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The d-And-f-Block Elements

Short Answer Type

301.

Assigns reasons for the following:
(i) Transition metals exhibit enthalpy of atomisation.
(ii) Transition metals form interstitial compounds.

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302.

Explain why:
(i) Transition elements are metals?
(ii) Lanthanides are uniformly trivalent?

160 Views

303.

Write the preparation of :
(i) Potassium dichromate from chromite.
(ii) KMnO₄ from pyrolusite.

236 Views

Long Answer Type

304.

What is lanthanide contraction? How does it occur? What are its consequences?

316 Views

Short Answer Type

305.

How do you explain the paramagnetism and colour exhibited by compounds of transition metals?

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306.

Write the electronic configuration of ₂₅Mn²⁺.

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307.
Vanadium ion has a magnetic moment of 1.73 BM. What is the symbol of the ion? (Atomic number of V = 23)

Magnetic moment can be calculated by the using formula

$μ = \sqrt{n (n + 2)}$

As, we have given magnetic moment 1.73B.M so

1.73 = $\sqrt{n (n + 2)}$

taking both side saqure

(1.73)² =( $\sqrt{n (n + 2)}$ )²

2.99 =n(n+2)

2.99 =n² +2n

n² +2n-2.99 =0
solving above equation, we get
n=1

Thus, Vanadium ion must have one unpaired electron .
electronic configuration is [Ar] 4s² 3d¹.