321521 Number of elements that generally do not show variable valencies \(\mathrm{Cu}, \mathrm{Zn}, \mathrm{Au}, \mathrm{Cd}, \mathrm{Sc}, \mathrm{La}, \mathrm{Pt}, \mathrm{Co}\).

321522 Which of the following statements are correct?
(I) As a result of lanthanoid contraction members of \({\rm{4d}}\,\,{\rm{and}}\,\,{\rm{5d}}\) series exhibit similar radii.
(II) \(\mathrm{I E_{2}}\) is high for \(\mathrm{\mathrm{Cr}}\) and \(\mathrm{\mathrm{Cu}}\) whereas \(\mathrm{I E_{3}}\) is very high for \(\mathrm{\mathrm{Zn}}\).
(III) Heavier members of d-block elements like p-block elements favours lower oxidation states.
(IV) In any transition series maximum number of oxidation states is shown by middle elements or elements near middle elements.

321523 Which one of the following exhibits the largest number of oxidation states?

321524 Assertion :
\(\mathrm{Mn}^{2+}\) is more stable than \(\mathrm{Mn}^{3+}\).
Reason :
\(\mathrm{Mn}^{2+}\) has half-filled configuration.

321525 The metal that shows highest and maximum number of oxidation states is

321521 Number of elements that generally do not show variable valencies \(\mathrm{Cu}, \mathrm{Zn}, \mathrm{Au}, \mathrm{Cd}, \mathrm{Sc}, \mathrm{La}, \mathrm{Pt}, \mathrm{Co}\).

321522 Which of the following statements are correct?
(I) As a result of lanthanoid contraction members of \({\rm{4d}}\,\,{\rm{and}}\,\,{\rm{5d}}\) series exhibit similar radii.
(II) \(\mathrm{I E_{2}}\) is high for \(\mathrm{\mathrm{Cr}}\) and \(\mathrm{\mathrm{Cu}}\) whereas \(\mathrm{I E_{3}}\) is very high for \(\mathrm{\mathrm{Zn}}\).
(III) Heavier members of d-block elements like p-block elements favours lower oxidation states.
(IV) In any transition series maximum number of oxidation states is shown by middle elements or elements near middle elements.

321523 Which one of the following exhibits the largest number of oxidation states?

321524 Assertion :
\(\mathrm{Mn}^{2+}\) is more stable than \(\mathrm{Mn}^{3+}\).
Reason :
\(\mathrm{Mn}^{2+}\) has half-filled configuration.

321525 The metal that shows highest and maximum number of oxidation states is

321521 Number of elements that generally do not show variable valencies \(\mathrm{Cu}, \mathrm{Zn}, \mathrm{Au}, \mathrm{Cd}, \mathrm{Sc}, \mathrm{La}, \mathrm{Pt}, \mathrm{Co}\).

321522 Which of the following statements are correct?
(I) As a result of lanthanoid contraction members of \({\rm{4d}}\,\,{\rm{and}}\,\,{\rm{5d}}\) series exhibit similar radii.
(II) \(\mathrm{I E_{2}}\) is high for \(\mathrm{\mathrm{Cr}}\) and \(\mathrm{\mathrm{Cu}}\) whereas \(\mathrm{I E_{3}}\) is very high for \(\mathrm{\mathrm{Zn}}\).
(III) Heavier members of d-block elements like p-block elements favours lower oxidation states.
(IV) In any transition series maximum number of oxidation states is shown by middle elements or elements near middle elements.

321523 Which one of the following exhibits the largest number of oxidation states?

321524 Assertion :
\(\mathrm{Mn}^{2+}\) is more stable than \(\mathrm{Mn}^{3+}\).
Reason :
\(\mathrm{Mn}^{2+}\) has half-filled configuration.

321525 The metal that shows highest and maximum number of oxidation states is

321521 Number of elements that generally do not show variable valencies \(\mathrm{Cu}, \mathrm{Zn}, \mathrm{Au}, \mathrm{Cd}, \mathrm{Sc}, \mathrm{La}, \mathrm{Pt}, \mathrm{Co}\).

321522 Which of the following statements are correct?
(I) As a result of lanthanoid contraction members of \({\rm{4d}}\,\,{\rm{and}}\,\,{\rm{5d}}\) series exhibit similar radii.
(II) \(\mathrm{I E_{2}}\) is high for \(\mathrm{\mathrm{Cr}}\) and \(\mathrm{\mathrm{Cu}}\) whereas \(\mathrm{I E_{3}}\) is very high for \(\mathrm{\mathrm{Zn}}\).
(III) Heavier members of d-block elements like p-block elements favours lower oxidation states.
(IV) In any transition series maximum number of oxidation states is shown by middle elements or elements near middle elements.

321523 Which one of the following exhibits the largest number of oxidation states?

321524 Assertion :
\(\mathrm{Mn}^{2+}\) is more stable than \(\mathrm{Mn}^{3+}\).
Reason :
\(\mathrm{Mn}^{2+}\) has half-filled configuration.

321525 The metal that shows highest and maximum number of oxidation states is

321521 Number of elements that generally do not show variable valencies \(\mathrm{Cu}, \mathrm{Zn}, \mathrm{Au}, \mathrm{Cd}, \mathrm{Sc}, \mathrm{La}, \mathrm{Pt}, \mathrm{Co}\).

321522 Which of the following statements are correct?
(I) As a result of lanthanoid contraction members of \({\rm{4d}}\,\,{\rm{and}}\,\,{\rm{5d}}\) series exhibit similar radii.
(II) \(\mathrm{I E_{2}}\) is high for \(\mathrm{\mathrm{Cr}}\) and \(\mathrm{\mathrm{Cu}}\) whereas \(\mathrm{I E_{3}}\) is very high for \(\mathrm{\mathrm{Zn}}\).
(III) Heavier members of d-block elements like p-block elements favours lower oxidation states.
(IV) In any transition series maximum number of oxidation states is shown by middle elements or elements near middle elements.

321523 Which one of the following exhibits the largest number of oxidation states?

321524 Assertion :
\(\mathrm{Mn}^{2+}\) is more stable than \(\mathrm{Mn}^{3+}\).
Reason :
\(\mathrm{Mn}^{2+}\) has half-filled configuration.

321525 The metal that shows highest and maximum number of oxidation states is