Class 11th |Chemistry Viva -Voce Questions

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Q1. How is acetylene prepared in the laboratory ?

Ans. It is prepared in the laboratory by the action of water on calcium carbide.

Q2.Why is acetylene gas collected by the downward displacement of water ?

Ans. Because it is insoluble in water.

Q3. How will you convert acetylene into ethane ?

Ans. Acetylene on hydrogenation with hydrogen and nickel as catalyst will get converted to ethane.

Q4.How many bonds are present in acetylene ?

Ans. Three bonds are present in acetylene 

Q5. Is the gas saturated or unsaturated hydrocarbon ?

Ans. It is an unsaturated hydrocarbon.

Q7. Is acetylene move acidic or more basic than ethane ?

Ans. Acetylene is more acidic then ethane.

Q8. What is Lindlar's catalyst  ?Give its uses.

Ans.Lindlar's catalyst is Pd/BaSO4.It is used to convert alkynes to alkenes with the addition of H2.

Q9. Why do alkynes not show geometrical iso-merism?

Ans. Alkynes have linear structure.So, they cannot show geometrical isomerism.

Q10.Is acetylene gas saturated or unsaturated hydrocarbon ?

Ans. It is an unsaturated hydrocarbon.

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