Quantrex Academy Quantrex AcademyPYQs with solutions · JEE · NEET · NDA

Home · NEET UG · Chemistry · d and f Block Elements

d and f Block Elements — NEET UG Chemistry PYQs

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

869 questionsChemistrySolutions on every page
1

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

NEET 2026 Solution View → 2

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

NEET 2026 Solution View → 3

The green paramagnetic species formed by heating KMn O₄ at 513 K is

NEET 2026 Solution View → 4

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

NEET 2026 Solution View → 5

Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic Role) A. V ₂ O ₅ I. Preparation of ammonia from N ₂/ H ₂ mixture B. Fe II. Polymerisation

NEET 2026 Solution View → 6

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. Reas

NEET 2026 Solution View → 7

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 ( Z

NEET 2025 Solution View → 8

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

NEET 2024 Solution View → 9

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, are

NEET 2024 Solution View → 10

The oxidation states not shown by Mn in given reaction is : 3 MnO ₄²⁻+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 option

NEET 2024 Solution View → 11

The pair of lanthanoid ions which are diamagnetic is

NEET 2024 Solution View → 12

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

NEET 2024 Solution View → 13

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?

NEET 2024 Solution View → 14

Baeyer's reagent is :

NEET 2024 Solution View → 15

'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 below.

NEET 2024 Solution View → 16

Which of the following is correctly matched?

NEET 2023 Solution View → 17

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 f

NEET 2023 Solution View → 18

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

NEET 2023 Solution View → 19

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 g

NEET 2023 Solution View → 20

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

NEET 2022 Solution View → 21

Gadolinium has a low value of third ionisation enthalpy because of

NEET 2022 Solution View → 22

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

NEET 2022 Solution View → 23

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

NEET 2021 Solution View → 24

The incorrect statement among the following is:

NEET 2021 Solution View → 25

Identify the incorrect statement from the following:

NEET 2020 Solution View → 26

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

NEET 2020 Solution View → 27

Which of the following oxide is amphoteric in nature?

NEET 2020 Solution View → 28

Identify the incorrect statement.

NEET 2020 Solution View → 29

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

AIIMS 2019 Solution View → 30

The basic character of the transition metal monoxide follows the order

AIIMS 2019 Solution View → 31

Which of the following can react with K ₂ Cr ₂ O ₇ ?

AIIMS 2019 Solution View → 32

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 .

AIIMS 2019 Solution View → 33

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

NEET 2019 Solution View → 34

When neutral or faintly alkaline KMnO ₄ is treated with potassium iodide, iodide ion is converted into ' X '. ' X ' is

NEET 2019 Solution View → 35

Least number of oxidation states is shown by

AIIMS 2018 Solution View → 36

KMnO ₄ on reaction with KOH does not give

AIIMS 2018 Solution View → 37

In acidic medium, which of the following becomes colourless?

AIIMS 2018 Solution View → 38

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

AIIMS 2018 Solution View → 39

Which of the following exhibits minimum number of oxidation states?

AIIMS 2018 Solution View → 40

Which is least stable in aqueous medium?

AIIMS 2018 Solution View → 41

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

JIPMER 2018 Solution View → 42

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

JIPMER 2018 Solution View → 43

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.

NEET 2018 Solution View → 44

The colourless species is

AIIMS 2017 Solution View → 45

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

JIPMER 2017 Solution View → 46

Which of the following compound is not coloured?

JIPMER 2017 Solution View → 47

When I ⁻ is oxidised by MnO ₄⁻ in alkaline medium, I ⁻ converts into

JIPMER 2017 Solution View → 48

H g C l 2 and I 2 both when dissolved in water containing I - ions the pair of species formed is:

NEET 2017 Solution View → 49

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

NEET 2017 Solution View → 50

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

NEET 2017 Solution View → 51

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

NEET 2017 Solution View → 52

Best reagent for the conversion of AgNO ₃ to Ag is

AIIMS 2016 Solution View → 53

The value of n in MnO ₄⁻+8 H ⁺+n e⁻ Mn ²⁺+4 H ₂ O is

JIPMER 2016 Solution View → 54

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

JIPMER 2016 Solution View → 55

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

JIPMER 2016 Solution View → 56

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

NEET 2016 Solution View → 57

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

NEET 2016 Solution View → 58

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

NEET 2016 Solution View → 59

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

AIIMS 2015 Solution View → 60

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 p

AIIMS 2015 Solution View → 61

Assertion: K ₂ Cr ₂ O ₇ is used as primary standard in volumetric analysis. Reason : It has a good solubility in water.

AIIMS 2015 Solution View → 62

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

NEET 2015 Solution View → 63

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

NEET 2015 Solution View → 64

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

NEET 2015 Solution View → 65

In presence of acidic medium, KMnO ₄ converts H ₂ ~S into

AIIMS 2014 Solution View → 66

KMnO ₄ in alkaline medium changes to

AIIMS 2014 Solution View → 67

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

AIIMS 2014 Solution View → 68

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

JIPMER 2014 Solution View → 69

Name the type of the structure of silicate in which one oxygen atom of [ SiO ₄ ]⁴⁻ is shared?

JIPMER 2014 Solution View → 70

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

NEET 2014 Solution View → 71

The reaction of aqueous K M n O 4 with H 2 O 2 in acidic conditions gives:

NEET 2014 Solution View → 72

Reason of lanthanoid contraction is:

NEET 2014 Solution View → 73

Which of the following element has lowest melting point?

AIIMS 2013 Solution View → 74

Maximum number of unpaired electrons are present in

AIIMS 2013 Solution View → 75

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

AIIMS 2013 Solution View → 76

Which of the following is most basic?

AIIMS 2013 Solution View → 77

Assertion : Cu is stronger reducing agent than H ₂ . Reason : E^ of Cu ²⁺ / Cu is negative.

AIIMS 2013 Solution View → 78

Which of the following metal ion forms unstable complex with CN ⁻ ?

AIIMS 2013 Solution View → 79

Oxidation state of iron in haemoglobin is

AIIMS 2013 Solution View → 80

K ₂ Cr ₂ O ₇ in acidic medium converts into

AIIMS 2013 Solution View → 81

On addition of small amount of KMnO ₄ to conc. H ₂ SO ₄ , a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.

JIPMER 2013 Solution View → 82

The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magmetic moment.

JIPMER 2013 Solution View → 83

Sc ( Z =21) is transition element but Zn (Z=30) is not because:

NEET 2013 Solution View → 84

Which of the following lanthanoid ions is diamagnetic? (At. nos. Ce =58, Sm =62, Eu =63 , Yb =70 )

NEET 2013 Solution View → 85

KMnO ₄ can be prepared from K ₂ MnO ₄ as per reaction (3 MnO ₂²⁻+2 H ₂ O 2 MnO ₄⁻+ MnO ₂+4 OH ⁻ ). The reaction can go to completion by removing OH ⁻ ions by adding

NEET 2013 Solution View → 86

Which of the following statements about the interstitial compounds is incorrect?

NEET 2013 Solution View → 87

The outer electronic configuration of Gd (At. No. 64) is:

NEET 2013 Solution View → 88

MnO ₃ in an acidic medium dissociates into

AIIMS 2012 Solution View → 89

Magnetic moment of Cr ²⁺ is nearest to

AIIMS 2012 Solution View → 90

Assertion : Ce ⁴⁺ is used as an oxidising agent in volumetric analysis. Reason : Ce ⁴⁺ has the tendency of attaining +3 oxidation state.

AIIMS 2012 Solution View → 91

Identify the alloy containing a non-metal as a constituent in it.

NEET 2012 Solution View → 92

Which of the statements is not true?

NEET 2012 Solution View → 93

The catalytic activity of transition metals and their compounds is ascribed mainly to

NEET 2012 Solution View → 94

Which one of the following does not correctly represent the correct order of the property indicated against it?

NEET 2012 Solution View → 95

Which of the following exhibits only +3 oxidation state?

NEET 2012 Solution View → 96

Which material is used as a neutron moderator?

AIIMS 2011 Solution View → 97

Assertion : Reduction potential of Mn (+3 to +2 ) is more positive than Fe (+3 to +2 ) . Reason : Ionisation potential of Mnis more than that of Fe .

AIIMS 2011 Solution View → 98

Which of the following has the maximum number of unpaired electrons?

JIPMER 2011 Solution View → 99

The maximum oxidation state exhibited by actinide ions is

JIPMER 2011 Solution View → 100

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (At. no. Cr =24, Mn =25, Fe =26,

NEET 2011 Solution View → 101

If n=6 , the correct sequence for filling of electrons will be

NEET 2011 Solution View → 102

Acidified K ₂ Cr ₂ O ₇ solution turms green when Na ₂ SO ₃ is added to it. This is due to the formation of

NEET 2011 Solution View → 103

What are constituents of 'Mischmetal'?

AIIMS 2010 Solution View → 104

Assertion : Zinc displaces copper from copper sulphate solution. Reason : The E^ of zinc is -0.76 ~V and that of copper is +0.34 ~V .

AIIMS 2010 Solution View → 105

In the ground state of Cu ⁺ , the number of shells occupied, subshells occupied, filled orbitals and unpaired electrons respectively are

AIIMS 2010 Solution View → 106

Assertion : Transition metals are poor reducing agents . Reason : Transition metals form numerous alloys with other metals.

AIIMS 2010 Solution View → 107

Assertion : The degree of complex formation in actinides decreases in the order M⁴⁺> MO ₂ ²⁺>M³⁺> MO ₂ ⁺ . Reason : Actinides form complexes with p-bonding ligands such as alkyl ph

AIIMS 2010 Solution View → 108

Which of the following complex ions is not expected to absorb visible light?

NEET 2010 Solution View → 109

Which of the following ions will exhibit colour in aqueous solutions ?

NEET 2010 Solution View → 110

Which of the following oxidation states is the most common among the lanthanoids?

NEET 2010 Solution View → 111

Mercurous chloride exists in the form of

AIIMS 2009 Solution View → 112

Which of the following complex ions is expected to absorb visible light ? (At no. Zn =30, Sc =21, Ti =22, Cr =24 )

NEET 2009 Solution View → 113

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states ?

NEET 2009 Solution View → 114

Out of TiF ₆²⁻, CoF ₆³⁻, Cu ₂ Cl ₂ and NiCl ₄²⁻ ( Z of Ti =22, Co =27, Cu =29, Ni =28 ) the colourless species are

NEET 2009 Solution View → 115

( BaO ₂ ) and ozone reacts to produce

JIPMER 2008 Solution View → 116

Cyanogen gas is obtained in the reaction

AIIMS 2007 Solution View → 117

Assertion : Magnetic moment of Dy is the highest among the lanthanoids. Reason : Orbital motion contributes magnetic moment.

AIIMS 2007 Solution View → 118

The aqueous solution containing which one of the following ions will be colourless ? (Atomic no. Sc =21, Fe =26, Ti =22, Mn =25 )

JIPMER 2007 Solution View → 119

The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is

JIPMER 2007 Solution View → 120

Identify the incorrect statement among the following:

NEET 2007 Solution View →
Practice all d and f Block Elements questions in the app →