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The d-And-f-Block Elements

Multiple Choice Questions

671.

Essential component of amalgam is :

672.

The compound used in enrichment ofuranium for nuclear power plant is

U₃O₈
UF₆
UO₂(NO₃)₂
UCl₄

673.

What is the name of element with atomic number 105 ?

Kurchatovium
Dubnium
Nobelium
Holmium

674.

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

675.

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.

676.

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.

677.
Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk driver.
Reason : Change in colour is due to the complexation of alcohol with potassium di chromate.

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 assertion is true, but reason is false.

Change in colour is clue to the oxidation or alcohol with potassium clichromate. Oxidation of alcohols with K₂Cr₂O₇ in dilute H₂SO₇ (orange solution):

K₂Cr₂O₇ in presence of dilute H₂SO₄ acts as an oxidising agent. It is converted into chromic sulphate which is green in colour.

$\underset{(orange)}{K_{2} {Cr}_{2} O_{7}} + 4 H_{2} {SO}_{4} \to K_{2} {SO}_{4} + \underset{(green)}{{Cr}_{2} ({SO}_{4})_{4}} + 4 H_{2} O + 3 O$

678.

Assertion : SiF₆^2- is known but SiCl₆^2- is not.

Reason : Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of Si strongly.

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.

679.

Transition metals are related to which block ?

's' block
'p' block
'd' block
none of these

680.

The general electronic configuration of transition elements, is :

(n-1)d^1-5 ns⁰
(n-1)d^1-10 ns¹
(n-1)d^1-10 ns²
(n-1)d^1-10 ns^1-2