321536
Statement A : Transition metals show variable valency. Statement B : Transition metals have a large energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and \(\mathrm{(n-1) d}\) electrons.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The Statement A is correct but the Statement \(\mathrm{\mathrm{B}}\) is incorrect. Transition metal show variable valency due to very small energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and (n-1)d electrons.
CHXII08:THE D- & F-BLOCK ELEMENTS
321537
Which element can have oxidation states from 4 to 6 ?
1 \(\mathrm{Fe}\)
2 \(\mathrm{Mg}\)
3 \(\mathrm{Co}\)
4 \(\mathrm{Cr}\)
Explanation:
Oxidation state of \({\text{d}}\) - block elements can vary, i.e. of \(\mathrm{Fe}, \mathrm{Co}\) and \(\mathrm{Cr}\) as follows: (1) (3) Oxidation state of \(\mathrm{Co}=(+) 2\) to \((+) 5\) and oxidation state of \(\mathrm{Fe}=(+) 2\) to \((+) 6\), but \((+) 6\) is less stable. Also \((+) 4\) and +5 oxidation states of \(\mathrm{Fe}\) are very rare. (4) Oxidation state of \(\mathrm{Cr}=(+) 2\) to \((+) 6\), and \((+) 6\) state is more stable. (2) Oxidation state of alkaline earth metals (i.e. \(\mathrm{Mg})\) is fixed and equal to \((+) 2\). Hence, option (4) is the correct.
321536
Statement A : Transition metals show variable valency. Statement B : Transition metals have a large energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and \(\mathrm{(n-1) d}\) electrons.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The Statement A is correct but the Statement \(\mathrm{\mathrm{B}}\) is incorrect. Transition metal show variable valency due to very small energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and (n-1)d electrons.
CHXII08:THE D- & F-BLOCK ELEMENTS
321537
Which element can have oxidation states from 4 to 6 ?
1 \(\mathrm{Fe}\)
2 \(\mathrm{Mg}\)
3 \(\mathrm{Co}\)
4 \(\mathrm{Cr}\)
Explanation:
Oxidation state of \({\text{d}}\) - block elements can vary, i.e. of \(\mathrm{Fe}, \mathrm{Co}\) and \(\mathrm{Cr}\) as follows: (1) (3) Oxidation state of \(\mathrm{Co}=(+) 2\) to \((+) 5\) and oxidation state of \(\mathrm{Fe}=(+) 2\) to \((+) 6\), but \((+) 6\) is less stable. Also \((+) 4\) and +5 oxidation states of \(\mathrm{Fe}\) are very rare. (4) Oxidation state of \(\mathrm{Cr}=(+) 2\) to \((+) 6\), and \((+) 6\) state is more stable. (2) Oxidation state of alkaline earth metals (i.e. \(\mathrm{Mg})\) is fixed and equal to \((+) 2\). Hence, option (4) is the correct.
321536
Statement A : Transition metals show variable valency. Statement B : Transition metals have a large energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and \(\mathrm{(n-1) d}\) electrons.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The Statement A is correct but the Statement \(\mathrm{\mathrm{B}}\) is incorrect. Transition metal show variable valency due to very small energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and (n-1)d electrons.
CHXII08:THE D- & F-BLOCK ELEMENTS
321537
Which element can have oxidation states from 4 to 6 ?
1 \(\mathrm{Fe}\)
2 \(\mathrm{Mg}\)
3 \(\mathrm{Co}\)
4 \(\mathrm{Cr}\)
Explanation:
Oxidation state of \({\text{d}}\) - block elements can vary, i.e. of \(\mathrm{Fe}, \mathrm{Co}\) and \(\mathrm{Cr}\) as follows: (1) (3) Oxidation state of \(\mathrm{Co}=(+) 2\) to \((+) 5\) and oxidation state of \(\mathrm{Fe}=(+) 2\) to \((+) 6\), but \((+) 6\) is less stable. Also \((+) 4\) and +5 oxidation states of \(\mathrm{Fe}\) are very rare. (4) Oxidation state of \(\mathrm{Cr}=(+) 2\) to \((+) 6\), and \((+) 6\) state is more stable. (2) Oxidation state of alkaline earth metals (i.e. \(\mathrm{Mg})\) is fixed and equal to \((+) 2\). Hence, option (4) is the correct.
321536
Statement A : Transition metals show variable valency. Statement B : Transition metals have a large energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and \(\mathrm{(n-1) d}\) electrons.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The Statement A is correct but the Statement \(\mathrm{\mathrm{B}}\) is incorrect. Transition metal show variable valency due to very small energy difference between the \(\mathrm{\mathrm{ns}^{2}}\) and (n-1)d electrons.
CHXII08:THE D- & F-BLOCK ELEMENTS
321537
Which element can have oxidation states from 4 to 6 ?
1 \(\mathrm{Fe}\)
2 \(\mathrm{Mg}\)
3 \(\mathrm{Co}\)
4 \(\mathrm{Cr}\)
Explanation:
Oxidation state of \({\text{d}}\) - block elements can vary, i.e. of \(\mathrm{Fe}, \mathrm{Co}\) and \(\mathrm{Cr}\) as follows: (1) (3) Oxidation state of \(\mathrm{Co}=(+) 2\) to \((+) 5\) and oxidation state of \(\mathrm{Fe}=(+) 2\) to \((+) 6\), but \((+) 6\) is less stable. Also \((+) 4\) and +5 oxidation states of \(\mathrm{Fe}\) are very rare. (4) Oxidation state of \(\mathrm{Cr}=(+) 2\) to \((+) 6\), and \((+) 6\) state is more stable. (2) Oxidation state of alkaline earth metals (i.e. \(\mathrm{Mg})\) is fixed and equal to \((+) 2\). Hence, option (4) is the correct.
