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Atomic Radius

Which of the ...

Question

Which of the following does not represent the correct order of the property indicated?

A

S c^{3 +} > C r^{3 +} > F e^{3 +} > M n^{3 +}

- Ionic radii

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B

S c > T i > C r > M n

- Density

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C

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

- Ionic radii

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D

F e O < C a O > M n O > C u O

- Basic nature

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Solution

The correct options are
B $S c^{3 +} > C r^{3 +} > F e^{3 +} > M n^{3 +}$ - Ionic radii
D $S c > T i > C r > M n$ - Density
(A) Ionic size is inversely proportional to atomic number in a period. Thus, size order is $S c^{+ 3}$ > $C r^{+ 3}$ > $M n^{+ 3}$ > $F e^{+ 3}$ . Hence, option A is correct.
(B) The correct order of the density is $S c < T i < C r < M n$ . Hence, option B is correct. On moving from left to right, the density increases as the atomic mass increases and the atomic size decreases.
(C). The correct order of the ionic radii is $M n^{2 +} (82 p m) > N i^{2 +} (70 p m) < C o^{2 +} (74 p m) < F e^{2 +} (77 p m)$ . Hence, the option C is incorrect.
(D) Larger is the size of the cation, greater is the basic nature. Hence, the correct order for the ionic radii of the cations and the basic nature of the metal oxides is $F e O < C a O > M n O > C u O$ . Thus, option D is incorrect.

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Similar questions

Q. 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

M^{2 +} / M

M^{3 +} / M^{2 +}

E^{⊖}

values for some metals are as follows:

$C r^{2 +} / C r$	$- 0.9 V$ $	$C r^{3} / C r^{2 +}$	$- 0.4 V$
$M n^{2 +} / M n$	$- 1.2 V$	$M n^{3 +} / M n^{2 +}$	$+ 1.5 V$
$F e^{2 +} / F e$	$- 0.4 V$	$F e^{3 +} / F e^{2 +}$	$+ 0.8 V$

Use this data to comment upon:
(i) the stability of

F e^{3 +}

in acid solution as compared to that of

C r^{3 +}

M n^{3 +}

and
(ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal

Q. 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 ?

Q. 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 ?

Q. Balance the following ionic equations
(i)

C r_{2} O_{7}^{2 -} + H^{+} + I^{-} \to C r^{3 +} + I_{2} + H_{2} O

C r_{2} O_{7}^{2 -} + F e_{2}^{+} + H^{+} \to C r^{3 +} + F e^{3 +} + H_{2} O

M n O^{4 -} + S O_{3}^{2 -} + H^{+} \to M n^{2 +} + S O_{4}^{2 -} + H_{2} O

M n O^{4 -} + H^{+} + B r^{-} \to M n^{2 +} + B r_{2} + H_{2} O

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