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Question

Which of the following arrangements does not represent the correct order of the property stated against it?
$N i^{2 +} < C o^{2 +} < F e^{2 +} < M n^{2 +}$ : Ionic size
$C o^{3 +} < F e^{3 +} < C r^{3 +} < S c^{3 +}$ : Stability in aqueous solution
$S c < T i < C r < M n$ : Number of oxidation states
$V^{2 +} < C r^{2 +} < M n^{2 +} < F e^{2 +}$ : Paramagnetic behaviour

A

V^{2 +} < C r^{2 +} < M n^{2 +} < F e^{2 +}

: Paramagnetic behaviour

B

S c < T i < C r < M n

: Number of oxidation states

C

N i^{2 +} < C o^{2 +} < F e^{2 +} < M n^{2 +}

: Ionic size

D

C o^{3 +} < F e^{3 +} < C r^{3 +} < S c^{3 +}

: Stability in aqueous solution

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Solution

Verified by Toppr

The exothermic hydration enthalpies of the given trivalent cations are:
$S c^{+ 3} = 3960 k J / m o l e$
$F e^{+ 3} = 4429 k J / m o l e$
$C o^{+ 3} = 4653 k J / m o l e$
$C r^{+ 3} = 4563 k J / m o l e$
Hence, $S c^{+ 3}$ is least hydrated, i.e., least stable (not most stable).
$F$ e $^{+ 2}$ contains 4 unpaired electrons whereas $M n^{+ 2}$ contains 5 unpaired electrons.

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Similar Questions

Q1

Which of the following arrangments does not represent the correct order of the property stated against it?
(1)

V^{2 +} < C r^{2 +} < M n^{2} < F e^{2 +}

: paramagnetic behaviour
(2)

N i^{2 +} < C o^{2 +} < F e^{2 +} < M n^{2 +}

: ionic size
(3)

C o^{3 +} < F e^{3 +} < C r^{3 +} < S c^{3 +}

: stability in aqueous solution
(4)

S c < T i < C r < M n

: number of oxidation states

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Q2

Consider the ions

F e^{2 +}, F e^{3 +}, C r^{2 +}, C r^{3 +}, M n^{2 +}, M n^{3 +}

. Strongest oxidizing ion is ?

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Q3

The d-electron configurations of

C r^{2 +}, M n^{2 +}, F e^{2 +}

and

C o^{2 +}

are

d^{4}, d^{5}, d^{6}

and

d^{^{7}}

respectively. Which one of the following will exhibit minimum paramagnetic behaviour ?

(Atomic numbers of Cr

= 24, M n = 25, F e = 26, C o = 27)

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Q4

The $d$ electron configuration of $C r^{2 +}, M n^{2 +}, F e^{2 +}$ and $N i^{2 +}$ are $3 d^{4}, 3 d^{5}, 3 d^{6}$ and $3 d^{8}$ respectively. Which one of the following aqua complexes will exhibit the maximum paramagnetic behaviour?

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Q5

Consider the ions

F e^{2 +}, F e^{3 +}, C r^{2 +}, C r^{3 +}, M n^{2 +}, M n^{3 +}

. Strongest reducing ion is ?

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