Assertion(A): Ni++ has two unpaired electrons.
Reason(R): Electrons are removed from 3d but not from 4s.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.

Subtopic:  d-Block Elements- Properties & Uses |
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Assertion (A): $$Eu^{2+}$$ behaves as a reducing agent
Reason (R): +3 oxidation state of lanthanoids are more common

1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false

Subtopic:  f-Block Elements- Properties & Uses |
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Assertion( A): Cr2+ acts as a reducing agent and Mn3+ acts as an oxidising agent when both have d4 configuration.

Reason: The maximum oxidation state Cr show is +5 and Mn shows is +7.

1. Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

3. Assertion is true but the reason is false.

4. Assertion is false but the reason is true.

Subtopic:  d-Block Elements- Properties & Uses |
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Assertion (A) The highest oxidation state of osmium is +8 .

Reason (R) Osmium is a 5d-block element.

1. Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2. Both assertion and reason are true but the reason is not the correct explanation of assertion.

3. Assertion is not true but the reason is true.

4. Both assertion and reason are false.

Subtopic:  d-Block Elements- Properties & Uses |
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Assertion: Cu cannot liberate hydrogen from acids.

Reason: Because it has positive electrode potential.

1. Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2. Both assertion and reason are true but the reason is not the correct explanation of assertion.

3. Assertion is not true but the reason is true.

4. Both assertion and reason are false.

Subtopic:  d-Block Elements- Properties & Uses |
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Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids.

Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

1.  Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2.  Both assertion and reason are true but the reason is not the correct explanation of assertion.

3.  Assertion is not true but the reason is true.

4.  Both assertion and reason are false.

Subtopic:  Lanthanoid & Actinoids Contraction |
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Assertion (A) Separation of Zr and Hf is difficult.

Reason (R) Because Zr and Hf lie in the same group of the periodic table.

1.  Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2.  Both assertion and reason are true but the reason is not the correct explanation of assertion.

3.  Assertion is not true but the reason is true.

4.  Both assertion and reason are false.

Subtopic:  d-Block Elements- Properties & Uses |
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Assertion (A) C${\mathrm{u}}^{2+}$ iodide is not known.

Reason (R) C${\mathrm{u}}^{2+}$ oxidises ${I}^{-}$ to iodine.

1.  Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2.  Both assertion and reason are true but the reason is not the correct explanation of assertion.

3.  Assertion is not true but the reason is true.

4.  Both assertion and reason are false.

Subtopic:  d-Block Elements- Properties & Uses |
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Statement 1: Actinoid contraction is greater from element to element than lanthanoid contraction.
Statement 2:  5f orbitals have a poorer shielding effect than 4f orbitals.

1. Statement 1 is true, statement 2 is false.
2. Statement 1 is false, statement 2 is true.
3. Both statements are false.
4. Both statements are true.
Subtopic:  Lanthanoid & Actinoids Contraction |
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Statement I: Cr2+ is a stronger reducing agent than Fe2+ .
Statement II:  Fe2+ is a stronger reducing agent than Cr2+ .

1. Both statements I and II are true.

2. Statement I is true and statement II is false.
3. Both statements I and II are false.
4. Statement I is false, statement II is true.

Subtopic:  d-Block Elements- Properties & Uses |
To view explanation, please take trial in the course below.
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