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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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 |
 79%
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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 Statement II are true.
2. Statement I is true and Statement II is false.
3. Both Statements I and Statement II are false.
4. Statement I is false, Statement II is true.
Subtopic:  d-Block Elements- Properties & Uses |
 65%
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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 1 and Statement 2 are true.
4. Both Statements 1 and Statement 2 are false.
Subtopic:  d-Block Elements- Properties & Uses |
 76%
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Statement 1: Silver atom has completely filled d orbitals (4d10) in its ground state.
Statement 2: Silver is not a transition element.
 
1. Statement 1 is true , Statement 2 is false.
2. Statement 1 is false, Statement 1 is true.
3. Both Statements 1 and Statement 2 are true.
4. Both Statements 1 and Statement 2 are false.
Subtopic:  d-Block Elements- Properties & Uses |
 66%
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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 |
 57%
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The graph for M2+/M (standard electrode potential) is plotted for 3 d series elements below:

The element X is

1. Mn

2. Fe

3. Cu

4. Co

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Consider the graph between enthalpies of atomization of transition elements vs atomic numbers:

The curve representing enthalpies of atomization for 3d series is 

1. z

2. y

3. x

4. Cannot predict from the graph

Subtopic:  d-Block Elements- Properties & Uses |
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Consider the following graph.

Based on the graph above, it can be concluded that the element with a melting point higher than 3000 K will be:

1. Y 2. X
3. Z 4. None of the above
Subtopic:  d-Block Elements- Properties & Uses |
 90%
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Match the following:

Ions  Number of unpaired electrons
i. Mn3+ a. 2
ii. Cr3+ b. 4
iii. V3+ c. 1
iv. Ti3+ d. 3
 
i ii iii iv
1. c d b a
2. b d a c
3. d b a c
4. b d c a
Subtopic:  d-Block Elements- Properties & Uses |
 80%
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