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d- and f-Block Elements

220 questions in 7 topics. 44 NEET level, 88 JEE Main, 88 JEE Advanced. Every question was written for this chapter and solved independently a second time before publication.

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Electronic configuration and general trends of transition metals 28

The ground-state electronic configuration of chromium (Z = 24) is
Among the following elements, the one that is NOT a transition element by the IUPAC definition (an element hav...
The spin-only magnetic moment of Fe^3+ (Z = 26) is closest to
Which of the following aqueous ions is colourless?
Among Ti, Cr, Mn and Fe, the metal that shows the highest oxidation state in its compounds is
Which of the following ions is diamagnetic?
Among Cr, Mn, Fe and Ni, the standard electrode potential E deg(M^2+/M) is most negative for
Assertion (A): Mn^2+ does not get oxidised to Mn^3+ in aqueous solution, as E deg(Mn^3+/Mn^2+) = +1.5 V. Reaso...
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Catalytic properties and interstitial compounds 27

In the industrial Haber process for ammonia, the usual catalyst is
The catalyst used in the contact process for the manufacture of sulphuric acid is
Which statement about interstitial compounds of transition metals is correct?
A Ziegler-Natta catalyst, used for low-pressure polymerisation of ethene, is a combination of
Finely divided nickel is used industrially as a catalyst for
In the contact process, 2SO2 + O2 -> 2SO3 over a V2O5 catalyst with excess O2. If 25.6 g of SO2 is converted w...
In the contact process the catalyst acts by the steps V2O5 + SO2 -> V2O4 + SO3 and 2V2O4 + O2 -> 2V2O5. The ox...
Which of the following is an interstitial compound?
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Oxidation states and standard electrode potentials 27

The maximum oxidation state shown by manganese in its compounds is
The oxidation state of chromium in K2Cr2O7 is
Among the following 3d elements, the one that shows only a single non-zero oxidation state in its compounds is
The oxidation state of manganese in the green compound K2MnO4 is
Among the following couples, the only one with a positive standard reduction potential is
Given E deg(Cu^+/Cu) = +0.52 V and E deg(Cu^2+/Cu^+) = +0.16 V, which statement about Cu^+ in aqueous solution...
Among the following aqueous ions, the one with the highest spin-only magnetic moment is
Assertion (A): Mn^3+ is a much stronger oxidising agent than Fe^3+ in aqueous solution. Reason (R): Reduction ...
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Important compounds: KMnO4 and K2Cr2O7 28

The green colour of potassium manganate is due to the presence of the ion
In acidic medium, MnO4^- is finally reduced to
On adding aqueous sodium hydroxide to orange potassium dichromate solution, the solution turns
The principal ore from which potassium permanganate is manufactured is
The ore used for the commercial preparation of potassium dichromate is
For titrating Fe^2+ against KMnO4, the medium used is acidified with
When KMnO4 oxidises potassium iodide in a neutral or weakly alkaline medium, the iodine-containing product is
How many moles of Fe^2+ are oxidised to Fe^3+ by one mole of Cr2O7^2- in acidic solution?
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Colour and magnetic properties 55

Which of the following ions is colourless in aqueous solution?
The spin-only magnetic moment of Cu^2+ (Z = 29) is, using mu = sqrtn(n+2) BM:
The number of unpaired electrons in Mn^2+ (Z = 25) is:
Which of the following ions is diamagnetic?
The intense purple colour of aqueous KMnO4 is due to:
Compounds of transition metals are generally coloured mainly because of:
The colour of aqueous potassium chromate, K2CrO4, is:
Paramagnetism of a substance is due to the presence of:
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Lanthanoids and lanthanoid contraction 28

The electrons that are added progressively on moving from Ce to Lu enter the
The most common and characteristic oxidation state of the lanthanoids is
Lanthanoid contraction is mainly caused by
Among the following, the lanthanoid that commonly shows the +4 oxidation state in addition to +3 is
Misch metal, an alloy used in making flints and in alloy steels, consists mostly of lanthanoid metals together...
Among the following aqueous tripositive ions, the one that is colourless is
In acidic solution Ce^4+ is a strong oxidising agent even though it has the stable 4f^0 configuration. The bes...
Aqueous Eu^2+ (4f^7) slowly reduces H^+ in dilute acid. The balanced ionic equation with the product in its ch...
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Actinoids 27

In the usual classification (the fourteen elements that follow actinium), the last member of the actinoid seri...
Which of the following is true of every actinoid element?
Among the following actinoids, the one that is known to exhibit the highest oxidation state of +7 is
Actinoids show a wider range of oxidation states than lanthanoids mainly because
Which of the following is an actinoid?
The decrease in size across the actinoid series is, element to element, greater than that across the lanthanoi...
Assertion (A): Early actinoids show a greater range of oxidation states than the corresponding lanthanoids. Re...
Among the following actinoids, the one whose most stable oxidation state is +4 rather than +3 is
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