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.H2SO4(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?

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