QBManager

CHXII08:THE D- & F-BLOCK ELEMENTS

321659 Which of the following elements have pseudoinert gas configuration in the $(n - 1)$ shell?

1 Typical transition elements

2 Zinc group elements

3 Both

4 Neither

Explanation:

Elements which contains 18 electrons in its valence shell are known as pseudo inert gas configuration i.e., $(n - 1) d^{10} n s^{2} n p^{6}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321660 Platinum, palladium and iridium are called noble metals because

1 They are used as catalysts

2 They are inert towards many common reagents

3 They are shining lustrous pleasing to look at

4 They are found in active state

Explanation:

$Pt, Pd$ and Ir are called noble metals because they are inert towards many common reagents.

CHXII08:THE D- & F-BLOCK ELEMENTS

321661 Assertion :
Promethium is a manmade element.
Reason :
It is radioactive and has been prepared by artificial means.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321662 Among the following, the one that is not considered as a typical transition element.

1 chromium

2 manganese

3 cobalt

4 zinc

Explanation:

By definition, a transition element contain an incompletely filled d-subshell. With its $3 d^{10}$ configuration, zinc does not fall under this definition. Transition elements are metallic solids with high melting and boiling points. Zinc has a melting point of only $420^{\circ} C$ and a relatively low boiling point of $907^{\circ} C$ . Zinc is also a metallic solid, which forms a variety of complexes like other transition elements. Hence zinc is not considered as a typical transition element.

CHXII08:THE D- & F-BLOCK ELEMENTS

321659 Which of the following elements have pseudoinert gas configuration in the $(n - 1)$ shell?

1 Typical transition elements

2 Zinc group elements

3 Both

4 Neither

Explanation:

Elements which contains 18 electrons in its valence shell are known as pseudo inert gas configuration i.e., $(n - 1) d^{10} n s^{2} n p^{6}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321660 Platinum, palladium and iridium are called noble metals because

1 They are used as catalysts

2 They are inert towards many common reagents

3 They are shining lustrous pleasing to look at

4 They are found in active state

Explanation:

$Pt, Pd$ and Ir are called noble metals because they are inert towards many common reagents.

CHXII08:THE D- & F-BLOCK ELEMENTS

321661 Assertion :
Promethium is a manmade element.
Reason :
It is radioactive and has been prepared by artificial means.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321662 Among the following, the one that is not considered as a typical transition element.

1 chromium

2 manganese

3 cobalt

4 zinc

Explanation:

By definition, a transition element contain an incompletely filled d-subshell. With its $3 d^{10}$ configuration, zinc does not fall under this definition. Transition elements are metallic solids with high melting and boiling points. Zinc has a melting point of only $420^{\circ} C$ and a relatively low boiling point of $907^{\circ} C$ . Zinc is also a metallic solid, which forms a variety of complexes like other transition elements. Hence zinc is not considered as a typical transition element.

CHXII08:THE D- & F-BLOCK ELEMENTS

321659 Which of the following elements have pseudoinert gas configuration in the $(n - 1)$ shell?

1 Typical transition elements

2 Zinc group elements

3 Both

4 Neither

Explanation:

Elements which contains 18 electrons in its valence shell are known as pseudo inert gas configuration i.e., $(n - 1) d^{10} n s^{2} n p^{6}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321660 Platinum, palladium and iridium are called noble metals because

1 They are used as catalysts

2 They are inert towards many common reagents

3 They are shining lustrous pleasing to look at

4 They are found in active state

Explanation:

$Pt, Pd$ and Ir are called noble metals because they are inert towards many common reagents.

CHXII08:THE D- & F-BLOCK ELEMENTS

321661 Assertion :
Promethium is a manmade element.
Reason :
It is radioactive and has been prepared by artificial means.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321662 Among the following, the one that is not considered as a typical transition element.

1 chromium

2 manganese

3 cobalt

4 zinc

Explanation:

By definition, a transition element contain an incompletely filled d-subshell. With its $3 d^{10}$ configuration, zinc does not fall under this definition. Transition elements are metallic solids with high melting and boiling points. Zinc has a melting point of only $420^{\circ} C$ and a relatively low boiling point of $907^{\circ} C$ . Zinc is also a metallic solid, which forms a variety of complexes like other transition elements. Hence zinc is not considered as a typical transition element.

CHXII08:THE D- & F-BLOCK ELEMENTS

321659 Which of the following elements have pseudoinert gas configuration in the $(n - 1)$ shell?

1 Typical transition elements

2 Zinc group elements

3 Both

4 Neither

Explanation:

Elements which contains 18 electrons in its valence shell are known as pseudo inert gas configuration i.e., $(n - 1) d^{10} n s^{2} n p^{6}$

CHXII08:THE D- & F-BLOCK ELEMENTS

321660 Platinum, palladium and iridium are called noble metals because

1 They are used as catalysts

2 They are inert towards many common reagents

3 They are shining lustrous pleasing to look at

4 They are found in active state

Explanation:

$Pt, Pd$ and Ir are called noble metals because they are inert towards many common reagents.

CHXII08:THE D- & F-BLOCK ELEMENTS

321661 Assertion :
Promethium is a manmade element.
Reason :
It is radioactive and has been prepared by artificial means.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII08:THE D- & F-BLOCK ELEMENTS

321662 Among the following, the one that is not considered as a typical transition element.

1 chromium

2 manganese

3 cobalt

4 zinc

Explanation:

By definition, a transition element contain an incompletely filled d-subshell. With its $3 d^{10}$ configuration, zinc does not fall under this definition. Transition elements are metallic solids with high melting and boiling points. Zinc has a melting point of only $420^{\circ} C$ and a relatively low boiling point of $907^{\circ} C$ . Zinc is also a metallic solid, which forms a variety of complexes like other transition elements. Hence zinc is not considered as a typical transition element.