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CBSE 11th Standard Chemistry Subject Hydrogen Ncert Exemplar 2 Mark Questions 2021

Published on: 27/05/2021

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Std: 11th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

Generic 2

5 x 2 = 10

Explain why HCl is a gas and HF a liquid?

Give reasons.
Ice floats on water

Give reasons.
Lakes freeze from top towards bottom

Basic principle of hydrogen economy is transporation and storage of energy in the form of liquid or gaseous hydrogen.Which property of hydrogen may be usefuk for this chemical equation if required.

Complete the following equations
\(PbS(s)+{ H }_{ 2 }{ O }_{ 2 }(aq)\)

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Answers Key:

Generic 2

5 x 2 = 10

F is a smaller and more electronegative than Cl, so it forms stronger H-bonds as compared to Cl. That's why HF is liquid and Hcl is a gas.

Density of ice is less than that of liquid water, so it floats over water.

Density of ice is less than that of liquid water. During sereve winter, the temperature of surface water keeps on decreasing and ultimately it freezes.
Thus, the ice layer at lower temperature floats over the water below it.Due to this, freezing of water into ice takes place continously from top towards bottom.

Hydrogen is a gas at room temperature. Because of it occupying large volume, it is difficult to transport it either by rail or by road. However, by cooling and applying high pressure, gaseous \({ H }_{ 2 }\) can be converted into liquid \({ H }_{ 2 }\)which has much smaller volume and hence, can be transported easily. Thus, the basic property of hydrogen which is useful for hydrogen economy is that it can be converted into a liquid by cooling under high pressure.

\(PbS(s)+{ H }_{ 2 }{ O }_{ 2 }(aq)\rightarrow PbSO_{ 4 }(s)+{ 4H }_{ 2 }O\)