JEE PYQ d and f Block Elements - Chapter-wise Questions with Solutions

About d and f Block Elements PYQs

d and f Block Elements has 517 previous year questions in the Quantrex Academy JEE Main & Advanced Chemistry bank. The 220 questions in this list come from JEE Main (201) and JEE Advanced (19), spanning 2006 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

JEE 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

Given below are two statements: Statement I: The number of pairs among [Ti^ 4+ , V^ 2+ ] , [V^ 2+ , Mn^ 2+ ] , [Mn^ 2+ , Fe^ 3+ ] and [V^ 2+ , Cr^ 2+ ] in which both ions are

Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for

The correct order of first (Δ_i H_1) and second (Δ_i H_2) ionisation enthalpy values of Cr and Mn are : A. Δ_i H_1 : Cr > Mn B. Δ_i H_2 : Cr > Mn C. Δ_i H_1 : Mn > Cr D. Δ_i H_2

The correct statements among the following are. A. Basic vanadium oxide is used in the manufacture of H_2SO_4 . B. The spin-only magnetic moment value of the transition metal

Given below are two statements : Statement I: Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement

A paper dipped in a dil. H_2SO_4 solution of ' X ' upon treatment with SO_2 gas turns into green. The compound ' X ' is :

Which of the following is NOT a physical or chemical characteristics of interstitial compounds?

Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B.

Consider |x| is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with |x| number of unpaired electrons from the

The correct statements among the following are, A. Mo(VI) and W(VI) are less stable than Cr(VI) . B. Ce^ 4+ and Tb^ 4+ are oxidant while Eu^ 2+ and Yb^ 2+ are reductant. C. Cm and

Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises FeSO_4 to Fe_2(SO_4)_3 in acidic medium. B. Sodium dichromate can be used

Number of paramagnetic ions among the following d- and f-block metal ions is _______. Mn^ 2+ , Cu^ 2+ , Zn^ 2+ , Yb^ 2+ , Sc^ 3+ , La^ 3+ , Gd^ 3+ , Lu^ 3+ , Ti^ 4+ , Ce^ 4+

Which of the following sets includes all the species that will change the orange colour of K_2Cr_2O_7 in acidic medium?

Consider the following statements about manganate and permanganate ions. Identify the correct statements. A. The geometry of both manganate and permanganate ions is tetrahedral.

Given below are two statements: Statement I : The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3. [Sc^ 3+ , Ti^ 3+ ],[Mn^ 2+

" X " is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in " X ". The color of the potassium salt of X is

The oxidation state of chromium in the final product formed in the reaction between KI and acidified K_ 2 Cr_ 2 O_ 7 solution is:

Given below are two statements : Statement I : The first ionization enthalpy of Cr is lower than that of Mn . Statement II : The second and third ionization enthalpies of Cr are

Among the following oxides of 3 d elements, the number of mixed oxides are \_\_\_\_ 。 Ti_ 2 O_ 3 , ~V_ 2 O_ 4 , Cr_ 2 O_ 3 , Mn_ 3 O_ 4 , Fe_ 3 O_ 4 , Fe_ 2 O_ 3 , Co_ 3 O_ 4

A first row transition metal (M) does not liberate H_ 2 gas from dilute HCl.1 mol of aqueous solution of MSO_ 4 is treated with excess of aqueous KCN and then H_ 2 ~S(~g) is

Given below are some of the statements about Mn and Mn_ 2 O_ 7 . Identify the correct statements. A. Mn forms the oxide Mn_ 2 O_ 7 , in which Mn is in its highest oxidation state.

On heating a mixture of common salt and K_ 2 Cr_ 2 O_ 7 in equal amount along with concentrated H_ 2 SO_ 4 in a test tube, a gas is evolved. Formula of the gas evolved and

MnO_ 4 ^ 2- , in acidic medium, disproportionates to :

Consider the following reactions: NaCl+K_ 2 Cr_ 2 O_ 7 +H_ 2 SO_ 4 arrow ~A+KHSO_ 4 +NaHSO_ 4 +H_ 2 O A+NaOH arrow B+NaCl+H_ 2 O B+H_ 2 SO_ 4 +H_ 2 O_ 2 arrow C+Na_ 2 SO_ 4 +H_ 2

The pair(s) of diamagnetic ions is(are)

The correct decreasing order of spin only magnetic moment values (BM) of Cu^ + , Cu^ 2+ , Cr^ 2+ and Cr^ 3+ ions is :

' X ' is the number of acidic oxides among VO_2 , V_2 O_3, CrO_3, ~V_2 O_5 and Mn_2 O_7 . The primary valency of cobalt in [Co(H_2 NCH_2 CH_2 NH_2)_3]_2(SO_4)_3 is Y. The value of

The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is

The first transition series metal ' M ' has the highest enthalpy of atomisation in its series. One of its aquated ion (M^ n ) exists in green colour. The nature of the oxide

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

Pair of transition metal ions having the same number of unpaired electrons is :

KMnO_4 acts as an oxidising agent in acidic medium. ' X ' is the difference between the oxidation states of Mn in reactant and product. ' Y ' is the number of ' d ' electrons

Given below are two statements : Statement I : CrO_3 is a stronger oxidizing agent than MoO_3 Statement II : Cr(VI) is more stable than Mo(VI) In the light of the above

Among, Sc, Mn, Co and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____ BM (in

The metal ions that have the calculated spin only magnetic moment value of 4.9 B.M. are A. Cr^ 2+ B. Fe^ 2+ C. Fe^ 3+ D. Co^ 2+ E. Mn^ 3+ Choose the correct answer from the

Consider the following reactions aligned & CrO_2 Cl_ 2( Vapour ) +NaOH arrow B+NaCl+H_2 O & B+H^ + arrow C+H_2 O aligned The number of terminal ' O ' present in the compound ' C '

The molar mass of the water insoluble product formed from the fusion of chromite ore \((FeCr_2 O_4)\) with \(Na_2 CO_3\) in presence of \(O_2\) is _______ \(g mol^ -1 \).

The amphoteric oxide among V_2 O_3, ~V_2 O_4 and V_2 O_5 , upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :

Identify the inorganic sulphides that are yellow in colour : (A) (NH_4)_2 ~S (B) Pbs (C) Cus (D) As_2 ~S_3 (E) As_2 ~S_5 Choose the correct answer from the options given below :

The spin only magnetic moment ( μ ) value (B.M.) of the compound with strongest oxidising power among Mn_2 O_3, TiO and VO is ____ B.M. (Nearest integer).

Which of the following oxidation reactions are carried out by both K_2 Cr_2 O_7 and KMnO_4 in acidic medium? A. Γ^ - arrow I_2 B. S^ 2- arrow S C. Fe^ 2+ arrow Fe^ 3+ D. Γ^

Consider ' n ' is the number of lone pair of electrons present in the equatorial position of the most stable structure of ClF_3 . The ions from the following with ' n ' number of

Find the compound ' A ' from the following reaction sequences. A aqua-regia B [ (2) AcOH] (1) KNO_2 NH_4 OH yellow ppt

Preparation of potassium permanganate from MnO_2 involves two step process in which the 1st step is a reaction with KOH and KNO_3 to produce

Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce=58, Eu=63, ~Tb=65, Lu=71 )

Consider the following reactions K_2 Cr_2 O_7 [-H_2 O] KOH [A] [-H_2 O] H_2 SO_4 [~B]+K_2 SO_4 The products [A] and [B] , respectively are :

Match List - I with List - II. List - I List - II (A) Bronze (I) Cu, Ni (B) Brass (II) Fe, Cr, Ni, C (C) UK silver coin (III) Cu, Zn (D) Stainless steel (IV) Cu, Sn Choose the

The correct set of ions (aqueous solution) with same colour from the following is:

Niobium ( Nb ) and ruthenium (Ru) have " x " and " y " number of electrons in their respective 4 d orbitals. The value of x+y is ______ -.

Lanthanoid ions with 4 f^7 configuration are : (A) Eu^ 2+ (B) Gd^ 3+ (C) Eu^ 3+ (D) Tb^ 3+ (E) Sm^ 2+ Choose the correct answer from the options given below :

Paragraph: When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reaction is observed in which a complex \(P\) is formed. In a strong

Paragraph: When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reaction is observed in which a complex \(P\) is formed. In a strong

Give below are two statements: Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements. Statement II : Copper

A transition metal ' \( M \) ' among \( Sc, Ti, V, Cr, Mn \) and \( Fe \) has the highest second ionisation enthalpy. The spin-only magnetic moment value of \(M^ + \)ion is

\(0.05 M CuSO_4\) when treated with \(0.01 M K_2 Cr_2 O_7\) gives green colour solution of \(Cu_2 Cr_2 O_7\). The two solutions are separated as shown below : [SPM : Semi

lectronic configuration of \( Cu(II) \) is \(3 ~d^ 9\) whereas that of \( Cu(I) \) is \(3 ~d^ 10 \). Which of the following is correct?

Number of colourless lanthanoid ions among the following is ________ \(Eu^ 3+ , Lu^ 3+ , Nd^ 3+ , La^ 3+ , Sm^ 3+ \)

Given below are two statements : Statement (I) : Fusion of \(MnO_2\) with \(KOH\) and an oxidising agent gives dark green \(K_2 MnO_4\). Statement (II) : Manganate ion on

Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. \( Fe^ 3+ \) oxidises the iodide ion B. \( Fe^ 3+ \) oxidises the persulphate ion C. \( Fe^ 2+

The 'spin only' magnetic moment value of \(MO_4 ^ 2- \) is _______ BM. (Where M is a metal having least metallic radii. among \(Sc, Ti, V, Cr, Mn\) and \(Zn\) ). (Given atomic

Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) \( Sc \) (B) \( Cr \) (C) \( V \) (D) \( Ti \) (E) Mn Choose the correct answer

Total number of species from the following with central atom utilising \(sp^2\) hybrid orbitals for bonding is _____. \(NH_3, SO_2, SiO_2, BeCl_2, C_2 H_2, C_2 H_4, BCl_3, HCHO

The number of element from the following that do not belong to lanthanoids is \(Eu, Cm, Er, Tb, Yb\) and \(Lu\)

Among \(CrO, Cr_2 O_3\) and \(CrO_3\), the sum of spin-only magnetic moment values of basic and amphoteric oxides is _______ \(10^ -2 BM\) (nearest integer). (Given atomic number

The difference in the 'spin-only' magnetic moment values of \(KMnO_4\) and the manganese product formed during titration of \(KMnO_4\) against oxalic acid in acidic medium is

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _____. \(Ti^ 2+ , Cr^ 2+ \) and \(V^ 2+ \)

While preparing crystals of Mohr's salt, dil \(H_2 SO_4\) is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil \(H_2

The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products \(A \) and \(B\) along with the evolution of \(CO _ 2 \). The sum of

The metal that shows highest and maximum number of oxidation state is :

The spin-only magnetic moment value of the ion among \( Ti^ 2+ , V^ 2+ , Co^ 3+ \) and \( Cr^ 2+ \), that acts as strong oxidising agent in aqueous solution is _______ BM (Near

When \(MnO_2\) and \(H_2 SO_4\) is added to a salt (A), the greenish yellow gas liberated as salt (A) is :

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of \(3.86 BM\). The atomic number of the metal is

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula \(M _ 2 O_ n \) (where \( n=3,4\), 5). The

What will be the decreasing order of basic strength of the following conjugate bases? \( ^ - OH, R O , CH_3 CO O , C I \)

The element which shows only one oxidation state other than its elemental form is :

Consider the following reaction \(MnO _ 2 + KOH+O _ 2 arrow A+H _ 2 O \). Product ' \(A \) ' in neutral or acidic medium disproportionate to give products ' \(B \) ' and ' \(C \)

Which element is not present in Nessler’s reagent?