Quiz - chemistry - D and F block elements-PYQ

Q1. $\text{Sc} (\text{Z} = 21)$ is a transition element but $\text{Zn} (\text{Z} = 30)$ is not because Source: orcusprep.in

NEET 2013

easy

both $\text{Sc}^{3+}$ and $\text{Zn}^{2+}$ ions are colourless and form white compounds

in case of $\text{Sc}$, $3d$ orbitals are partially filled but in $\text{Zn}$ these are filled

last electron is assumed to be added to $4s$ level in case of $\text{Zn}$

both $\text{Sc}$ and $\text{Zn}$ do not exhibit variable oxidation states

Q2. Which of the following ions has electronic configuration $[ ext{Ar}]3d^6$? Source: orcusprep.in

AIPMT 2010

easy

$\text{Ni}^{3+}$

$\text{Mn}^{3+}$

$\text{Fe}^{3+}$

$\text{Co}^{3+}$

Q3. Among the following series of transition metal ions, the one where all metal ions have $3d^2$ electronic configuration is $\text{[At. nos. } \text{Ti} = 22, \text{V} = 23, \text{Cr} = 24, \text{Mn} = 25]$ Source: orcusprep.in

AIPMT 2004

medium

$\text{Ti}^{3+}, \text{V}^{2+}, \text{Cr}^{3+}, \text{Mn}^{4+}$

$\text{Ti}^{+}, \text{V}^{4+}, \text{Cr}^{6+}, \text{Mn}^{7+}$

$\text{Ti}^{4+}, \text{V}^{3+}, \text{Cr}^{2+}, \text{Mn}^{3+}$

$\text{Ti}^{2+}, \text{V}^{3+}, \text{Cr}^{4+}, \text{Mn}^{5+}$

Q4. Which of the following configuration is correct for iron? Source: orcusprep.in

AIPMT 1999

easy

$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7$

$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5$

$1s^2 2s^2 2p^6 3s^2 3p^6 3d^5$

$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6$

Q5. Which of the following has more unpaird $d$-electrons? Source: orcusprep.in

AIPMT 1999

easy

$\text{N}^{3+}$

$\text{Fe}^{2+}$

$\text{Zn}^{+}$

$\text{Cu}^{+}$

Q6. The electronic configuration of transition elements is exhibited by Source: orcusprep.in

AIPMT 1996

easy

$ns^1$

$ns^2 np^5$

$ns^2 (n – 1)d^{1–10}$

$ns^2 (n – 1)d^{10}$

Q7. The electronic configurations of four elements are given below. Which element does not belong to the same family as others? $\text{(a) } [ ext{Xe}]4f^{14}5d^{10}6s^2$, $\text{(b) } [ ext{Kr}]4d^{10}5s^2$, $\text{(c) } [ ext{Ne}]3s^2 3p^5$, $\text{(d) } [ ext{Ar}]3d^{10}4s^2$ Source: orcusprep.in

AIPMT 1989

medium

$[ ext{Xe}]4f^{14}5d^{10}6s^2$

$[ ext{Kr}]4d^{10}5s^2$

$[ ext{Ne}]3s^2 3p^5$

$[ ext{Ar}]3d^{10}4s^2$

Q8. Identify the incorrect statement. Source: orcusprep.in

NEET 2020

medium

$\text{Cr}^{2+} (d^4)$ is a stronger reducing agent than $\text{Fe}^{2+} (d^6)$ in water.

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.

Interstitial compounds are those that are formed when small atoms like $\text{H}, \text{C}$ or $\text{N}$ are trapped inside the crystal lattices of metals.

The oxidation states of chromium in $\text{CrO}_4^{2-}$ and $\text{Cr}_2\text{O}_7^{2-}$ are not the same.

Q9. The calculated spin only magnetic moment of $\text{Cr}^{2+}$ ion is Source: orcusprep.in

NEET 2020

easy

3.87 BM

4.90 BM

5.92 BM

2.84 BM

Q10. Match the metal ions given in Column-I with the spin magnetic moments of the ions given in Column-II and assign the correct code : $\text{A. } \text{Co}^{3+}, \text{B. } \text{Cr}^{3+}, \text{C. } \text{Fe}^{3+}, \text{D. } \text{Ni}^{2+}$. $\text{Column-II: } (\text{i}) \sqrt{8} \text{ B.M.}, (\text{ii}) \sqrt{35} \text{ B.M.}, (\text{iii}) \sqrt{15} \text{ B.M.}, (\text{iv}) \sqrt{24} \text{ B.M.}$ Source: orcusprep.in

NEET 2018

medium

(iv) (v) (ii) (i)

(i) (ii) (iii) (iv)

(iv) (i) (ii) (iii)

(iii) (v) (i) (ii)

Q11. Magnetic moment $\mathbf{2.84 \text{ B.M.}}$ is given by $\text{[At. nos. } \text{Ni} = 28, \text{Ti} = 22, \text{Cr} = 24, \text{Co} = 27]$ Source: orcusprep.in

AIPMT 2015

easy

$\text{Cr}^{2+}$

$\text{Co}^{2+}$

$\text{Ni}^{2+}$

$\text{Ti}^{3+}$

Q12. Which of the following processes does not involve oxidation of iron? Source: orcusprep.in

AIPMT 2015

medium

Formation of $\text{Fe}(\text{CO})_5$ from $\text{Fe}$.

Liberation of $\text{H}_2$ from steam by iron at high temperature.

Rusting of iron sheets.

Decolourisation of blue $\text{CuSO}_4$ solution by iron.

Q13. Which of the following statements about the interstitial compounds is incorrect? Source: orcusprep.in

NEET 2013

easy

They are much harder than the pure metal.

They have higher melting points than the pure metal.

They retain metallic conductivity.

They are chemically reactive.

Q14. Identify the alloy containing a non-metal as a constituent in it. Source: orcusprep.in

AIPMT 2012

easy

Invar

Steel

Bell metal

Bronze

Q15. The catalytic activity of transition metals and their compounds is ascribed mainly to Source: orcusprep.in

AIPMT Mains 2012

easy

their magnetic behaviour

their unfilled $d$-orbitals

their ability to adopt variable oxidation states

their chemical reactivity.

Q16. Which one of the following does not correctly represent the correct order of the property indicated against it? Source: orcusprep.in

AIPMT Mains 2012

medium

$\text{Ti} < \text{V} < \text{Cr} < \text{Mn}$; increasing number of oxidation states

$\text{Ti}^{3+} < \text{V}^{3+} < \text{Cr}^{3+} < \text{Mn}^{3+}$ : increasing magnetic moment

$\text{Ti} < \text{V} < \text{Cr} < \text{Mn} : \text{increasing melting points}$

$\text{Ti} < \text{V} < \text{Mn} < \text{Cr} : \text{increasing } 2^{\text{nd}} \text{ ionization enthalpy}$

Q17. Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential ($E^\circ_{\text{M}^{2+}/\text{M}}$) value has a positive sign? Source: orcusprep.in

AIPMT Mains 2012

easy

$\text{Co} (\text{Z} = 27)$

$\text{Ni} (\text{Z} = 28)$

$\text{Cu} (\text{Z} = 29)$

$\text{Fe} (\text{Z} = 26)$

Q18. For the four successive transition elements ($ ext{Cr}, \text{Mn}, \text{Fe}$ and $\text{Co}$), the stability of $+2$ oxidation state will be there in which of the following order? $\text{[At. nos. } \text{Cr} = 24, \text{Mn} = 25, \text{Fe} = 26, \text{Co} = 27]$ Source: orcusprep.in

AIPMT 2011

medium

$\text{Mn} > \text{Fe} > \text{Cr} > \text{Co}$

$\text{Fe} > \text{Mn} > \text{Co} > \text{Cr}$

$\text{Co} > \text{Mn} > \text{Fe} > \text{Cr}$

$\text{Cr} > \text{Mn} > \text{Co} > \text{Fe}$

Q19. Which of the following ions will exhibit colour in aqueous solutions? $\text{[Z} = 57, 22, 71, 21]$ Source: orcusprep.in

AIPMT 2010

easy

$\text{La}^{3+}$

$\text{Ti}^{3+}$

$\text{Lu}^{3+}$

$\text{Sc}^{3+}$

Q20. Which of the following pairs has the same size? $\text{[Z} = 26, 28, 40, 22, 72, 30]$ Source: orcusprep.in

AIPMT 2010

easy

$\text{Fe}^{2+}, \text{Ni}^{2+}$

$\text{Zr}^{4+}, \text{Ti}^{4+}$

$\text{Zr}^{4+}, \text{Hf}^{4+}$

$\text{Zn}^{2+}, \text{Hf}^{4+}$

Q21. Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? Source: orcusprep.in

AIPMT 2009

easy

$3d^5 4s^1$

$3d^5 4s^2$

$3d^2 4s^2$

$3d^3 4s^2$

Q22. The correct order of decreasing second ionisation enthalpy of $\text{Ti}(22), \text{V}(23), \text{Cr}(24) \text{ and } \text{Mn}(25)$ is Source: orcusprep.in

AIPMT 2008

medium

$\text{Mn} > \text{Cr} > \text{Ti} > \text{V}$

$\text{Ti} > \text{V} > \text{Cr} > \text{Mn}$

$\text{Cr} > \text{Mn} > \text{V} > \text{Ti}$

$\text{V} > \text{Mn} > \text{Cr} > \text{Ti}$

Q23. In which of the following pairs are both the ions coloured in aqueous solution? $\text{[At. no. : } \text{Sc} = 21, \text{Ti} = 22, \text{Ni} = 28, \text{Cu} = 29, \text{Co} = 27]$ Source: orcusprep.in

AIPMT 2006

easy

$\text{Ni}^{2+}, \text{Cu}^{+}$

$\text{Ni}^{2+}, \text{Ti}^{3+}$

$\text{Sc}^{3+}, \text{Ti}^{3+}$

$\text{Sc}^{3+}, \text{Co}^{2+}$

Q24. 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 ionisation enthalpy? Source: orcusprep.in

AIPMT 2005

medium

$\text{Vanadium } (\text{Z} = 23)$

$\text{Chromium } (\text{Z} = 24)$

$\text{Manganese } (\text{Z} = 25)$

$\text{Iron } (\text{Z} = 26)$

Q25. The aqueous solution containing which one of the following ions will be colourless? $\text{[Atomic number : } \text{Sc} = 21, \text{Fe} = 26, \text{Ti} = 22, \text{Mn} = 25]$ Source: orcusprep.in

AIPMT 2005

easy

$\text{Sc}^{3+}$

$\text{Fe}^{2+}$

$\text{Ti}^{3+}$

$\text{Mn}^{2+}$

Q26. Which one of the following characteristics of the transition metals is associated with their catalytic activity? Source: orcusprep.in

AIPMT 2003

easy

High enthalpy of atomization

Paramagnetic behaviour

Colour of hydrated ions

Variable oxidation states

Q27. The basic character of the transition metal monoxides follows the order $\text{[Atomic no’s. } \text{Ti} = 22, \text{V} = 23, \text{Cr} = 24, \text{Fe} = 26]$ Source: orcusprep.in

AIPMT 2003

medium

$\text{VO} > \text{CrO} > \text{TiO} > \text{FeO}$

$\text{CrO} > \text{VO} > \text{FeO} > \text{TiO}$

$\text{TiO} > \text{FeO} > \text{VO} > \text{CrO}$

$\text{TiO} > \text{VO} > \text{CrO} > \text{FeO}$

Q28. Which of the following shows maximum number of oxidation states? Source: orcusprep.in

AIPMT 2002

easy

$\text{Cr}$

$\text{Fe}$

$\text{Mn}$

$\text{V}$

Q29. Which ion is colourless? Source: orcusprep.in

AIPMT 2000

easy

$\text{Cr}^{4+}$

$\text{Sc}^{3+}$

$\text{Ti}^{3+}$

$\text{V}^{3+}$

Q30. Bell metal is an alloy of Source: orcusprep.in

AIPMT 1999

easy

$\text{Cu} + \text{Zn}$

$\text{Cu} + \text{Sn}$

$\text{Cu} + \text{Pb}$

$\text{Cu} + \text{Ni}$

Q31. In which of the following compounds transition metal has zero oxidation state? Source: orcusprep.in

AIPMT 1999

easy

$\text{NOClO}_4$

$\text{NH}_2\text{NH}_2$

$\text{CrO}_5$

$\text{[Fe}(\text{CO})_5]$

Q32. Which one of the following ionic species will impart colour to an aqueous solution? Source: orcusprep.in

AIPMT 1998

easy

$\text{Zn}^{2+}$

$\text{Cu}^{+}$

$\text{Ti}^{4+}$

$\text{Cr}^{3+}$

Q33. A transition element $\text{X}$ has a configuration $[ ext{Ar}]3d^4$ in its $+3$ oxidation state. Its atomic number is Source: orcusprep.in

AIPMT 1996

medium

22

19

25

26

Q34. Amongst $\text{TiF}_6^{2-}, \text{CoF}_6^{3-}, \text{Cu}_2\text{Cl}_2$ and $\text{NiCl}_4^{2-}$, which are the colourless species? $\text{[Atomic number of } \text{Ti} = 22, \text{Co} = 27, \text{Cu} = 29, \text{Ni} = 28]$ Source: orcusprep.in

AIPMT 1995

medium

$\text{CoF}_6^{3-} \text{ and } \text{NiCl}_4^{2-}$

$\text{TiF}_6^{2-} \text{ and } \text{Cu}_2\text{Cl}_2$

$\text{Cu}_2\text{Cl}_2 \text{ and } \text{NiCl}_4^{2-}$

$\text{TiF}_6^{2-} \text{ and } \text{CoF}_6^{3-}$

Q35. The mercury is the only metal which is liquid at $0^\circ\text{C}$. This is due to its Source: orcusprep.in

AIPMT 1995

easy

high vapour pressure

weak metallic bond

high ionization energy

both (b) and (c).

Q36. The manganate and permanganate ions are tetrahedral, due to Source: orcusprep.in

NEET 2019

medium

the $\pi$-bonding involves overlap of $d$-orbitals of oxygen with $d$-orbitals of manganese

the $\pi$-bonding involves overlap of $p$-orbitals of oxygen with $d$-orbitals of manganese

there is no $\pi$-bonding

the $\pi$-bonding involves overlap of $p$-orbitals of oxygen with $p$-orbitals of manganese.

Q37. When neutral or faintly alkaline $\text{KMnO}_4$ is treated with potassium iodide, iodide ion is converted into ‘$\text{X}$’. ‘$\text{X}$’ is Source: orcusprep.in

NEET 2019

medium

$\text{I}_2$

$\text{IO}_4^{-}$

$\text{IO}_3^{-}$

$\text{IO}^{-}$

Q38. Which one of the following ions exhibits $d-d$ transition and paramagnetism as well? Source: orcusprep.in

NEET 2018

medium

$\text{CrO}_4^{2-}$

$\text{Cr}_2\text{O}_7^{2-}$

$\text{MnO}_4^{-}$

$\text{MnO}_4^{2-}$

Q39. Name the gas that can readily decolourise acidified $\text{KMnO}_4$ solution. Source: orcusprep.in

NEET 2017

easy

$\text{SO}_2$

$\text{NO}_2$

$\text{P}_2\text{O}_5$

$\text{CO}_2$

Q40. Which one of the following statements is correct when $\text{SO}_2$ is passed through acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution? Source: orcusprep.in

NEET 2016

easy

$\text{SO}_2$ is reduced.

Green $\text{Cr}_2(\text{SO}_4)_3$ is formed.

The solution turns blue.

The solution is decolourised.

Q41. Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified $\text{KMnO}_4$ for complete oxidation? Source: orcusprep.in

AIPMT 2015

hard

$\text{FeSO}_3$

$\text{FeC}_2\text{O}_4$

$\text{Fe}(\text{NO}_2)_2$

$\text{FeSO}_4$

Q42. The reaction of aqueous $\text{KMnO}_4$ with $\text{H}_2\text{O}_2$ in acidic conditions gives Source: orcusprep.in

AIPMT 2014

easy

$\text{Mn}^{4+} \text{ and } \text{O}_2$

$\text{Mn}^{2+} \text{ and } \text{O}_2$

$\text{Mn}^{2+} \text{ and } \text{O}_3$

$\text{Mn}^{4+} \text{ and } \text{MnO}_2$.

Q43. Which of the statements is not true? Source: orcusprep.in

AIPMT 2012

medium

On passing $\text{H}_2\text{S}$ through acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution, a milky colour is observed.

$\text{Na}_2\text{Cr}_2\text{O}_7$ is preferred over $\text{K}_2\text{Cr}_2\text{O}_7$ in volumetric analysis.

$\text{K}_2\text{Cr}_2\text{O}_7$ solution in acidic medium is orange.

$\text{K}_2\text{Cr}_2\text{O}_7$ solution becomes yellow on increasing the $\text{pH}$ beyond 7.

Q44. Acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution turns green when $\text{Na}_2\text{SO}_3$ is added to it. This is due to the formation of Source: orcusprep.in

AIPMT 2011

easy

$\text{Cr}_2(\text{SO}_4)_3$

$\text{CrO}_4^{2-}$

$\text{Cr}_2(\text{SO}_3)_3$

$\text{CrSO}_4$

Q45. The number of moles of $\text{KMnO}_4$ reduced by one mole of $\text{KI}$ in alkaline medium is Source: orcusprep.in

AIPMT 2005

medium

one

two

five

one fifth.

Q46. $\text{K}_2\text{Cr}_2\text{O}_7$ on heating with aqueous $\text{NaOH}$ gives Source: orcusprep.in

AIPMT 1997

easy

$\text{Cr}_2\text{O}_7^{2-}$

$\text{Cr}(\text{OH})_2$

$\text{CrO}_4^{2-}$

$\text{Cr}(\text{OH})_3$

Q47. $\text{KMnO}_4$ reacts with oxalic acid according to the equation $2\text{MnO}_4^{-} + 5\text{C}_2\text{O}_4^{2-} + 16\text{H}^{+} \to 2\text{Mn}^{2+} + 10\text{CO}_2 + 8\text{H}_2\text{O}$. Here $\mathbf{20 \text{ mL } \text{ of } 0.1 \text{ M } \text{KMnO}_4}$ is equivalent to Source: orcusprep.in

AIPMT 1996

medium

50 $\text{mL}$ of $0.5 \text{ M } \text{C}_2\text{H}_2\text{O}_4$

20 $\text{mL}$ of $0.1 \text{ M } \text{C}_2\text{H}_2\text{O}_4$

20 $\text{mL}$ of $0.5 \text{ M } \text{C}_2\text{H}_2\text{O}_4$

50 $\text{mL}$ of $0.1 \text{ M } \text{C}_2\text{H}_2\text{O}_4$

Q48. The oxidation state of $\text{Cr}$ in $\text{K}_2\text{Cr}_2\text{O}_7$ is Source: orcusprep.in

AIPMT 1988

easy

$+5$

$+3$

$+6$

$+7$

Q49. Which one of the following statements related to lanthanons is incorrect? Source: orcusprep.in

NEET 2016

medium

Europium shows $+2$ oxidation state.

The basicity decreases as the ionic radius decreases from $\text{Pr}$ to $\text{Lu}$.

All the lanthanons are much more reactive than aluminium.

$\text{Ce}(+4)$ solutions are widely used as oxidizing agent in volumetric analysis.

Q50. The electronic configurations of $\text{Eu}$ ($ ext{Z}=63$), $\text{Gd}$ ($ ext{Z}=64$) and $\text{Tb}$ ($ ext{Z}=65$) are Source: orcusprep.in

NEET 2016

medium

$[ ext{Xe}]4f^6 5d^1 6s^2, [ ext{Xe}]4f^7 5d^1 6s^2 \text{ and } [ ext{Xe}]4f^8 5d^1 6s^2$

$[ ext{Xe}]4f^7 6s^2, [ ext{Xe}]4f^7 5d^1 6s^2 \text{ and } [ ext{Xe}]4f^9 6s^2$

$[ ext{Xe}]4f^7 6s^2, [ ext{Xe}]4f^8 6s^2 \text{ and } [ ext{Xe}]4f^8 5d^1 6s^2$

$[ ext{Xe}]4f^6 5d^1 6s^2, [ ext{Xe}]4f^7 5d^1 6s^2 \text{ and } [ ext{Xe}]4f^9 6s^2$

Q51. Gadolinium belongs to $4f$ series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium? Source: orcusprep.in

AIPMT 2015

easy

$[ ext{Xe}] 4f^9 5s^1$

$[ ext{Xe}] 4f^7 5d^1 6s^2$

$[ ext{Xe}] 4f^6 5d^2 6s^2$

$[ ext{Xe}] 4f^8 6d^2$

Q52. Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? $\text{[Numbers in the parenthesis are atomic numbers]}$ Source: orcusprep.in

AIPMT 2015

easy

$\text{Zr}(40) \text{ and } \text{Hf}(72)$

$\text{Zr}(40) \text{ and } \text{Ta}(73)$

$\text{Ti}(22) \text{ and } \text{Zr}(40)$

$\text{Zr}(40) \text{ and } \text{Nb}(41)$

Q53. Reason of lanthanoid contraction is Source: orcusprep.in

AIPMT 2014

easy

negligible screening effect of ‘$f$’-orbitals

increasing nuclear charge

decreasing nuclear charge

decreasing screening effect.

Q54. Which of the following lanthanoid ions is diamagnetic? $\text{[At. nos. } \text{Ce} = 58, \text{Sm} = 62, \text{Eu} = 63, \text{Yb} = 70]$ Source: orcusprep.in

NEET 2013

medium

$\text{Eu}^{2+}$

$\text{Yb}^{2+}$

$\text{Ce}^{2+}$

$\text{Sm}^{2+}$

Q55. Which of the following oxidation states is the most common among the lanthanoids? Source: orcusprep.in

AIPMT Mains 2010

easy

$4$

$2$

$5$

$3$

Q56. Identify the incorrect statement among the following : Source: orcusprep.in

AIPMT 2007

medium

Lanthanoid contraction is the accumulation of successive shrinkages.

As a result of lanthanoid contraction, the properties of $4d$ series of the transition elements have no similarities with the $5d$ series of elements.

Shielding power of $4f$ electrons is quite weak.

There is a decrease in the radii of the atoms or ions as one proceeds from $\text{La}$ to $\text{Lu}$.

Q57. Lanthanoids are Source: orcusprep.in

AIPMT 2004

easy

$14$ elements in the sixth period (atomic no. 90 to 103) that are filling $4f$ sublevel

$14$ elements in the seventh period (atomic number $= 90$ to 103) that are filling $5f$ sublevel

$14$ elements in the sixth period (atomic number $= 58$ to 71) that are filling the $4f$ sublevel

$14$ elements in the seventh period (atomic number $= 58$ to 71) that are filling $4f$ sublevel.

Q58. The correct order of ionic radii of $\text{Y}^{3+}, \text{La}^{3+}, \text{Eu}^{3+} \text{ and } \text{Lu}^{3+}$ is $\text{[At. nos. } \text{Y} = 39, \text{La} = 57, \text{Eu} = 63, \text{Lu} = 71]$ Source: orcusprep.in

AIPMT 2003

medium

$\text{Y}^{3+} < \text{La}^{3+} < \text{Eu}^{3+} < \text{Lu}^{3+}$

$\text{Y}^{3+} < \text{Lu}^{3+} < \text{Eu}^{3+} < \text{La}^{3+}$

$\text{Lu}^{3+} < \text{Eu}^{3+} < \text{La}^{3+} < \text{Y}^{3+}$

$\text{La}^{3+} < \text{Eu}^{3+} < \text{Lu}^{3+} < \text{Y}^{3+}$

Q59. General electronic configuration of lanthanides is Source: orcusprep.in

AIPMT 2002

easy

$(n – 2) f^{1 – 14} (n – 1) s^2 p^6 d^{0 – 1} ns^2$

$(n – 2) f^{10 – 14} (n – 1) d^{0 – 1} ns^2$

$(n – 2) f^{0 – 14} (n – 1) d^{10} ns^2$

$(n – 2) d^{0 – 1} (n – 1) f^{1 – 14} ns^2$

Q60. Which of the following statement is not correct? Source: orcusprep.in

AIPMT 2001

medium

$\text{La}(\text{OH})_3$ is less basic than $\text{Lu}(\text{OH})_3$.

In lanthanide series ionic radius of $\text{Ln}^{3+}$ ion decreases.

$\text{La}$ is actually an element of transition series rather lanthanides.

Atomic radius of $\text{Zn}$ and $\text{Hf}$ are same because of lanthanide contraction.

Q61. The lanthanide contraction is responsible for the fact that Source: orcusprep.in

AIPMT 1997

easy

$\text{Zr}$ and $\text{Hf}$ have about the same radius

$\text{Zr}$ and $\text{Zn}$ have the same oxidation state

$\text{Zr}$ and $\text{Y}$ have about the same radius

$\text{Zr}$ and $\text{Nb}$ have similar oxidation state.

Q62. Which of the following statements concerning lanthanide elements is false? Source: orcusprep.in

AIPMT 1994

medium

All lanthanides are highly dense metals.

More characteristic oxidation state of lanthanide elements is $+3$.

Lanthanides are separated from one another by ion exchange method.

Ionic radii of trivalent lanthanides steadily increases with increase in the atomic number.

Q63. The reason for greater range of oxidation states in actinoids is attributed to Source: orcusprep.in

NEET 2017

easy

actinoid contraction

$5f, 6d \text{ and } 7s \text{ levels having comparable energies}$

$4f \text{ and } 5d \text{ levels being close in energies}$

the radioactive nature of actinoids.

Q64. Which of the following exhibits only $+3$ oxidation state? Source: orcusprep.in

AIPMT Mains 2012

medium

$\text{U}$

$\text{Th}$

$\text{Ac}$

$\text{Pa}$

Q65. More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is Source: orcusprep.in

AIPMT 2006

easy

more active nature of the actinoids

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

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

greater metallic character of the lanthanoids than that of the corresponding actinoids.

Q66. Which one of the following elements shows maximum number of different oxidation states in its compounds? Source: orcusprep.in

AIPMT 1998

medium

$\text{Gd}$

$\text{La}$

$\text{Eu}$

$\text{Am}$

Q67. Match the catalyst with the process : Catalyst ($ ext{i}$) $\text{V}_2\text{O}_5$, ($ ext{ii}$) $\text{TiCl}_4 + \text{Al}(\text{CH}_3)_3$, ($ ext{iii}$) $\text{PdCl}_2$, ($ ext{iv}$) $\text{Nickel complexes of ethylene}$. Process ($ ext{p}$) The oxidation of ethyne to ethanal, ($ ext{q}$) Polymerisation of alkynes, ($ ext{r}$) Oxidation of $\text{SO}_2$ in the manufacture of $\text{H}_2\text{SO}_4$, ($ ext{s}$) Polymerisation of ethylene. Which of the following is the correct option? Source: orcusprep.in

NEET 2019

medium

(i)-(r), (ii)-(s), (iii)-(p), (iv)-(q)

(i)-(p), (ii)-(q), (iii)-(r), (iv)-(s)

(i)-(p), (ii)-(r), (iii)-(q), (iv)-(s)

(i)-(r), (ii)-(p), (iii)-(s), (iv)-(q)

Q68. $\text{HgCl}_2$ and $\text{I}_2$ both when dissolved in water containing $\text{I}^{-}$ ions, the pair of species formed is Source: orcusprep.in

NEET 2017

medium

$\text{HgI}_2, \text{I}^{-}$

$\text{HgI}_4^{2-}, \text{I}_3^{-}$

$\text{Hg}_2\text{I}_2, \text{I}^{-}$

$\text{HgI}_2, \text{I}_3^{-}$

Q69. Which of the following elements is responsible for oxidation of water to $\text{O}_2$ in biological processes? Source: orcusprep.in

AIPMT 1997

easy

$\text{Cu}$

$\text{Mo}$

$\text{Fe}$

$\text{Mn}$

Q70. When calomel reacts with $\text{NH}_4\text{OH}$, we get Source: orcusprep.in

AIPMT 1996

medium

$\text{Hg}_2\text{O}$

$\text{HgO}$

$\text{HgNH}_2\text{Cl}$

$\text{NH}_2 — \text{Hg} — \text{Hg} — \text{Cl}$

Q71. Photographic films and plates have an essential ingredient of Source: orcusprep.in

AIPMT 1989

easy

silver nitrate

silver bromide

sodium chloride

oleic acid.

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Chemistry - D and F block elements-PYQ

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Chemistry - D and F block elements-PYQ

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