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 |
 76%
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Given below are two statements: 

Assertion (A): Cr2+ acts as a reducing agent and Mn3+ acts as an oxidising agent when both have d4 configuration.
Reason (R): The maximum oxidation state Cr show is +5 and Mn shows is +7.


 

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 but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  d-Block Elements- Properties & Uses |
 58%
From NCERT
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Assertion (A): The highest oxidation state of osmium is +8 .
Reason (R): Osmium is a 5d-block element.
 
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 but (R) is false.
4. Both (A) and (R) are false.

Subtopic:  d-Block Elements- Properties & Uses |
 65%
From NCERT
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Given below are two statements: 

Assertion (A): Cu cannot liberate hydrogen from acids.
Reason (R): Because it has positive electrode potential.

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 not true but (R) is true
4. Both (A) and (R) are false.

Subtopic:  d-Block Elements- Properties & Uses |
 88%
From NCERT
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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 (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 not true but (R) is true.
4. Both (A) and (R) are false.

Subtopic:  Lanthanoid & Actinoids Contraction |
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Given below are two statements: 

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 (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 not true but (R) is true
4. Both (A) and (R) are false.

Subtopic:  d-Block Elements- Properties & Uses |
 65%
From NCERT
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Assertion (A) Cu2+ iodide is not known.

Reason (R) Cu2+ 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 |
 72%
From NCERT
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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 and statement 2 is false.
2. Statement 1 is false and statement 2 is true.
3. Both statements are false.
4. Both statements are true.
Subtopic:  Lanthanoid & Actinoids Contraction |
 80%
From NCERT
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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 |
 66%
From NCERT
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Statement 1: Highest oxidation state of a metal is exhibited in its oxide or fluoride only.
Statement 2: Both oxide and fluoride ions are able to oxidise metals.

1. Statement 1 is true, statement 2 is false.

2. Statement 1 is false, statement 2 is true.

3. Both statements are true.

4. Both statements are false.
Subtopic:  d-Block Elements- Properties & Uses |
 76%
From NCERT
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