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The d and f Block Elements

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The difference between spin only magnetic moment value of $[C o {(H_{2} O)}_{6} C l_{2} a n d C r {(H_{2} O)}_{6}] C l_{3}$ is _______________.

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Vishal Baghel

Contributor-Level 10

$[C o {(H_{2} O)}_{6}] C l_{2} \Rightarrow C o^{2 +} \Rightarrow 3 d^{7} \Rightarrow {t_{2 g}}^{5} e g^{2}$

Number of unpaired electrons = 3

$[C r {(H_{2} O)}_{6}] C l_{3} \Rightarrow C r^{3 +} \Rightarrow 3 d^{3} \Rightarrow {t_{2 g}}^{3} e g^{0}$

Number of unpaired electrons = 3

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The difference between spin only magnetic moment value of $[C o {(H_{2} O)}_{6} C l_{2} a n d C r {(H_{2} O)}_{6}] C l_{3}$ is _______________.

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF₄, MnF₃ and MnF₂ is_________B.M [nearest integer]

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alok kumar singh

Contributor-Level 10

$\overset{+ 4}{M n F_{4}}$ $\overset{+ 3}{M n F_{3}}$

E.C = [Ar] 3d³ [Ar]3d⁴

$\begin{matrix} \overset{+ 2}{M n F_{2}} & [A r] 3 d^{5} \end{matrix} [\begin{array}{l} E_{M n^{3 +} | M n^{2 +}}^{0} = 1.57 V \\ E_{M n^{4 +} | M n^{2 +}}^{0} = 1.27 V \end{array}]$

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The dark purple colour KMnO₄ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is:

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Vishal Baghel

Contributor-Level 10

$\overset{+ 7}{M} n O_{4}^{-} + 8 H^{+} + 5 e \to \overset{+ 2}{M} n^{2 +} + 4 H_{2} O$ change in oxidation number of Mn = 7 – 2 = 5

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

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alok kumar singh

Contributor-Level 10

Kindly go through the solution
$2 M n O_{4}^{-} + 5 H_{2} O_{2} + 6 H^{+} \to 2 M n^{2 +} + 8 H_{2} O + 5 O_{2}$

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

Which of the following pair is not isoelectronic species?

(At. No, Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)

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Vishal Baghel

Contributor-Level 10

No. of electron = 62 – 2 = 60

$6 8^{E r^{+ 3}}$ No. of electron = 68 – 3 = 65

$7 0^{Y b^{+ 2}}$ No. of electron = 70 – 2 = 68

$7 1^{L u + 3}$ No. of electron = 71 – 3 = 68

$6 5^{T b^{+ 4}}$ No. of electron = 65 – 4 = 61

$6 3^{E u^{+ 2}}$ No. of electron = 63 – 2 = 61

$6 5^{T b^{+ 2}}$ No. of electron = 65 – 2 = 63

$6 9^{T m^{+ 4}}$ No. of electron = 69 – 4 = 65

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

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

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Payal Gupta

Contributor-Level 10

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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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

In neutral of faintly alkaline medium KMnO₄ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be:

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Vishal Baghel

Contributor-Level 10

Following is the reaction of KMnO4 in basic medium with thiosulphate anion.

$\overset{+ 7}{8 M n O_{4}^{-}} + 3 S_{2} O_{3}^{- -} + H_{2} O \to \overset{+ 4}{8 M n O_{2 |}} + 6 S O_{4}^{- -} + 2 O H^{-}$

Change = 7 – 4 = 3

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

In following pairs, the one in which both transition metal ions are colourless is:

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Vishal Baghel

Contributor-Level 10

$S c^{3 +} - 3 d^{0}$ electron in last subshell

$Z n^{2 +} - 3 d^{10}$ electron in last subshell

$T i^{4 +} - 3 d^{0}$ electron in last subshell

$C u^{2 +} - 3 d^{9}$ electron in last subshell

$V^{2 +} - 3 d^{3}$ electron in last subshell

$T i^{3 +} - 3 d^{1}$ electron in last subshell

$M n^{2 +} - 3 d^{5}$ electron in last subshell

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The d and f Block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

The incorrect statement(s) among (a) - (c) is (are):

(a) $W (V I)$ is more stable than $C r (V I)$ .

(b) In the presence of $H C l$ , permanganate titrations provide satisfactory results.

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alok kumar singh

Contributor-Level 10

Sol. (i) Foam - Froth (e)

(ii) Gel - Jellies (c)
(iii) Aerosol - smoke (a)
(iv) Emulsion - milk (f)

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