# Solved papers for NEET Chemistry NEET PYQ-The d-and f-Block Elements

### done NEET PYQ-The d-and f-Block Elements Total Questions - 52

• question_answer1) Which one of the following elements shows maximum number of different oxidation states in its compounds? [AIPMT 1998]

A)
Eu

B)
La

C)
Gd

D)
Am

• question_answer2) Which one of the following elements constitutes a major impurity in pig iron?        [AIPMT 1998]

A)
Silicon

B)
Oxygen

C)
Sulphur

D)
Graphite

• question_answer3) Which one of the following pairs of substances on reaction will not evolve ${{H}_{2}}$ gas?  [AIPMT 1998]

A)
Iron and ${{H}_{2}}S{{O}_{4}}$ (aqueous)

B)
Iron and steam

C)
Copper and $HCl$ (aqueous)

D)
Sodium and ethyl alcohol

• question_answer4) Which one of the following ionic species will impart colour to an aqueous solution? [AIPMT 1998]

A)
$T{{i}^{4+}}$

B)
$C{{u}^{+}}$

C)
$Z{{n}^{2+}}$

D)
$C{{r}^{3+}}$

• question_answer5)  Which one of the following forms a colourless solution in aqueous medium?     [AIPMT 2000] (Atomic number  :$Sc=21,\text{ }Ti=22,\text{ }V=23,\text{ }Cr=24$)

A)
${{V}^{3+}}$

B)
$C{{r}^{3+}}$

C)
$T{{i}^{3+}}$

D)
$S{{c}^{3+}}$

• question_answer6) Of the following transition metals, the maximum numbers of oxidation states are exhibited by: [AIPMT 2000]

A)
chromium $(Z=24)$

B)
manganese $(Z=25)$

C)
iron $(Z=26)$

D)
titanium $(Z=22)$

• question_answer7) Which of the following statements is net correct? [AIPMT 2001]

A)
$La{{(OH)}_{3}}$ is less basic than $Li{{(OH)}_{3}}$

B)
In lanthanide series ionic radius of $L{{n}^{3+}}$ ion decreases

C)
La is actually an element of transition series rather lanthanide

D)
Atomic radius of Zn and Hf are same because of lanthanide contraction

• question_answer8) Which of the following statement is true?    [AIPMT 2002]

A)
Silicon exhibits 4 coordination number in its compounds

B)
Bond energy of ${{F}_{2}}$ is less than $C{{l}_{2}}$

C)
Mn(III) oxidation state is more stable than Mn(Il) in aqueous state

D)
Elements of 15th group shows only + 3 and +5 oxidation states

• question_answer9) Which of the following shows maximum number of oxidation states?                        [AIPMT 2002]

A)
Cr

B)
Fe

C)
Mn

D)
V

• question_answer10) Zn gives ${{H}_{2}}$ gas with ${{H}_{2}}S{{O}_{4}}$ and $HCl$ but not with $HN{{O}_{3}}$                                          [AIPMT 2002]

A)
Zn act as oxidising agent when react with $HN{{O}_{3}}$

B)
$HN{{O}_{3}}$ is weaker acid then ${{H}_{2}}S{{O}_{4}}$ and $HCl$

C)
In electrochemical series Zn is above hydrogen

D)
$NO_{3}^{-}$ is reduced in preference to hydronium ion

• question_answer11) The basic character of the transition metal monoxides follows the order:         [AIPMT 2003]

A)
$TiO>FeO>VO>CrO$

B)
$TiO>VO>CrO>FeO$

C)
$VO>CrO>TiO>FeO$

D)
$CrO>VO>FeO>TiO$

• question_answer12) The correct order of ionic radii of ${{Y}^{3+}},\text{ }L{{a}^{3+}},\text{ }E{{u}^{3+}}$ and $L{{u}^{3+}}$ is:     [AIPMT 2003]

A)
$L{{u}^{3+}}<E{{u}^{3+}}<L{{a}^{3+}}<{{Y}^{3+}}$

B)
$L{{a}^{3+}}<E{{u}^{3+}}<L{{u}^{3+}}<{{Y}^{3+}}$

C)
${{Y}^{3+}}<L{{a}^{3+}}<E{{u}^{3+}}<L{{u}^{3+}}$

D)
${{Y}^{3+}}<L{{u}^{3+}}<E{{u}^{3+}}<L{{a}^{3+}}$

• question_answer13) Which one of the following characteristics of the transition metals is associated with their catalytic activity? [AIPMT 2003]

A)
Colour of hydrated ions

B)
Variable oxidation states

C)
High enthalpy of atomization

D)
Paramagnetic behavior

• question_answer14) Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is: [AIPMT (S) 2004]

A)
Fe

B)
Zn

C)
K

D)
Ca

• question_answer15) Among the following series of transition metal ions, the one in which all metal ions have $3{{d}^{2}}$electronic configuration is: (At. no. :$Ti=22;$$V=23;$$Cr=24;Mn=25$) [AIPMT (S) 2004]

A)
$T{{i}^{3+}},{{V}^{2+}},C{{r}^{3+}},\,\,M{{n}^{4+}}$

B)
$T{{i}^{+}},{{V}^{4+}},C{{r}^{6}},\,\,M{{n}^{7+}}$

C)
$T{{i}^{4+}},{{V}^{3+}},C{{r}^{2+}},\,\,M{{n}^{3+}}$

D)
$T{{i}^{2+}},{{V}^{3+}},C{{r}^{4+}},\,\,M{{n}^{5+}}$

• question_answer16) Lanthanides are:                 [AIPMT (S) 2004]

A)
14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sub-level

B)
14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sub-level

C)
14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sub-level

D)
14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sub-level

• question_answer17) The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is:       [AIPMT (S) 2005]

A)
one fifth

B)
five

C)
one

D)
two

• question_answer18)  The aqueous solution containing which one of the following ions will be colourless?  [AIPMT (S) 2005] (Atomic no. : Sc = 21, Fe = 26, Ti = 22, Mn = 25)

A)
$S{{c}^{3+}}$

B)
$F{{e}^{2+}}$

C)
$T{{i}^{3+}}$

D)
$M{{n}^{2+}}$

• question_answer19) Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?                                     [AIPMT (S) 2005]

A)

B)
Chromium (Z = 24)

C)
Iron (2 = 26)

D)
Manganese (Z = 25)

• question_answer20) The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is: [AIPMT (S) 2005]

A)
lesser energy difference between 5 f  and 6d orbitals than between 4f and 5d orbitals

B)
larger atomic size of actinides than the lanthanides

C)
more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

D)
greater reactive nature of the actinides than the lanthanides

• question_answer21) More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is:                          [AIPMT (S) 2006]

A)
more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

B)
lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

C)
greater metallic character of the lanthanoids than that of the corresponding actinoids

D)
more active nature of the actinoids

• question_answer22)  In which of the following pairs are both the ions coloured in aqueous solution? [AIPMT (S) 2006] (At. no.: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

A)
Ni2+, Ti3+

B)
Sc3+, Ti3+

C)
Sc3 , Co2+

D)
Ni2+, Cu+

• question_answer23) The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is:        [AIPMT (S) 2007]

A)
$\frac{3}{5}$

B)
$\frac{4}{5}$

C)
$\frac{2}{5}$

D)
1

• question_answer24) Identify the incorrect statement among the following:                            [AIPMT (S) 2007]

A)
There is a decrease in the radii of die atoms or ions as one proceeds from La to Lu.

B)
Lanthanoid contraction is the accumulation of successive shrinkages

C)
As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with die 5d series of elements

D)
Shielding power of 4f electrons is quite weak..

• question_answer25)  Which one of the following ions is the most stable in aqueous solution?              [AIPMT (S) 2007] (At. no. Ti = 22, V - 23, Cr = 24, Mn = 25)

A)
Cr3+

B)
V3+

C)
Ti3+

D)
Mn3+

• question_answer26) The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn(25) is [AIPMT (S) 2008]

A)
$Cr>Mn>V>Ti$

B)
$V>Mn>Cr>Ti$

C)
$Mn>Cr>Ti>V$

D)
$Ti>V>Cr>Mn$

• question_answer27) Number of moles of $MnO_{4}^{-}$ required to oxidize one mole of ferrous oxalate completely in acidic medium will be                       [AIPMT (S) 2008]

A)
0. 6 mole

B)
0.4 mole

C)
7.5 moles

D)
0.2 mole

• question_answer28) Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? [AIPMT (S) 2009]

A)
3d3, 4s2

B)
3d5, 4s1

C)
3d5, 4s2

D)
3d2, 4s2

• question_answer29) The ionisation constant of ammonium hydroxide is $4\times {{10}^{-8}}m.$ at 298 K. Hydrolysis constant of ammonium chloride is               [AIPMT (S) 2009]

A)
$V{{m}^{-1}}$

B)
$8\times {{10}^{7}}$

C)
$5\times {{10}^{-11}}$

D)
$8\times {{10}^{-11}}$

• question_answer30) Out of $TiF_{6}^{2-},\,CoF_{6}^{3-},\,CuC{{l}_{2}}$ and $NiCl_{4}^{2-}$ (Z of $=k[A]{{[B]}^{2}}$) the colourless species are             [AIPMT (S) 2009]

A)
$=k{{[A]}^{2}}{{[B]}^{2}}$and $=k[A][B]$

B)
$N_{2}^{-}<{{N}_{2}}<N_{2}^{2-}$ and $N_{2}^{2-}<N_{2}^{-}<{{N}_{2}}$

C)
${{N}_{2}}<N_{2}^{2-}<N_{2}^{-}$and$N_{2}^{-}<N_{2}^{2-}<{{N}_{2}}$

D)
${{C}_{2}},{{C}_{3}},{{C}_{5}}$ and ${{C}_{6}}$

• question_answer31) Which of the following ions will: exhibit colour in aqueous solutions?               [AIPMT (S) 2010]

A)
$L{{a}^{3+}}(Z=57)$

B)
$T{{i}^{3+}}(Z=22)$

C)
$L{{u}^{3+}}(Z=71)$

D)
$S{{c}^{3+}}(Z=21)$

• question_answer32) Which of the following oxidation states is the most common among the lanthanides? [AIPMT (M) 2010]

A)
4

B)
2

C)
5

D)
3

• question_answer33)  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? [AIPMT (S) 2011] (At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

A)
Fe > Mn > Co > Cr

B)
Co > Mn > Fe > Cr

C)
Cr > Mn > Co > Fe

D)
Mn > Fe > Cr > Co

• question_answer34) Acidified ${{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$ solution turns green when $\text{N}{{\text{a}}_{\text{2}}}\text{S}{{\text{O}}_{\text{3}}}$is added to it. This is due to the formation of [AIPMT (S) 2011]

A)
$\text{CrO}_{4}^{2-}$

B)
$\text{C}{{\text{r}}_{\text{2}}}{{\text{(S}{{\text{O}}_{\text{3}}}\text{)}}_{\text{3}}}$

C)
$\text{CrS}{{\text{O}}_{4}}$

D)
$\text{C}{{\text{r}}_{\text{2}}}{{\text{(S}{{\text{O}}_{4}})}_{3}}$

• question_answer35) In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with             [AIPMT (S) 2012]

A)
copper (I) sulphide ($\text{C}{{\text{u}}_{\text{2}}}\text{S}$)

B)
sulphur dioxide ($\text{C}{{\text{O}}_{\text{2}}}$)

C)
iron sulphide (FeS)

D)
carbon monoxide (CO)

• question_answer36) Which of the statements is not true?                                                 [AIPMT (S) 2012]

A)
On passing ${{\text{H}}_{\text{2}}}\text{S}$ through acidified ${{\text{k}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$ solution, a milky colour is observed

B)
$\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$is preferred over ${{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$ in volumetric analysis

C)
${{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$ solution in acidic medium is orange

D)
${{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}$ solution becomes yellow on increasing the pH beyond 7

• question_answer37) Which one of the following does not correctly represent the correct order of the property indicated against it?           [AIPMT (M) 2012]

A)
$Ti<V<Cr<Mn$: increasing number of oxidation states

B)
$T{{i}^{3+}}<{{V}^{3+}}<C{{r}^{3+}}<M{{n}^{3+}}$: increasing magnetic moment

C)
$Ti<V<Cr<Mn$: increasing melting points

D)
$Ti<V<Mn<Cr$: increasing second ionisation enthalpy

• question_answer38) Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential $({{E}^{o}}_{{{M}^{2+}}/M})$positive sign?                            [AIPMT (M) 2012]

A)
Co (Z = 27)

B)
Ni (Z = 28)

C)
Cu (Z = 29)

D)
Fe (Z = 26)

• question_answer39) The catalytic activity of transition metals and their compounds is ascribed mainly to [AIPMT (M) 2012]

A)
their magnetic behavior

B)
their unfilled d-orbitals

C)
their ability to adopt variable oxidation states

D)
their chemical reactivity

• question_answer40) Which of the following exhibits only +3 oxidation state?                                  [AIPMT (M) 2012]

A)
U

B)
Th

C)
Ac

D)
Pa

• question_answer41)  $\text{KMn}{{\text{O}}_{\text{4}}}$ can be prepared from ${{\text{K}}_{\text{2}}}\text{Mn}{{\text{O}}_{\text{4}}}$ as per reaction$\text{3MnO}_{4}^{2-}+2{{H}_{2}}O2MnO_{4}^{-}$$+Mn{{O}_{2}}+4O{{H}^{-}}$[NEET 2013] The reaction can go to completion by removing $\text{O}{{\text{H}}^{\text{-}}}$ ions by adding

A)
HCI

B)
KOH

C)
$C{{O}_{2}}$

D)
$S{{O}_{2}}$

• question_answer42) The reaction of aqueous $KMn{{O}_{4}}$ with ${{H}_{2}}{{O}_{2}}$ in acidic conditions gives             [AIPMT 2014]

A)
$M{{n}^{4+}}$and ${{O}_{2}}$

B)
$M{{n}^{2+}}$ and ${{O}_{2}}$

C)
$M{{n}^{2+}}$and ${{O}_{3}}$

D)
$M{{n}^{4+}}$and $Mn{{O}_{2}}$

• question_answer43) Reason of lanthanoid contraction is [AIPMT 2014]

A)
negligible screening effect of T orbitals

B)
increasing nuclear charge

C)
decreasing nuclear charge

D)
decreasing screening effect

• question_answer44) Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).        [NEET 2015 ]

A)
$Ti(22)and\,Zr(40)$

B)
$Zr(40)and\,Nb(41)$

C)
$Zr(40)and\,Hf\,(72)$

D)
$Zr(40)and\,Ta(73)$

• question_answer45) Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified $KMn{{O}_{4}}$ for complete oxidation?                           [NEET 2015 (Re)]

A)
$FeS{{O}_{4}}$

B)
$FeS{{O}_{3}}$

C)
$Fe{{C}_{2}}{{O}_{4}}$

D)
$Fe{{(N{{O}_{2}})}_{2}}$

• question_answer46) Which one of the following statements is correct when $\text{S}{{\text{O}}_{\text{2}}}$is passed through acidified ${{\text{K}}_{2}}C{{r}_{2}}{{O}_{7}}$solution?                              [NEET - 2016]

A)
The solution turns blue

B)
The solution is decolourized

C)
$\text{S}{{\text{O}}_{\text{2}}}$is reduced

D)
Green $C{{r}_{2}}{{(S{{O}_{4}})}_{3}}$is formed

• question_answer47) Which copper is heated with conc. $\text{HN}{{\text{O}}_{\text{3}}}$it produces                        [NEET - 2016]

A)
$\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}$and $\text{N}{{\text{O}}_{\text{2}}}$

B)
$\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}$ and NO

C)
$\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}},$NO and $\text{N}{{\text{O}}_{\text{2}}}$

D)
$\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}$and $\text{N}{{\text{O}}_{\text{2}}}$

• question_answer48) Name the gas that can readily decolourises acidified$KMn{{O}_{4}}$solution:          [NEET-2017]

A)
${{P}_{2}}{{O}_{5}}$

B)
$C{{O}_{2}}$

C)
$S{{O}_{2}}$

D)
$N{{O}_{2}}$

• question_answer49) The reason for greater range of oxidation states in actinoids is attributed to                  [NEET-2017]

A)
4f and 5d levels being close in energies

B)

C)
Actinoid contraction

D)
5f, 6d and 7s levels having comparable energies

• question_answer50) Which one of the following ions exhibits d-d transition and paramagnetism as well? [NEET - 2018]

A)
$\text{MnO}_{\text{4}}^{\text{-}}$

B)
$\text{C}{{\text{r}}_{\text{2}}}\text{O}_{\text{7}}^{\text{2-}}$

C)
$\text{CrO}_{4}^{\text{2-}}$

D)
$\text{MnO}_{\text{4}}^{\text{2-}}$

• question_answer51) The manganate and permanganate ions are tetrahedral due to-                      [NEET 2019]

A)
The $\pi$-bonding involves overlap of p-orbitals of oxygen with p-orbtials of manganese

B)
The $\pi$-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese

C)
The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

D)
There is no $\pi$-bonding

• question_answer52) Identify the incorrect statement.    [NEET 2020]

A)
The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

B)
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

C)
The oxidation states of chromium in $CrO_{4}^{2-}$ and $C{{r}_{2}}O_{4}^{2-}$ are not the same.

D)
$C{{r}^{2+}}({{d}^{4}})$ is a stronger reducing agent than $F{{e}^{2+}}({{d}^{6}})$ in water.