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 3 d block is considered not as a transition element (q) Copper (c) The metal which does not exhibit variable oxidation states (r) Manganese (d) The metal which in + 1 oxidation state in aqueous solution undergoes disproportionation (s) Zinc

(a)-(r), (b)-(s), (c)-(p), (d)-(q)

(a)-(p), (b)-(s), (c)-(q), (d)-(r)

(a)-(r), (b)-(p), (c)-(s), (d)-(q)

(a)-(q), (b)-(s), (c)-(p), (d)-(r)

The incorrect statement among the following is:

Most of the trivalent Lanthanoid ions are colorless in the solid state.

Actinoid contraction is greater for element to element than Lanthanoid contraction.

Lanthanoids are good conductors of heat and electricity.

Actinoids are highly reactive metals, especially when finely divided.

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

having similar chemical properties

Identify the incorrect statement from the following:

lanthanoid reveal only + 3 oxidation state.

Zirconium and Hafnium have identical radii of 160 pm and 159 pm , respectively as a consequence of lanthanoid contraction.

The lanthanoid ions other than the f 0 type and the f 14 type are all paramagnetic.

The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.

Reason of lanthanoid contraction is:

Negligible screening effect of 'f’ orbitals

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 5th May 2019>Q 8

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IMPORTANT

Earn 100

The manganate and permanganate ions are tetrahedral, due to:

64.71% studentsanswered this correctly

Important Questions on The d- and f-Block Elements

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 6th May 2018>Q 9

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. $\sqrt{8} B . M .$
b. ${Cr}^{3 +}$	ii. $\sqrt{35} B . M .$
c. ${Fe}^{3 +}$	iii. $\sqrt{3} B . M .$
d. ${Ni}^{2 +}$	iv. $\sqrt{24} B . M .$
	v. $\sqrt{15} B . M$

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 6th May 2018>Q 10

Which one of the following ions exhibits d-d transition and paramagnetism as well?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 7th May 2017>Q 11

Name the gas that can readily decolourise acidified

{KMnO}_{4}

solution.

EASY

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 7th May 2017>Q 12

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

EASY

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 24th July 2016>Q 13

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

HARD

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>NEET - 1st May 2016>Q 14

Which one of the following statements is correct when

S O_{2}

is passed through acidified

K_{2} C r_{2} O_{7}

solution?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>AIPMT - 3rd May 2015>Q 15

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

HARD

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 21 - The d- and f-Block Elements>AIPMT - 3rd May 2015>Q 16

Spin only magnetic moment