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The d-And-f-Block Elements

Multiple Choice Questions

301.

CuSO₄ does not react with :

302.

Assertion : Magnetic moment of Dy is the highest among the lanthanoids.

Reason : Orbital motion contributes magnetic moment.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

303.

Reason of passively of iron is :

Fe₂O₃
Fe₃O₄
FeO
Fe₂O₄ ^. 3H₂O

304.

Fuel used in nuclear reactor is :

plutonium
thorium
radium
deuterium

305.

Essential component of amalgam is :

306.

The compound used in enrichment ofuranium for nuclear power plant is

U₃O₈
UF₆
UO₂(NO₃)₂
UCl₄

307.

What is the name of element with atomic number 105 ?

Kurchatovium
Dubnium
Nobelium
Holmium

308.

What is the general outer electronic configuration of the coinage metals ?

ns² np⁶
(n-1)d¹⁰ ns¹
(n-1)d¹⁰ ns²
(n-1)d⁹ ns²

309.
Assertion : $E^{°}$ for Mn³⁺/Mn²⁺ is more positive than Cr³⁺/Cr³⁺
Reason : The third ionization energy of Mn is larger than that of Cr.

If both assertion and reason are true and reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true, but reason is false.

Both assertion and reason are false statements.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

It is known that the value of $E^{°}$ becomes more negative clown the series. As the chromium is present below in electrochemical series than Mn, so Mn has more positive $E^{°}$ value than Cr.
Mn $\to$ 3d⁵ 4s², Mn $\to$ 3d⁵4 $s^{0}$
Cr $\to$ 3d⁵4s¹ Cr $\to$ 3d⁴4 $s^{0}$
For elimination or one electron from Mn²⁺, more energy is required due to its stable configuration. That is why third ionization energy of Mn is larger than Cr.

310.

Assertion : K₂Cr₂O₇ is used as primary standard in volumetric analysis.

Reason : It has a good solubility in water.

If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.