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Pick out the correct statements from the...

Pick out the correct statements from the following
1. Cobalt (III) is more stable in octahedral complexes
2. Zinc forms coloured complexes
3. Most of the d-block elements and their compounds are ferromagnetic
4. Osmium show (VIII) oxidation state
5. Cobalt (II) is more stable in octahedral complexes

A

1 and 2

B

1 and 3

C

2 and 4

D

1 and 4

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct statements from the given options, let's analyze each statement one by one: 1. **Cobalt (III) is more stable in octahedral complexes.** - Cobalt (III) typically forms stable octahedral complexes due to its ability to accommodate six ligands around it. This statement is **correct**. 2. **Zinc forms coloured complexes.** - Zinc has the electronic configuration of [Ar] 4s² 3d¹⁰. Since its d-orbitals are fully filled, it does not exhibit d-d transitions, which are responsible for color in transition metal complexes. Therefore, zinc complexes are generally colorless. This statement is **incorrect**. 3. **Most of the d-block elements and their compounds are ferromagnetic.** - Ferromagnetism is a property exhibited by certain d-block elements like iron, cobalt, and nickel. However, not all d-block elements are ferromagnetic; many are paramagnetic or diamagnetic. Therefore, this statement is **incorrect**. 4. **Osmium shows (VIII) oxidation state.** - Osmium can exhibit a +8 oxidation state, which is one of its highest oxidation states. Therefore, this statement is **correct**. 5. **Cobalt (II) is more stable in octahedral complexes.** - Cobalt (II) is indeed stable in octahedral complexes, but it is not necessarily more stable than cobalt (III) in octahedral complexes. However, cobalt (II) does form stable octahedral complexes. This statement is **correct**. ### Summary of Correct Statements: - Statement 1: Correct - Statement 2: Incorrect - Statement 3: Incorrect - Statement 4: Correct - Statement 5: Correct ### Final Answer: The correct statements are: - 1. Cobalt (III) is more stable in octahedral complexes. - 4. Osmium shows (VIII) oxidation state. - 5. Cobalt (II) is more stable in octahedral complexes.
To determine the correct statements from the given options, let's analyze each statement one by one: 1. **Cobalt (III) is more stable in octahedral complexes.** - Cobalt (III) typically forms stable octahedral complexes due to its ability to accommodate six ligands around it. This statement is **correct**. 2. **Zinc forms coloured complexes.** - Zinc has the electronic configuration of [Ar] 4s² 3d¹⁰. Since its d-orbitals are fully filled, it does not exhibit d-d transitions, which are responsible for color in transition metal complexes. Therefore, zinc complexes are generally colorless. This statement is **incorrect**. ...
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