QBManager

9 RBTS PAPER

162423 Melting point of transition metals is plotted in the graph given below :
Identify C, B, A in the graph respectively.

1 Cr, Tc, W

2 W, Mo, Cr

3

Mn, Cr, Tc

4

W, Tc, Cr

NCERT-XII-92

9 RBTS PAPER

162424 Which of the following statement concerning lanthanide elements is false :

1 More characteristic oxidation state of lanthanide elements is +3

2 Lanthanides are separated from one another by ion exchange method

3 lonic radii of trivalent lanthandies steadily increases with increase in the atomic number.

4 None of these

NCERT-XII-109

9 RBTS PAPER

162415 Atomic number of that element which is most abundant transition metal in earth crust :

1 8

2 27

3 26

4 13

NCERT-XII-90

9 RBTS PAPER

162416 The correct order of ionic radii of $Ce, Pm$ and $Yb$ in +3 oxidation state is :

1

{Pm}^{3 +} < {Ce}^{3 +} < {Yb}^{3 +}

2

{Ce}^{3 +} < {Pm}^{3 +} < {Yb}^{3 +}

3

{Yb}^{3 +} < {Ce}^{3 +} < {Pm}^{3 +}

4

{Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}

Explanation:

Lanthamide contraction decreases ionic sizes from ${La}^{3 +}$ to ${Lu}^{3 +}$ . Hence the correct order will be ${Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}$ .

NCERT-XII-109

9 RBTS PAPER

162423 Melting point of transition metals is plotted in the graph given below :
Identify C, B, A in the graph respectively.

1 Cr, Tc, W

2 W, Mo, Cr

3

Mn, Cr, Tc

4

W, Tc, Cr

NCERT-XII-92

9 RBTS PAPER

162424 Which of the following statement concerning lanthanide elements is false :

1 More characteristic oxidation state of lanthanide elements is +3

2 Lanthanides are separated from one another by ion exchange method

3 lonic radii of trivalent lanthandies steadily increases with increase in the atomic number.

4 None of these

NCERT-XII-109

9 RBTS PAPER

162415 Atomic number of that element which is most abundant transition metal in earth crust :

1 8

2 27

3 26

4 13

NCERT-XII-90

9 RBTS PAPER

162416 The correct order of ionic radii of $Ce, Pm$ and $Yb$ in +3 oxidation state is :

1

{Pm}^{3 +} < {Ce}^{3 +} < {Yb}^{3 +}

2

{Ce}^{3 +} < {Pm}^{3 +} < {Yb}^{3 +}

3

{Yb}^{3 +} < {Ce}^{3 +} < {Pm}^{3 +}

4

{Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}

Explanation:

Lanthamide contraction decreases ionic sizes from ${La}^{3 +}$ to ${Lu}^{3 +}$ . Hence the correct order will be ${Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}$ .

NCERT-XII-109

9 RBTS PAPER

162423 Melting point of transition metals is plotted in the graph given below :
Identify C, B, A in the graph respectively.

1 Cr, Tc, W

2 W, Mo, Cr

3

Mn, Cr, Tc

4

W, Tc, Cr

NCERT-XII-92

9 RBTS PAPER

162424 Which of the following statement concerning lanthanide elements is false :

1 More characteristic oxidation state of lanthanide elements is +3

2 Lanthanides are separated from one another by ion exchange method

3 lonic radii of trivalent lanthandies steadily increases with increase in the atomic number.

4 None of these

NCERT-XII-109

9 RBTS PAPER

162415 Atomic number of that element which is most abundant transition metal in earth crust :

1 8

2 27

3 26

4 13

NCERT-XII-90

9 RBTS PAPER

162416 The correct order of ionic radii of $Ce, Pm$ and $Yb$ in +3 oxidation state is :

1

{Pm}^{3 +} < {Ce}^{3 +} < {Yb}^{3 +}

2

{Ce}^{3 +} < {Pm}^{3 +} < {Yb}^{3 +}

3

{Yb}^{3 +} < {Ce}^{3 +} < {Pm}^{3 +}

4

{Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}

Explanation:

Lanthamide contraction decreases ionic sizes from ${La}^{3 +}$ to ${Lu}^{3 +}$ . Hence the correct order will be ${Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}$ .

NCERT-XII-109

9 RBTS PAPER

162423 Melting point of transition metals is plotted in the graph given below :
Identify C, B, A in the graph respectively.

1 Cr, Tc, W

2 W, Mo, Cr

3

Mn, Cr, Tc

4

W, Tc, Cr

NCERT-XII-92

9 RBTS PAPER

162424 Which of the following statement concerning lanthanide elements is false :

1 More characteristic oxidation state of lanthanide elements is +3

2 Lanthanides are separated from one another by ion exchange method

3 lonic radii of trivalent lanthandies steadily increases with increase in the atomic number.

4 None of these

NCERT-XII-109

9 RBTS PAPER

162415 Atomic number of that element which is most abundant transition metal in earth crust :

1 8

2 27

3 26

4 13

NCERT-XII-90

9 RBTS PAPER

162416 The correct order of ionic radii of $Ce, Pm$ and $Yb$ in +3 oxidation state is :

1

{Pm}^{3 +} < {Ce}^{3 +} < {Yb}^{3 +}

2

{Ce}^{3 +} < {Pm}^{3 +} < {Yb}^{3 +}

3

{Yb}^{3 +} < {Ce}^{3 +} < {Pm}^{3 +}

4

{Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}

Explanation:

Lanthamide contraction decreases ionic sizes from ${La}^{3 +}$ to ${Lu}^{3 +}$ . Hence the correct order will be ${Yb}^{3 +} < {Pm}^{3 +} < {Ce}^{3 +}$ .

NCERT-XII-109

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