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Variable Oxidation States

Which of the ...

Question

Which of the following statements are correct about $Z n, C d$ and $H g$ ?
$(I)$ they exhibit high enthalpies of atomisation as the $d$ -subshell is full
$(I I)$ $Z n$ and $C d$ do not show variable oxidation states while $H g$ shows $+ I$ and $+ I I$
$(I I I)$ Compound of $Z n, C d$ and $H g$ are paramagnetic in nature
$(I V)$ $Z n, C d$ and $H g$ are called soft metals.

A

I, I I, I I I

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B

I, I I I

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C

I I, I V

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D

I V

only

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Solution

The correct option is C $I I, I V$
(i) Zn, Cd and Hg have low values of enthalpies of atomization. Thus statement (i) is incorrect.
(ii) Zn and Cd shows +2 oxidation state whereas Hg shows +1 and +2 oxidation state.Hence statement (ii) is correct.
(iii) All electrons are paired in the compounds of zinc. Hence, they are diamagnetic in nature. Hence, statement (iii) is incorrect.
(iv) Zn, Cd and Hg are soft metals as all electrons are paired and metallic bonds are not strong enough. Thus statement (iv) is correct.

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Similar questions

Q. Which of the comparison regarding

Z n, C d, H g

is/are correct?

Z n {C l}_{2}

is ionic whereas

C d {C l}_{2}

H g {C l}_{2}

Z n

C d

dissolves in dilute acid

(H C l)

H_{2}

H g

Z n

C d

forms precipitate of

Z n (O H)_{2}

C d {(O H)}_{2}

H g

forms coloured precipitate of

H g (O H)_{2}

A_{2}^{2 +}

Q. Account for the following:
(i) Transition metals show variable oxidation states.
(ii)

Z n, C d

H g

are soft metals.
(iii)

E^{\circ}

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

couple is highly positive

(+ 1.57 V)

C r^{3 +} / C r^{2 +}

Q. (a) Account for the following:
(i) Transition metals show variable oxidation states.
(ii) Zn, Cd and Hg are soft metals.
(iii)

E^{o}

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

couple is highly positive (+ 1.57 V) as compared to

C r^{3 +} / C r^{2 +}

.
(b) Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

Question 11
Which of the following metals exist in their native state in nature?
(i) $Cu$
(ii) $Au$
(iii) $Zn$
(iv) $Ag$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

Question 11
Which of the following metals exist in their native state in nature?
(i) $Cu$
(ii) $Au$
(iii) $Zn$
(iv) $Ag$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

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