3) Ln(III) compounds are generally colourless.
(4) Ln(III) hydroxides are mainly basic in character.
Solution:
The correct option for the given question is (3)
Q. What are the overall properties of the d-block components?
Ans: The properties of the d-block components are as per the following;
Q. What are the properties of lanthanides?
Ans: The properties of the lanthanides are given beneath;
It is to be noticed that all the progress components have, metallic nature and every one of them comprises of basic ccp hcp or bcc grids. they have solid metallic bonds attributable to their more prominent viable atomic charge and furthermore on the grounds that they have enormous quantities of valence electrons. They are considered hard to have high densities. The presence of free electrons makes them great transmitters of hotness and power.
