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d-and f-Block Elements - ISC Class 12 Chemistry Questions with Answers

50 past-paper questions on d-and f-Block Elements from ISC Class 12 Chemistry papers (2027-2018), newest first. Open one to see its answer.

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Answer the following questions: Complete and balance the following chemical equation… 2027 · 3 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [methyl alcohol, ethyl alcohol, paired… 2027 · 1 mark · Fill in
Substantiate the following statements with reasons. Cobalt is attracted in a magnetic field whereas Zinc is not. (Atomic number… 2027 · 2 marks · Short answer
Answer the following: Complete and balance the following reactions: (a)… 2026 · 3 marks · Short answer
Complete and balance the following equations: (a)… 2026 · 3 marks · Short answer
When $\text{H}_2\text{S}$ gas is passed through acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution, the colour of the solution… 2026 · 1 mark · MCQ
Complete and balance the following reactions: (a)… 2026 · 3 marks · Short answer
Account for the following: $\text{Co}^{2+}$ readily loses one electron whereas $\text{Mn}^{3+}$ readily gains one electron… 2026 · 2 marks · Short answer
Which one of the following properties of transition metals enables them to behave as catalysts? 2026 · 1 mark · MCQ
Answer the following: Why is the first ionisation enthalpy of chromium less than that of zinc? (Atomic Number of $\text{Cr} = 24$… 2026 · 2 marks · Short answer
Answer the following: Which divalent metal ion in weak field ligand has maximum paramagnetic character among the first transition… 2026 · 2 marks · Short answer
Answer the following: Give a reason: Transition elements show high melting point. Give a reason: Though $\text{Zr}$ ($Z = 40$)… 2025 · 5 marks · Short answer
Give a reason for each of the following: (a) The purple colour of $\text{KMnO}_4$ disappears in the presence of acidified… 2025 · 5 marks · Short answer
The $\text{Zr}$-$\text{Hf}$ pair of elements has the same value of atomic radii though $\text{Zr}$ and $\text{Hf}$ are placed in… 2025 · 1 mark · Assertion-reason
Give a reason for the following: $\text{Ti}^{3+}$ salts are coloured whereas $\text{Ti}^{4+}$ salts are colourless. [Given… 2025 · 5 marks · Short answer
Choose the appropriate word(s) from the bracket [+2, ethane, tetrahedral, square planar, zero, dry cell, nickel-cadmium cell… 2025 · 1 mark · Fill in
Transition metals exhibit different oxidation states in their different types of compounds. Due to incompletely filled d-orbitals… 2025 · 3 marks · Short answer
Give reason: d-block elements exhibit larger number of oxidation state than f-block elements. Increase in atomic number does not… 2025 · 2 marks · Short answer
Observe the following graph for ionisation enthalpies of first, second and third transition series. Answer the following… 2025 · 3 marks · Short answer
There is a continuous increase in size among Lanthanoids with an increase in atomic number. Given below are two statements marked… 2025 · 1 mark · Assertion-reason
The orange colour of dichromate solution changes to ____ on heating with an alkali due to the formation of ____ ions. 2025 · 1 mark · Fill in
An element [X] has an outer electronic configuration as $3d^5 4s^2$. The maximum oxidation state and most common oxidising state… 2025 · 1 mark · MCQ
The basic strength of hydroxides of lanthanoids decreases with an increase in their atomic number. Given below are two statements… 2025 · 1 mark · Assertion-reason
Choose the appropriate word(s) from the bracket [ethanol, [Fe(H2O)6]2+, anode, d2sp3, Cannizzaro, reducing, cathode, sp3d2… 2025 · 1 mark · Fill in
Halides of transition elements in higher oxidation states are more covalent. Give reason. 2025 · 2 marks · Short answer
Write equation for the following observations: Potassium permanganate on reaction with potassium iodide in acidic medium releases… 2025 · 2 marks · Short answer
Give a reason for each of the following. Zinc, cadmium and mercury are considered as d-block elements but not regarded as… 2024 · 2 marks · Short answer
Give a reason to explain why transition metals can act as a good catalyst. Scandium ($Z = 21$) does not exhibit variable… 2024 · 2 marks · Short answer
Account for the following: Salts of cuprous ($\text{Cu}^+$) ion are colourless whereas the salts of cupric ($\text{Cu}^{2+}$) ion… 2024 · 2 marks · Short answer
Account for each of the following. Zirconium (Zr) and Hafnium (Hf) are difficult to separate. Salts of Cupric ($\text{Cu}^{2+}$)… 2024 · 2 marks · Short answer
When $\text{KMnO}_4$ is heated with acidified oxalic acid, gas bubbles are evolved. These gas bubbles are evolved due to the… 2024 · 1 mark · MCQ
Why is $\text{Mn}^{2+}$ ion more stable than $\text{Fe}^{2+}$ ion? (Atomic number of $\text{Mn} = 25$ and $\text{Fe} = 26$)… 2024 · 2 marks · Short answer
Give a reason for each of the following: The size of the trivalent cations in Lanthanoid series decreases steadily as the atomic… 2024 · 2 marks · Short answer
Acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution turns green when $\text{Na}_2\text{SO}_3$ is added to it. This is due to… 2024 · 1 mark · MCQ
Give reason for the following: Transition metals form large number of complex compounds. Transition elements show variable… 2023 · 2 marks · Short answer
Complete and balance the following chemical equations: $\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \longrightarrow$… 2023 · 2 marks · Fill in
State a reason for each of the following: $\text{La(OH)}_3$ is more basic than $\text{Lu(OH)}_3$. Transition elements and their… 2023 · 2 marks · Short answer
Complete and balance the following chemical equations: $\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{KI} \rightarrow$ ____ +… 2023 · 2 marks · Fill in
Select and write the correct alternative from the choices given below: An alkyl isocyanide on complete reduction gives: For a… 2023 · 4 marks · Short answer
Why are $\text{Zn}$, $\text{Cd}$ and $\text{Hg}$ not regarded as transition elements? 2023 · 2 marks · Short answer
Give a reason for each of the following: $\text{Cu}^{2+}$ salts are paramagnetic, while $\text{Cu}^+$ salts are diamagnetic… 2023 · 2 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: (two, four, $\text{sec}^{-1}$… 2022 · 3 marks · Fill in
What is the basic difference between the electronic configuration of transition and inner transition elements? Why are… 2022 · 3 marks · Short answer
Explain the following: Transition metals and their compounds generally exhibit a paramagnetic behaviour. There is an increase in… 2020 · 3 marks · Short answer
Complete and balance the following chemical equations… 2019 · 3 marks · Fill in
Explain why: Transition elements form alloys. $\text{Zn}^{2+}$ salts are white whereas $\text{Cu}^{2+}$ salts are coloured… 2019 · 3 marks · Short answer
Explain why: $\text{Mn}^{2+}$ is more stable than $\text{Fe}^{2+}$ towards oxidation to $+3$ state. (At. no. of $\text{Mn} = 25$… 2018 · 3 marks · Short answer
Complete and balance the following chemical equations: $\text{KMnO}_4 + \text{KI} + \text{H}_2\text{SO}_4 \rightarrow$ _____ +… 2018 · 3 marks · Fill in
Account for the following/Explain why: Transition metals exhibit variable oxidation states. $\text{Zr}$ ($Z = 40$) and… 2018 · 3 marks · Short answer
Complete the following chemical equations: $\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \rightarrow$… 2018 · 3 marks · Fill in

d-and f-Block Elements - ISC Class 12 Chemistry Questions with Answers

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