Identify the incorrect statement. The d- and f-Block Elements [2020]

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Q.
Identify the incorrect statement. [2020]

1 ${Cr}^{2 +} (d^{4})$ is a stronger reducing agent than ${Fe}^{2 +} (d^{6})$ in water.

2 The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

Solution

Q.
Identify the incorrect statement. [2020]

1 ${Cr}^{2 +} (d^{4})$ is a stronger reducing agent than ${Fe}^{2 +} (d^{6})$ in water.

2 The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

3 Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

4 The oxidation states of chromium in ${CrO}_{4}^{2 -}$ and ${Cr}_{2} O_{7}^{2 -}$ are not the same.

Ans.
(4)

The oxidation states of Cr in ${CrO}_{4}^{2 -}$ and ${Cr}_{2} O_{7}^{2 -}$ is same i.e., +6.

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Solution

Q. Identify the incorrect statement. [2020]

1 Cr2+(d4) is a stronger reducing agent than Fe2+(d6) in water.

2 The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

3 Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

4 The oxidation states of chromium in CrO42- and Cr2O72- are not the same.

Ans. (4) The oxidation states of Cr in CrO42- and Cr2O72- is same i.e., +6.

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Q.
Identify the incorrect statement. [2020]

1 ${Cr}^{2 +} (d^{4})$ is a stronger reducing agent than ${Fe}^{2 +} (d^{6})$ in water.

4 The oxidation states of chromium in ${CrO}_{4}^{2 -}$ and ${Cr}_{2} O_{7}^{2 -}$ are not the same.

Ans.
(4)

The oxidation states of Cr in ${CrO}_{4}^{2 -}$ and ${Cr}_{2} O_{7}^{2 -}$ is same i.e., +6.