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Classification of Elements and Periodicity in Properties

Multiple Choice Questions

461.
Assertion: The correct order of oxidising power is :
${VO}_{2}^{+}$ < ${Cr}_{2} O_{7}^{2 -} < M n O_{4}^{-}$
Reason: The oxidation state of Mn is +7

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.

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

The oxidation states of the given compound are

${VO}_{2}^{+}$ : x + 2(-2) =+1

x = +5

${Cr}_{2} O_{7}^{2 -}$ : 2x + 7(-2) = -2

2x = +12

x= +6

Mn $O_{4}^{-}$ : x + 4(-2) = -1

x = -1 +8= +7

The coorect order of oxidising power is ${VO}_{2}^{+} < C r_{2} O_{7}^{2 -} < M n O_{4}^{-}$ due to the increasing stability of the lower species to which they are reduced.

462.

Which of the following element has lowest melting point?

463.

Which of the following has largest atomic radii ?

Al
Al⁺
Al²⁺
Al³⁺

464.

Ionisation potential is lowest for :

alkali metals
inert gases
halogens
alkaline earth metals

465.

Maximum number of unpaired electrons are present in

Gd³⁺
Yb²⁺
Tb²⁺
Pm³⁺

466.

Which of the following is correct?

Ionic radius is proportional to atomic number.
Ionic radius is inversely proportional to atomic mass.
Ionic radius is inversely proportional to effective nuclear charge.
All are correct.

467.

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

maximum covalency in compounds
exhibiting amphoteric nature in their oxides
forming covalent halides
forming polymeric hydrides

468.

Assertion : Helium is used in diving apparatus.

Reason : Solubility of helium is less in blood.

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.

469.

Assertion : The position of an element in periodic table after emission of one $α -$ and two $β$ - particles remains unchanged.

Reason : Emission of one $α -$ and two $β -$ particles give isotope of the element which acquires same position in periodic table

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.

470.

Mercurous chloride exists in the form of

Hg⁺
Hg₂²⁺
Hg²⁺
Hg₃²⁺