ICSE Worksheet for chapter-8 Hydrogen Chloride class 10

ICSE Worksheet for chapter-8 Hydrogen Chloride class 10

Worksheet For class 10

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Summary

1. Introduction, preparation of HCl gas by NaCl and conc.H ₂ SO ₄ (lab preparation)
2. Physical and chemical properties of HCl gas.
3. Laboratory method of preparation of HCl acid, its physical and chemical properties, tests and uses.

Section - 1

• Q1. State what you see when:
  1. A piece of moist blue litmus paper is placed in a gas jar of chlorine.
  2. Silver nitrate solution is added to dilute hydrochloric acid.
  3. Give the name of a chemical, which on being added to sodium chloride, will produce hydrogen chloride gas.
• Q2. Name one lead compound that can be used to oxidize HCl to chlorine.
• Q3. Name the gas evolved when the following mixtures are heated:
  Manganese (IV) oxide and concentrated hydrochloric acid. Write balanced equation also.
• Q4. What is the name given to the crystalline form, from which sodium chloride is obtained by mining?
• Q5. Write the equation for the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether sulphuric acid should be concentrated or dilute.

Section - 2

• Q6. How will you dry HCl gas?
• Q7. Give three tests of hydrogen chloride.
• Q8. Give reasons why :
  • Gastric juices of mammals are acidic.
  • HCl is considered a polar covalent compound.
• Q9. A colorless gas G fumes strongly in the air. The gas gives dense white fumes when a glass rod dipped in ammonia solution in held near the gas.

Answer the following questions:

• Name the gas G.
• Name two chemicals used in the preparation of the gas G.
• Write the chemical equation for the reaction of the chemicals named in(ii) when:
• The reaction mixture is not heated.
• The reaction mixture is heated above 100°C.
• Why does the gas G fume strongly in air?
• Why does the gas G form dense white fumes with ammonium hydroxide?

• Q10. In preparing hydrogen chloride by heating the mixture of sodium chloride and concentrated sulphuric acid, why does the mixture not heated above the temperature 170°C.
• Q11. Name all the products formed when conc. Hydrochloric acid is
  1. Added to a solution of silver nitrate
  2. Warmed with manganese dioxide
  3. Added to a solution of lead nitrate.
• Q12. Why cannot be hydrogen chloride e dried by using quicklime or phosphorous pentoxide?
• Q13. A greenish gas A is dissolved in water to form a solution containing two acids B and C. After allowing this solution to stand in bright sunlight, only the acid remained, and a colourless gas D was seen to bubble from the solution. Write down the names for A, B, C and D.
  • How is hydrochloric acid prepared from hydrogen chloride?
  • Name two lead compounds that can used to oxidize hydrogen chloride to chlorine (giving balanced equation)
• Q14. How can you obtain (i) chlorine from hydrochloricacid and (ii) hydrochloric acid from chlorine? Give necessary equations. How is hydrogen chloride gas collected and dried?
• Q15. Why does water in the fountain experiment run into a flask filled with hydrogen chloride gas?