Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 3

MEDIUM

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IMPORTANT

Earn 100

Why the third period of Modern periodic table contains $8$ elements and not $18 ?$

Important Questions on Classification of Elements and Periodicity in Properties

MEDIUM

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 4

Tell the relation between effective nuclear charge

(Z_{eff})

, atomic number

(Z)

, and shielding constant

(σ) .

Explain it qualitatively.

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 5

Which orbital electrons are known to shield the nuclear charge improperly? Does this generate some irregularity in the properties of elements?

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 6

{Pb}^{4 +}

compounds are very good oxidising agents. Explain?

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 7

Arrange the following in correct order of stability:

(i) ${Ga}^{+}, \ln^{+}, {Tl}^{+}$

(ii) ${As}^{+ 5}, {Sb}^{+ 5}, {Bi}^{+ 5}$

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 8

Explain why cations are smaller and anions larger in radii than their parent atoms.

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 9

In the ionic compound

KF,

the

K^{+}

and

F^{-}

ions are found to have practically identical radii, about

1.34 A °

each. What can you predict about the relative atomic radii of

K & F ?

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 10

Why second ionization enthalpy is always higher than the first ionisation enthalpy for every element?

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 11

The first ionization enthalpy of carbon is greater than that of boron, whereas the reverse is true for second ionization enthalpy. Explain.