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CHXII08:THE D- & F-BLOCK ELEMENTS

321241 Which of the following are amphoteric oxides? ${Mn}_{2} O_{7}, {CrO}_{3}, {Cr}_{2} O_{3}, CrO, V_{2} O_{5}, V_{2} O_{4}$

1

V_{2} O_{5}, {Cr}_{2} O_{3}

2

{Mn}_{2} O_{7}, {CrO}_{3}

3

CrO, V_{2} O_{5}

4

V_{2} O_{5}, V_{2} O_{4}

CHXII08:THE D- & F-BLOCK ELEMENTS

321242 Which one of the following ions exhibits $d - d$ transition and paramagnetism as well?

1

{MnO}_{4}^{-}

2

{MnO}_{4}^{2 -}

3

{Cr}_{2} O_{7}^{2 -}

4

{CrO}_{4}^{2 -}

Explanation:

${MnO}_{4}^{2 -}$
Oxidation number of $Mn$ is +6
$Mn (25) = 3 d^{5} 4 s^{2}$
$M n^{6 +} = 3 d^{1}$
It has one unpaired electron so it behaves as paramagnetic substance and also undergo $d - d$ transition.

NEET - 2018

CHXII08:THE D- & F-BLOCK ELEMENTS

321243 Which oxide of manganese is amphoteric.?

1

{MnO}_{2}

2

{Mn}_{2} O_{3}

3

{Mn}_{2} O_{7}

4

MnO

Explanation:

${MnO}_{2}$ is amphoteric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321244 Choose the correct statements from the following.
(I) ${Mn}_{2} O_{7}$ is an oil at room temperature.
(II) $V_{2} O_{4}$ reacts with acid to give ${VO}_{2}^{2 +}$ .
(III) CrO is a basic oxide.
(IV) $V_{2} O_{5}$ does not react with acid.
Choose the correct answer from the options given below

1 (I) and (III) only

2 (I), (II) and (III) only

3 (II) and (III) only

4 (I), (II) and (IV) only

Explanation:

$V_{2} O_{4}$ dissolves in acids to give ${VO}^{2 +}$ salts. $V_{2} O_{5}$ is amphoteric in nature, reacts with acids as well as alkalies to give ${VO}_{4}^{3 -}$ and ${VO}_{4}^{+}$ . So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321241 Which of the following are amphoteric oxides? ${Mn}_{2} O_{7}, {CrO}_{3}, {Cr}_{2} O_{3}, CrO, V_{2} O_{5}, V_{2} O_{4}$

1

V_{2} O_{5}, {Cr}_{2} O_{3}

2

{Mn}_{2} O_{7}, {CrO}_{3}

3

CrO, V_{2} O_{5}

4

V_{2} O_{5}, V_{2} O_{4}

CHXII08:THE D- & F-BLOCK ELEMENTS

321242 Which one of the following ions exhibits $d - d$ transition and paramagnetism as well?

1

{MnO}_{4}^{-}

2

{MnO}_{4}^{2 -}

3

{Cr}_{2} O_{7}^{2 -}

4

{CrO}_{4}^{2 -}

Explanation:

${MnO}_{4}^{2 -}$
Oxidation number of $Mn$ is +6
$Mn (25) = 3 d^{5} 4 s^{2}$
$M n^{6 +} = 3 d^{1}$
It has one unpaired electron so it behaves as paramagnetic substance and also undergo $d - d$ transition.

NEET - 2018

CHXII08:THE D- & F-BLOCK ELEMENTS

321243 Which oxide of manganese is amphoteric.?

1

{MnO}_{2}

2

{Mn}_{2} O_{3}

3

{Mn}_{2} O_{7}

4

MnO

Explanation:

${MnO}_{2}$ is amphoteric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321244 Choose the correct statements from the following.
(I) ${Mn}_{2} O_{7}$ is an oil at room temperature.
(II) $V_{2} O_{4}$ reacts with acid to give ${VO}_{2}^{2 +}$ .
(III) CrO is a basic oxide.
(IV) $V_{2} O_{5}$ does not react with acid.
Choose the correct answer from the options given below

1 (I) and (III) only

2 (I), (II) and (III) only

3 (II) and (III) only

4 (I), (II) and (IV) only

Explanation:

$V_{2} O_{4}$ dissolves in acids to give ${VO}^{2 +}$ salts. $V_{2} O_{5}$ is amphoteric in nature, reacts with acids as well as alkalies to give ${VO}_{4}^{3 -}$ and ${VO}_{4}^{+}$ . So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321241 Which of the following are amphoteric oxides? ${Mn}_{2} O_{7}, {CrO}_{3}, {Cr}_{2} O_{3}, CrO, V_{2} O_{5}, V_{2} O_{4}$

1

V_{2} O_{5}, {Cr}_{2} O_{3}

2

{Mn}_{2} O_{7}, {CrO}_{3}

3

CrO, V_{2} O_{5}

4

V_{2} O_{5}, V_{2} O_{4}

CHXII08:THE D- & F-BLOCK ELEMENTS

321242 Which one of the following ions exhibits $d - d$ transition and paramagnetism as well?

1

{MnO}_{4}^{-}

2

{MnO}_{4}^{2 -}

3

{Cr}_{2} O_{7}^{2 -}

4

{CrO}_{4}^{2 -}

Explanation:

${MnO}_{4}^{2 -}$
Oxidation number of $Mn$ is +6
$Mn (25) = 3 d^{5} 4 s^{2}$
$M n^{6 +} = 3 d^{1}$
It has one unpaired electron so it behaves as paramagnetic substance and also undergo $d - d$ transition.

NEET - 2018

CHXII08:THE D- & F-BLOCK ELEMENTS

321243 Which oxide of manganese is amphoteric.?

1

{MnO}_{2}

2

{Mn}_{2} O_{3}

3

{Mn}_{2} O_{7}

4

MnO

Explanation:

${MnO}_{2}$ is amphoteric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321244 Choose the correct statements from the following.
(I) ${Mn}_{2} O_{7}$ is an oil at room temperature.
(II) $V_{2} O_{4}$ reacts with acid to give ${VO}_{2}^{2 +}$ .
(III) CrO is a basic oxide.
(IV) $V_{2} O_{5}$ does not react with acid.
Choose the correct answer from the options given below

1 (I) and (III) only

2 (I), (II) and (III) only

3 (II) and (III) only

4 (I), (II) and (IV) only

Explanation:

$V_{2} O_{4}$ dissolves in acids to give ${VO}^{2 +}$ salts. $V_{2} O_{5}$ is amphoteric in nature, reacts with acids as well as alkalies to give ${VO}_{4}^{3 -}$ and ${VO}_{4}^{+}$ . So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321241 Which of the following are amphoteric oxides? ${Mn}_{2} O_{7}, {CrO}_{3}, {Cr}_{2} O_{3}, CrO, V_{2} O_{5}, V_{2} O_{4}$

1

V_{2} O_{5}, {Cr}_{2} O_{3}

2

{Mn}_{2} O_{7}, {CrO}_{3}

3

CrO, V_{2} O_{5}

4

V_{2} O_{5}, V_{2} O_{4}

CHXII08:THE D- & F-BLOCK ELEMENTS

321242 Which one of the following ions exhibits $d - d$ transition and paramagnetism as well?

1

{MnO}_{4}^{-}

2

{MnO}_{4}^{2 -}

3

{Cr}_{2} O_{7}^{2 -}

4

{CrO}_{4}^{2 -}

Explanation:

${MnO}_{4}^{2 -}$
Oxidation number of $Mn$ is +6
$Mn (25) = 3 d^{5} 4 s^{2}$
$M n^{6 +} = 3 d^{1}$
It has one unpaired electron so it behaves as paramagnetic substance and also undergo $d - d$ transition.

NEET - 2018

CHXII08:THE D- & F-BLOCK ELEMENTS

321243 Which oxide of manganese is amphoteric.?

1

{MnO}_{2}

2

{Mn}_{2} O_{3}

3

{Mn}_{2} O_{7}

4

MnO

Explanation:

${MnO}_{2}$ is amphoteric oxide.

CHXII08:THE D- & F-BLOCK ELEMENTS

321244 Choose the correct statements from the following.
(I) ${Mn}_{2} O_{7}$ is an oil at room temperature.
(II) $V_{2} O_{4}$ reacts with acid to give ${VO}_{2}^{2 +}$ .
(III) CrO is a basic oxide.
(IV) $V_{2} O_{5}$ does not react with acid.
Choose the correct answer from the options given below

1 (I) and (III) only

2 (I), (II) and (III) only

3 (II) and (III) only

4 (I), (II) and (IV) only

Explanation:

$V_{2} O_{4}$ dissolves in acids to give ${VO}^{2 +}$ salts. $V_{2} O_{5}$ is amphoteric in nature, reacts with acids as well as alkalies to give ${VO}_{4}^{3 -}$ and ${VO}_{4}^{+}$ . So, the correct option is (1).

JEE Main - 2024

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