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Protons

Which of the ...

Question

Which of the following represents the incorrect order of the properties indicated?

A

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

(size)

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B

S c > T i > C r > M n

(size)

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C

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

(unpaired electron)

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D

H_{3} A s O_{4} > H_{3} {P O}_{4}

(acidic strength order)

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Solution

The correct options are
A ${N i}^{2 +} > {C r}^{2 +} > {F e}^{2 +} > {M n}^{2 +}$ (size)
D $H_{3} A s O_{4} > H_{3} {P O}_{4}$ (acidic strength order)
${C r}^{2 +} > {M n}^{2 +} > {F e}^{2 +} > {N i}^{2 +} >$ is the correct size order. Also, the acidic strength of $H_{3} A s O_{4} < H_{3} {P O}_{4}$ as $P$ is more electronegative than $A s$ .

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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

Q. The stabilities of coordination compounds containing the ions

C u^{2 +}, N i^{2 +}, C o^{2 +}, F e^{2 +}

M n^{2 +}

follow the order:

Q. Magnetic moments of

M^{2 +}

ions (divalent cations ) of 3d-series in the decreasing order is :

Z n^{2 +} > S c^{2 +} = C u^{2 +} > T i^{2 +} = N i^{2 +} > V^{2 +} = C o^{2 +} > C r^{2 +} = F e^{2 +} > M n^{2 +}

Is the above statement true?

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?

Q. Which one of the following ions has an electronic configuration of

[A r] 3 d^{10}

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