JEE Main PYQs — d & f-Block Elements

When MnO2 and H2SO4 is added to a salt (A), the greenish yellow gas liberated as salt (A) is :

While preparing crystals of Mohr's salt, dil H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2SO4 is added here to :

NaCl reacts with conc. H2SO4 and K2Cr2O7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are :

In chromyl chloride test for confirmation of Cl- ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% H2O2 turns organic layer blue indicating…

In alkaline medium, MnO4- oxidises I- to

A and B formed in the following reactions are: CrO2Cl2 + 4NaOH A + 2NaCl + 2H2O A + 2HCl + 2H2O2 B + 3H2O

Alkaline oxidative fusion of MnO2 gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are:

Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured…

Choose the correct statements from the following A. Mn2 O7 is an oil at room temperature B. V2O4 reacts with acid to give VO22+ C. CrO is a basic oxide D. V2O5 does not react with acid Choose the…

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

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

The transition metal having highest 3rd ionisation enthalpy is:

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 from the options given below:

Electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct?

Choose the correct option having all the elements with d10 electronic configuration from the following:

The number of elements from the following that do not belong to lanthanoids is: Eu, Cm, Er, Tb, Yb and Lu

Which of the following acts as a strong reducing agent? (Atomic number: Ce = 58, Eu = 63, Gd = 64, Lu = 71)

Diamagnetic Lanthanoid ions are:

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____. Ti2+,\, Cr2+ and V2+

Iron(III) catalyses the reaction between iodide and persulphate ions, in which: A. Fe3+ oxidises the iodide ion B. Fe3+ oxidises the persulphate ion C. Fe2+ reduces the iodide ion D. Fe2+ reduces the…

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 can not liberate…

The orange colour of K2Cr2O7 and purple colour of KMnO4 is due to:

Which of the following statements are correct about Zn, Cd and Hg? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. Zn and Cd do not show variable oxidation state while Hg…

Which of the following compounds show colour due to d–d transition?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In aqueous solutions Cr2+ is reducing while Mn3+ is oxidising in nature.…

Element not present in Nessler's reagent is

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to

A solution of CrO5 in amyl alcohol has a....colour

During the qualitative analysis of SO32- using dilute H2SO4, SO2 gas is evolved which turns K2Cr2O7 solution (acidified with dilute H2SO4):

KMnO4 oxidises I- in acidic and neutral/faintly alkaline solution, respectively to

A solution of FeCl3 when treated with K4[Fe(CN)6] gives a prussian blue precipitate due to the formation of

The pair of lanthanides in which both elements have high third-ionization energy is: (1) Dy, Gd (2) Lu, Yb (3) Eu, Yb (4) Eu, Gd

Which one amongst the following are good oxidising agents? (a) Sm2+ (b) Ce2+ (c) Ce4+ (d) Tb4+ Choose the most appropriate answer from the options given below :

Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number Sm — 62; Eu = 63; Tb = 65; Gd = 64, Pm = 61) Choose the correct answer from the options…

The set of correct statements is: (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides. (iii) Sc shows +4 oxidation state which is…

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral FeCl3, it…

Highest oxidation state of Mn is exhibited in Mn2 O7. The correct statements about Mn2 O7 are (A) Mn is tetrahedrally surrounded by oxygen atoms (B) Mn is octahedrally surrounded by oxygen atoms (C)…

Which halogen is known to cause the reaction given below? 2{MnO}_4^- + 2{X}^- 2{MnO}_4^{2-} + {X}_2

The magnetic moment of a transition metal compound has been calculated to be 3.87 BM. The metal ion is:

K2Cr2O7 paper acidified with dilute H2SO4 turns green when exposed to:

Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from:

Formula for Nessler's reagent is:

Which element is not present in Nessler's reagent?

Nd2+ = ____

In chromyl chloride, the number of d-electrons present on chromium is same as in: (Given at. no. of Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26)

Which of the following statements are correct? (A) The M3+/M2+ reduction potential for iron is greater than manganese. (B) The higher oxidation states of first row d-block elements get stabilized by…

The correct order of basicity of oxides of vanadium is:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Cu2+ in water is more stable than Cu+. Reason (R): Enthalpy of hydration for…

The dark purple colour of KMnO4 disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

The total number of Mn=O bonds in Mn2O7 is (1) 4 (2) 5 (3) 6 (4) 3

In neutral or alkaline solution, MnO4- oxidises thiosulphate to (1) S2O72- (2) S2O82- (3) SO32- (4) SO42-

In neutral or faintly alkaline medium, KMnO4 being a powerful oxidant can oxidise, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese…

Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it? (1) It will prefer to gain electron and act as an oxidizing agent (2) It will prefer to give away an…

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state? (1) Ce(At. No, 58) (2) La(At. No, 57) (3) Lu(At. No, 71) (4)…

Which one of the lanthanoids given below is the most stable in divalent form? (1) Yb (Atomic Number 70) (2) Sm (Atomic Number 62) (3) Eu (Atomic Number 63) (4) Ce (Atomic Number 58)

Which of the following has least tendency to liberate H2 from mineral acids?

In following pairs, the one in which both transition metal ions are colourless is:

Among the following, which is the strongest oxidizing agent?

The metal ion (in gaseous state) with lowest spin-only magnetic moment value is:

The 'f' orbitals are half and completely filled, respectively in lanthanide ions. [Given: Atomic No. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

Which of the following 3d-metal ion will give the lowest enthalpy of hydration (hydH) when dissolved in water?

Dihydrogen reacts with CuO to give:

The incorrect statement among the following is:

The major components of German Silver are :

Potassium permanganate on heating at 513 K gives a product which is : (1) paramagnetic and colourless (2) diamagnetic and colourless (3) diamagnetic and green (4) paramagnetic and green

In the structure of the dichromate ion, there is a : (1) linear symmetrical Cr — O — Cr bond. (2) non-linear unsymmetrical Cr — O — Cr bond. (3) non-linear symmetrical Cr — O — Cr bond. (4) linear…

In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively : 5 Fe2+ + MnO4- + 8H+ Mn2+ + 4H2O + 5 Fe3+ (1) Yellow, Green (2) Yellow, Orange (3) Green, Orange (4) Green, Yellow

Which one of the following is used to remove most of plutonium from spent nuclear fuel? (1) BrO3 (2) I2O5 (3) ClF3 (4) O2F2

Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58) (1) Nd (2) Yb (3) Ce (4) La

The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63 ] (1) 4f6 6s2 (2) 4f7 (3) 4f7 6s2 (4) 4f6

Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal] (1) Yb (2) Dy (3) Nd (4) Pr

The nature of oxides V2O3 and CrO is indexed as /X/ and /Y/ type respectively. The correct set of X and Y is:

The correct order of following 3d metal oxides, according to their oxidation numbers is: (a) CrO3 (b) Fe2O3 (c) MnO2 (d) V2O5 (e) Cu2O

The common positive oxidation states for an element with atomic number 24 are:

Identify the element for which electronic configuration in +3 oxidation state is [Ar]\, 3d5:

The set having ions which are coloured and paramagnetic both is:

Match List-I with List-II | List-I (Process) | List-II (Catalyst) | |------------------|--------------------| | (a) Deacon's process | (ii) CuCl2 | | (b) Contact process | (iv) V2O5 | | (c) Cracking…

What is the correct order of the following elements with respect to their density?

In which of the following pairs, the outermost electronic configuration will be the same?

Which of the following is Lindlar catalyst?

The major components in "Gun Metal" are:

Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

The electrode potential of M2+/M of 3d-series elements shows positive value for:

The incorrect statement is: (1) Manganate and permanganate ions are tetrahedral (2) In manganate and permanganate ions, the -bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of…

The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z = 64), respectively, are : (1) [Xe] 4f7 and 8.9 (2) [Xe] 4f7 and 7.9 (3) [Xe] 5f7 and 8.9 (4) [Xe] 5f7 and 7.9

The lanthanoid that does NOT show + 4 oxidation state is: (1) Dy (2) Ce (3) Eu (4) Tb

Mischmetal is an alloy consisting mainly of : (1) Lanthanoid metals (2) actinoid and transition metals (3) lanthanoid and actinoid metals (4) actinoid metals

The atomic radius of Ag is closest to (1) Au (2) Ni (3) Cu (4) Hg

The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: Xe = 54 , Ce = 58 , Eu = 63) (1) [Xe]4f2 and [Xe]4f7 (2) [Xe]4f7 and [Xe]4f1 (3) [Xe]4f76s2 and [Xe]4f26s2…

The incorrect statement(s) among (a) - (c) is (are) : (a) W(VI) is more stable than Cr(VI). (b) in the presence of HCl, permanganate titrations provide satisfactory results. (c) some lanthanoid…

The set that contains atomic numbers of only transition elements, is:

For the following Assertion and Reason, the correct option is: Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by…

The statement that is INCORRECT about the interstitial compounds is:

Consider the hydrated ions of Ti2+, V2+, Ti3+ and Sc3+. The correct order of their spin-only magnetic moments is:

The correct order of the first ionization enthalpies is:

The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is

The transition elements that has the lowest enthalpy of atomisation is:

The number of water molecules not coordinated to copper ion directly in CuSO4 . 5H2O, is (1) 4 (2) 2 (3) 1 (4) 3

Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO2 and a gaseous product. MnO2 reacts with NaCl and concentrated H2SO4 to give a pungent gas Z. X, Y and Z, respectively,…

The lanthanide ion that would show colour is: (1) Lu3+ (2) La3+ (3) Gd3+ (4) Sm3+

The highest possible oxidation states of uranium and plutonium, respectively, are (1) 4 and 6 (2) 7 and 6 (3) 6 and 4 (4) 6 and 7

The pair that has similar atomic radii is: (1) Mo and W (2) Sc and Ni (3) Mn and Re (4) Ti and Hf

A 4KOH, O2 2 B (Green) + 2H2O B 4HCl 2C (Purple) + MnO2 + 2H2O 2C H2O, KI 2 A + KOH + D In the above sequence of reactions, A and D, respectively, are: (1) KI and KMnO4 (2) MnO2 and KIO3 (3) KIO3 and…

The maximum number of possible oxidation states of actinoids are shown by: (1) nobelium (No) and lawrencium (Lr) (2) berkelium (Bk) and californium (Cf) (3) actinium (Ac) and thorium (Th) (4)…

The correct order of atomic radii is:

The metal that gives hydrogen gas upon treatment with both the acid as well as the base is:

The element that usually does NOT show variable oxidation states is:

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means:

The INCORRECT statement is: