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

EASY

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IMPORTANT

Earn 100

${Pb}^{4 +}$ compounds are very good oxidising agents. Explain?

Important Questions on Classification of Elements and Periodicity in Properties

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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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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.

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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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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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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.

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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 12

Among the elements

B, Al, C

and

Si

.

(i) Which element has the highest first ionisation enthalpy?

(ii) Which element has the most metallic character?

Justify your answer in each case.

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

Be

and

Ne

have positive values of electron gain enthalpy against the general trend in their period in modern periodic table. Explain.

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 14

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However, oxygen has lower ionisation enthalpy than nitrogen. Explain.