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Block D and F Elements

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4 months ago

Block D and F Elements Class 12th

Correct formula of calamine is

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alok kumar singh

Contributor-Level 10

Kindly go thorugh the solution

Calamine->ZnCO₃

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Block D and F Elements Class 12th

Among the given options, enthalpy of atomisation is maximum for

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alok kumar singh

Contributor-Level 10

Element	V	Ti	Mn	Sc
DaH/kJ mol^–1	515	473	281	326

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Block D and F Elements Class 12th

Which of the following is an example of ferrimagnetic substance?

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alok kumar singh

Contributor-Level 10

Fe₃O₄ is a ferrimagnetic substance

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5 months ago

Block D and F Elements Class 12th

The aqueous solution containing which one of the following ions will be colourless?

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alok kumar singh

Contributor-Level 10

Zn₂₊ has no unpaired electron and colourless in aqueous solution.

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Block D and F Elements Class 12th

Given below are two statements:

Statement I : CeO₂ can be used for oxidation of aldehydes and ketones.

Statement II : Aqueous solution of EuSO₄ is a strong reducing agent.

In the light of the above statements, choose the correct answer from the options given below:

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Vishal Baghel

Contributor-Level 10

In Ce & Eu (+3) oxidation state is more stable

$∴ C e^{+ 4} + e^{-} \to C e^{+ 3} (R e d u c t i o n)$ so CeO₂ is oxidising agent

$E u^{+ 2} \to E u^{+ 3} + e - (o x i d a t i o n)$ so EuSO₄ is reducing agent

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Block D and F Elements Class 12th

Spin only magnetic moment of ${[M n B r_{6}]}^{4 -}$ is________ B.M (round off to the closest integer)

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Vishal Baghel

Contributor-Level 10

$M n^{2 +} \overset{}{\to} t_{2 g^{111}} {e_{g}}^{11}$

(Number of unpaired electron = 5)

$μ_{S} = \sqrt[]{35} = 5.91 ≅ 6$

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Block D and F Elements Class 12th

The spin- only magnetic moment value of the most basic oxide of vanadium among V₂O₃, V₂O₄ and V₂O₅ is _____________B. M (Nearest integer)

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alok kumar singh

Contributor-Level 10

Most basic oxide V₂O₃

Here V has +3 O.S. Hence V⁺³ -> $[A r] 3 d^{2}$

two unpaired e^- in d- subshell

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5 months ago

Block D and F Elements Class 12th

Given below are two statements:

Statement I : In CuSO₄.5H₂O, Cu-O bonds are present

Statement II : In CuSO₄.5H₂O, ligands coordinating with Cu(II) ion are O- and S- based ligands

In the light of the above statements, choose Correct answer from the options given below:

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Vishal Baghel

Contributor-Level 10

From the given structure of CuSO₄. 5H₂O Cu (II) ion and oxygen bonds are present but ligands coordinating with Cu (II) ion are not O and S both.

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Block D and F Elements Class 12th

Which one of the lanthanoids given below is the most stable in divalent form?

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Raj Pandey

Contributor-Level 9

Valence shell electronic configuration of Eu in +2 O.S is,

$E u^{2 +} = 6 s^{0} 4 f^{7}$

It has half filled f-sub shell and stable.

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Block D and F Elements Class 12th

The IUPAC nomenclature of an element with electronic configuration [Rn] 5f¹⁴6d¹7s² is:

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Raj Pandey

Contributor-Level 9

IUPAC nomenclature of element with atomic no. 103 is uniltrium

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