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NEET d and f Block Elements PYQs with Solutions

869 previous year questions from d and f Block Elements (NEET UG Chemistry) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

869 questionsChemistry2001–2026Answers + solutions

About d and f Block Elements PYQs

d and f Block Elements has 869 previous year questions in the Quantrex Academy NEET UG Chemistry bank. The 220 questions in this list come from NEET (149), AIIMS (49) and JIPMER (22), spanning 2001 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

NEET d and f Block Elements PYQs with Solutions

About d and f Block Elements PYQs

Questions by year (this list)

d and f Block Elements questions with solutions

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because :

The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce =58 , Nd =60 , Tb =65 and Ho =67 )

The green paramagnetic species formed by heating KMnO _4 at 513 K is

The calculated 'spin-only' magnetic moment of Ti^ 2+ \ (3d^2) is :

Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic Role) A. V_2O_5 I. Preparation of ammonia from N_2/H_2 mixture B. Fe II. Polymerisation

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Generally, 3d transition metals have high melting points.

Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr^ 2+ ion

Which of the following set of ions act as oxidising agents?

The UV-visible absorption bands in the spectra of lanthanoid ions are ' X ', probably because of the excitation of electrons involving ' Y '. The ' X ' and ' Y ', respectively

The oxidation states not shown by Mn in given reaction is : 3 MnO_4^ 2- +4 H^ + 2 MnO_4^ - +MnO_2+2 H_2 O A. +6 B. +2 C. +4 D. +7 E. +3 Choose the most appropriate answer from the

The pair of lanthanoid ions which are diamagnetic is

The E^ ∘ value for the Mn^ 3+ / Mn^ 2+ couple is more positive than that of Cr^ 3+ / Cr^ 2+ or Fe^ 3+ / Fe^ 2+ due to change of

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe^ 2+ ion?

Baeyer's reagent is :

'Spin only' magnetic moment is same for which of the following ions? A. Ti^ 3+ B. Cr^ 2+ C. Mn^ 2+ D. Fe^ 2+ E. Sc^ 3+ Choose the most appropriate answer from the options given

Which of the following is correctly matched?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Ionisation enthalpies of early actinoids are lower than

The stability of Cu ^ 2 + is more than Cu ^ + salts in aqueous solution due to -

Which of the following statements are INCORRECT? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the

Decrease in size from left to right in actinoid series is greater and gradual than that in lanthanoid series due to:

Gadolinium has a low value of third ionisation enthalpy because of

In the neutral or faintly alkaline medium, KMnO _ 4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from

Zr ( Z = 40 ) and Hf ( Z = 72 ) have similar atomic and ionic radii because of:

The incorrect statement among the following is:

Identify the incorrect statement from the following:

Match the following aspects with the respective metal. Aspects Metal (a) The metal which reveals a maximum number of oxidation states (p) Scandium (b) The metal although placed in

Which of the following oxide is amphoteric in nature?

Identify the incorrect statement.

Which of the following transition elements have melting point below 500^ ∘ C ?

The basic character of the transition metal monoxide follows the order

Which of the following can react with K_2 Cr_2 O_7 ?

Assertion : Yb^ 2+ is more stable as compare to Gd^ 2+ . Reason : The electronic configuration of Gd is [ Xe] 4 f^7 5 d^2 6 s^2 .

Match the catalyst with the process Which of the following is the correct option?

When neutral or faintly alkaline KMnO_4 is treated with potassium iodide, iodide ion is converted into ' X '. ' X ' is

Least number of oxidation states is shown by

KMnO_4 on reaction with KOH does not give

In acidic medium, which of the following becomes colourless?

In which of the following elements number of d -electrons is zero in 6 d -orbital?

Which of the following exhibits minimum number of oxidation states?

Which is least stable in aqueous medium?

Among the following species, the one which become paramagnetic on heating at 850 K is

If M is element of actinoids series, the degree of complex formation decreases in the order

Match the metal ions given in Column &#39;I&#39; with the spin magnetic moments of the ions given in Column &#39;II&#39;. Column I Column II a. Co ^ 3 + i. 8 B . M . b. Cr ^ 3 +

The colourless species is

The correct increasing order of ionic radii of the following Ce^ 3+ , La^ 3+ , Pm^ 3+ and Yb^ 3+ is

Which of the following compound is not coloured?

When I^ - is oxidised by MnO_4^ - in alkaline medium, I^ - converts into

HgC l _ 2 and I _ 2 both when dissolved in water containing I ^ - ions the pair of species formed is:

It is because of the inability of ns ^ 2 electrons of the valence shell to participate in bonding that

The reason for greater range of oxidation states in actinoids is attributed to

Name the gas that can readily decolourise acidified KMnO _ 4 solution.

Best reagent for the conversion of AgNO_3 to Ag is

The value of n in MnO_4^ - +8 H^ + +n e^ - Mn^ 2+ +4 H_2 O is

Actinides exhibit larger number of oxidation state than that of corresponding lanthanides. The reason behind this aspect is

The E^ ∘ values for Mn and Zn are more negative than expected because

Which one of the following statements related to lanthanons is incorrect?

Which one of the following statements is correct when S O _ 2 is passed through acidified K _ 2 C r _ 2 O _ 7 solution?

The electronic configurations of Eu (Atomic no. 63 ), Gd (Atomic no. 64 ) and Tb (Atomic no. 65 ) are:

Copper sulphate is dissolved in water containing for making Bordeaux mixture.

Assertion: Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers. Reason : Change in colour is due to complexation of alcohol with

Assertion: K_2 Cr_2 O_7 is used as primary standard in volumetric analysis. Reason : It has a good solubility in water.

Gadolinium belongs of 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Number in the parenthesis are atomic numbers).

Spin only magnetic moment 2 .84 BM is given by: (Atomic Number of Ni =28, Ti =22, Cr =24, Co =27 )

In presence of acidic medium, KMnO_4 converts H_2 ~S into

KMnO_4 in alkaline medium changes to

Assertion: Chemistry of actinoids is more complicated than lanthanoids. Reason: Actinoid elements are radioactive.

Which one of the following is ' d ' -block element?

Name the type of the structure of silicate in which one oxygen atom of [SiO_4]^ 4- is shared?

In acidic medium, H _ 2 O _ 2 changes C r _ 2 O _ 7 ^ - 2 to Cr O _ 5 which has two (- O - O -) bonds Oxidation state of Cr in Cr O _ 5 is:

The reaction of aqueous KMn O _ 4 with H _ 2 O _ 2 in acidic conditions gives:

Reason of lanthanoid contraction is:

Which of the following element has lowest melting point?

Maximum number of unpaired electrons are present in

When calomel is treated with ammonium hydroxide, a black substance is formed. The black substance is

Which of the following is most basic?

Match the metal ions given in Column 'I' with the spin magnetic moments of the ions given in Column 'II'. Column I Column II a. Co ^ 3 + i. 8 B . M . b. Cr ^ 3 +