d and f-Block Elements Test

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d and f-Block Elements Test - 22

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Question 1
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Cu²⁺ iodide is not known.
Reason (R): Cu²⁺ oxidises I– to iodine.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Cu²⁺ oxidises iodide to iodine hence cupric iodide is converted to cuprous iodide.
Question 2
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Transition metals have low melting points.
Reason (R): The involvement of greater number of (n – 1)d and ns electrons in the interatomic metallic bonding.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Transition metals have high melting points because of the involvement of greater number of (n – 1)d and ns electrons in the interatomic metallic bonding.
Question 3
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion: Separation of Zr and Hf is difficult.
Reason: Because Zr and Hf lie in the same group of the periodic table.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Separation of Zr and Hf is difficult as both have same size.
Question 4
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Chemistry of Actinoids is more complicated than Lanthanoids.
Reason (R): Actinoid elements are radioactive in nature.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Chemistry of actinoids is more complicated than Lanthanoids because actinoids are radioactive elements having relatively short half-lives.
Question 5
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The highest oxidation state of osmium is +8.
Reason (R): Osmium is a 5d-block element.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

The highest oxidation state of osmium (Os) is +8. It is due to its ability to expand octet by using its all 8 electrons.
Question 6
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Cu cannot liberate hydrogen from acids.
Reason (R): Because it has positive electrode potential.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Copper (Cu) does not liberate hydrogen from acids due to the presence of positive electrode potential.
Question 7
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Transition metals have high melting point.
Reason (R): Transition metals have completely filled d-orbitals.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Transition metals have high melting points because of the involvement of greater number of (n – 1)d and ns electrons in the interatomic metallic bonding.
Question 8
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Chromium is an actinoid.
Reason (R): In Chromium, 3d orbitals are filled.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Chromium is a transition element and it belongs to 3d series because in chromium, 3d orbitals are filled.
Question 9
1 / -0

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Cerium (Ce) exhibits +4 oxidation state.
Reason (R): Ce⁴⁺has 4f⁴ electronic configuration which is less stable.

A
A. Both A and R are true and R is the correct explanation of A.

B
B. Both A and R are true but R is NOT the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false and R is True.

Solution

Cerium exhibits +4 oxidation state because Ce⁴⁺ has 4f⁰ electronic configuration which is most stable.

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d and f-Block Elements Test - 22

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d and f-Block Elements Test - 22

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Question 1

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 2

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 3

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 4

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 5

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 6

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 7

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 8

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

Question 9

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is NOT the correct explanation of A.

C. A is true but R is false.

D. A is false and R is True.

Solution

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