4. d and f- block elements - CBSE STD 12 Science Chemistry Questions

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01

M.C.Q (1 Marks)

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Sample Questions

4. d and f- block elements questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

The $\mathrm{E}^{\circ}$ value for the $\mathrm{Mn}^{3 *} / \mathrm{Mn}^{2+}$ couple is more positive than that of $\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$ or $\mathrm{Fe}^{3+} / \mathrm{Fe}^{2 *}$ due to change of

A
$d^5$ to $d^2$ configuration
✓
$d^4$ to $d^5$ configuration
C
$d^3$ to $d^5$ configuration
D
$d^5$ to $d^4$ configuration

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark

'Spin only' magnetic moment is same for which of the following ions?

$A$. $\mathrm{Ti}^{3+}$ $B$. $\mathrm{Cr}^{2+}$ $C$. $\mathrm{Mn}^{2+}$ $D$.$\mathrm{Fe}^{2+}$ $E$. $\mathrm{Sc}^{3+}$

Choose the most appropriate answer from the options given below.

A
$A$ and $E$ only
B
$B$ and $C$ only
C
$A$ and $D$ only
✓
$B$ and $D$ only

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark

The pair of lanthanoid ions which are diamagnetic is

A
$\mathrm{Ce}^{3+}$ and $\mathrm{Eu}^{2+}$
B
$\mathrm{Gd}^{3+}$ and $\mathrm{Eu}^{3+}$
C
$\mathrm{Pm}^{3+}$ and $\mathrm{Sm}^{3+}$
✓
$\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark

Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to $\mathrm{VI}$.

$A$. $Al^{3+}$ $B$. $Cu^{2+}$ $C$. $Ba^{2+}$ $D$. $Co^{2+}$ $E$. $Mg^{2+}$

Choose the correct answer from the options given below.

A
$B, C, A, D, E$
B
$E, C, D, B, A$
C
$E, A, B, C, D$
✓
$B, A, D, C, E$

Answer: D.

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Q 5M.C.Q (1 Marks)1 Mark

The stability of $Cu ^{2+}$ is more than $Cu ^{+}$salts in aqueous solution due to -

A
second ionisation enthalpy.
B
first ionisation enthalpy.
C
enthalpy of atomization.
✓
hydration energy.

Answer: D.

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