Are these practice questions for The D-and F-Block Elements based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 12 - Science Chemistry exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for The D-and F-Block Elements free?

Yes. Every chapter includes free practice questions for Class 12 - Science students to get you started.

What types of questions are included?

The practice set for The D-and F-Block Elements mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for The D-and F-Block Elements for full coverage.

How many practice questions are there for The D-and F-Block Elements?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

The D-and F-Block Elements Class 12 Chemistry Practice Questions with Answers

easy

List four general characteristic properties of transition elements.

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easy

Identify the element in the 3d series that exhibits the largest number of oxidation states.

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easy

Justify why an aqueous solution of

Zn^{2+}

ions is colourless.

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easy

Manganese (

Z=25

) is known to exhibit the largest number of oxidation states among the first-row transition elements. Justify this observation based on its electronic configuration.

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easy

Define transition elements according to the IUPAC definition.

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easy

Justify why a transition metal exhibits its highest oxidation state in its compounds with oxygen and fluorine.

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easy

Name the oxometal anion of manganese where the metal is in its highest oxidation state (+7).

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easy

Name the two series of inner transition elements.

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easy

Recall the formula used to calculate the 'spin-only' magnetic moment and its unit.

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easy

Examine the primary reasons why transition metals are known for forming a large number of complex compounds.

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medium

Critique the statement 'The chemistry of actinoids is very similar to that of lanthanoids.' Justify your answer by comparing their range of oxidation states and chemical reactivity.

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medium

Analyze why transition metals exhibit high enthalpies of atomisation.

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medium

Formulate the balanced ionic equations for the oxidation of (i) iron(II) ions and (ii) oxalate ions by acidified potassium permanganate (

KMnO_4

). Justify the essential role of the acidic medium.

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medium

Explain the interconversion of chromate (

CrO_4^{2-}

) and dichromate (

Cr_2O_7^{2-}

) ions in aqueous solution.

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medium

Analyze the interconversion of chromate and dichromate ions in an aqueous solution as the pH is altered. Provide the balanced ionic equations for the reactions.

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medium

Calculate the 'spin-only' magnetic moment for a divalent ion of an element with atomic number

Z = 27

.

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medium

Describe why most transition metal ions are coloured, whereas ions of s-block and p-block elements are generally colourless.

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medium

Contrast the chemical reactivity and oxidation states of lanthanoids with those of actinoids.

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medium

Calculate the 'spin-only' magnetic moment for the

\text{Fe}^{2+}

ion in Bohr Magnetons (BM). The atomic number of Iron (Fe) is 26.

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medium

Explain why Zinc (

Z=30

) is not regarded as a transition element.

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medium

Formulate a justification for the anomalous electronic configurations of Chromium (

Z=24

) and Copper (

Z=29

), evaluating the energetic factors that favour these configurations over the expected ones.

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medium

Analyze why Zinc (Zn), Cadmium (Cd), and Mercury (Hg) are generally not considered as transition metals, even though they belong to the d-block of the periodic table.

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medium

Define interstitial compounds and list two of their properties.

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medium

Evaluate the characteristic properties of interstitial compounds formed by transition metals, such as high melting points and chemical inertness, and propose a structural reason for them.

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medium

Evaluate the trend in enthalpies of atomisation across the 3d transition series and justify why Zinc has the lowest value (

126 \text{ kJ mol}^{-1}

).

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medium

Define 'lanthanoid contraction' and name one of its major consequences.

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medium

Recall the anomalous electronic configurations of Chromium (

Cr, Z=24

) and Copper (

Cu, Z=29

) in the 3d series.

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medium

Demonstrate how the formation of colored ions by transition elements can be explained using the concept of d-d transition, with

\text{Ti}^{3+}_{(\text{aq})}

as an example.

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medium

Describe the key differences between lanthanoids and actinoids regarding their oxidation states and chemical reactivity.

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medium

Actinoid contraction is greater from element to element than lanthanoid contraction. Propose a reason for this observation based on the nature of f-orbitals.

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medium

Critique the statement: 'The first ionisation enthalpy of the 3d transition elements increases regularly across the series.' Justify your position with specific examples.

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medium

Propose a method to determine the number of unpaired electrons in a

Co^{2+}

ion. Calculate its 'spin-only' magnetic moment and justify why experimental values might differ from the calculated value.

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medium

Apply the concept of orbital stability to explain the anomalous electronic configurations of Chromium (

Z=24

) and Copper (

Z=29

).

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hard

Analyze why the

\text{Cu}^+

ion is not stable in aqueous solutions and tends to undergo disproportionation.

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hard

Compare the ability of oxygen and fluorine to stabilize the highest oxidation states of transition metals. Analyze why oxygen is sometimes superior in this regard.

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hard

Explain why the enthalpies of atomisation of transition metals are high.

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hard

Propose a detailed explanation for the phenomenon of Lanthanoid contraction and evaluate its primary consequences on the properties of the 5d series elements.

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hard

Apply your knowledge of standard electrode potentials to analyze which ion,

\text{Cr}^{2+}

or

\text{Fe}^{2+}

, is a stronger reducing agent and why. Given:

E^\circ_{\text{Cr}^{3+}/\text{Cr}^{2+}} = -0.41 \text{ V}

and

E^\circ_{\text{Fe}^{3+}/\text{Fe}^{2+}} = +0.77 \text{ V}

.

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hard

Analyze the trends in the first and second ionization enthalpies of Chromium (

Z=24

) and Zinc (

Z=30

).

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hard

Critique the IUPAC definition of a transition metal by evaluating why Zinc (

Z=30

) is not considered one, while Silver (

Z=47

) is, despite both having a completely filled d-orbital in their ground state.

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hard

Examine the redox reaction that occurs when acidified potassium permanganate solution is added to an aqueous solution of ferrous sulfate. Write the balanced ionic equation and identify the oxidizing and reducing agents.

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hard

Compare the atomic radii of the elements in the second (4d) and third (5d) transition series. Analyze the reason for the observed trend.

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hard

Summarize the preparation of potassium dichromate (

K_2Cr_2O_7

) from chromite ore (

FeCr_2O_4

).

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hard

Evaluate the standard electrode potentials (

E^{\circ}

) for the

M^{2+}/M

couple of Manganese, Nickel, and Zinc. Justify why their values are more negative than expected from the general trend across the 3d series.

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hard

Design an experimental outline to demonstrate the catalytic activity of iron(III) ions in the reaction between iodide ions (

I^−

) and persulphate ions (

S_2O_8^{2−}

). Propose a plausible two-step mechanism for this catalysis.

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The D-and F-Block ElementsClass 12 Chemistry Practice Questions