GIVE REASONS - HYDROCHLORIC ACID - HCl - ICSE

ICSE - GIVE REASONS - HYDROCHLORIC ACID - HCl

• GIVE REASONS

1. 1.     HCl gas is not collected over water.
   2.     In the laboratory preparation of HCl, temperature is maintained below 200⁰C.
   3.     HCl gas exposed to Ammonia gives white dense fumes.
   4.     Conc. HNO₃ is not used instead of Conc. Sulphuric acid in the preparation of HCl gas.
   5.     Hydrochloric acid is not prepared by dissolving HCl gas directly in water.
   6.     HCl gas cannot be dried using quick lime.
   7.     HCl in water conducts electricity but in Toluene does not.
   8.     HCl gas fumes in moist air but H₂S does not.
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Class 10 ICSE CHEMISTRY questions on HYDROGEN CHLORIDE - 3

Give reasons

1.      HCl gas fumes in moist air but H₂S does not.

2.      HCl gas is not collected over water.

3.      HCl gas cannot be dried using quick lime.

4.      In the laboratory preparation of HCl, temperature is maintained below 200⁰C.

5.      HCl gas exposed to Ammonia gives white dense fumes.

6.      Conc. HNO₃ is not used instead of Conc. Sulphuric acid in the preparation of HCl gas.

7.      Hydrochloric acid is not prepared by dissolving HCl gas directly in water.

8.      HCl in water conducts electricity but in Toluene does not.

Important reactions from Chapter-7 Study of compounds

Important reactions from Chapter-7 Study of compounds

Write the products and balance the equations when the following are taken as reactants:

1.      NaCl + H₂SO₄ --> 

2.      Fe + 2HCl 

3.      HCl + NH₃

4. Zn + dil.HCl

5.      dil. 2HCl + Na₂S₂O₃ 

6.      dil.HCl + AgNO₃  

7.      dil. 2HCl + Pb(NO₃)₂ 

8.      dil.2HCl + Na₂CO₃ 

9.      MnO₂ + 4HCl 

10.  PbO₂ + 4HCl 

1.      NH₄Cl          +          Ca(OH)₂  

2.         AlN +   H₂O 

3.         Mg₃N₂ +     H₂O 

4.         N₂ +    H₂ à

5.        NH₃ + O₂  

6.        NH₃ +PbO  

7.      NH₃ + CuO  

8.      NH₃ (excess)+ Cl₂ 

9.      NH₃ + Cl₂excess

10.  NH₄Cl + NaNO₂  

11.  NH₄NO₂ 

12.  KNO₃ + Conc. H₂SO₄  

13.  NH₃ + O₂     in presence of Platinum

14.  NO₂ + 2H₂O + O₂  

15.  Thermal decomposition of Conc.HNO₃ 

16.  Hot Conc. HNO₃ + C  

17.  Hot Conc. HNO₃ + S  

18.  Hot Conc. HNO₃ + Cu  

19.  Cold dil. HNO₃ + Cu 

20.  Glucose C₆H₁₂O₆ + Conc.H₂SO₄

21.  CuSO₄.5H₂O + Conc.H₂SO₄

22.  BaCl₂ + dil. H₂SO₄ 

23.  Cu + Conc. 2H₂SO₄  

24.  Pb(NO₃)₂ + H₂SO₄ 

25.  Cu + 2H₂SO₄ 

26.  C + 2H₂SO₄ 

27.  S + 2H₂SO₄ 

28.  dil. H₂SO₄+ CuS 

29.  SO₂ + O₂ 

30.     SO₃ + H₂SO₄ 

31.     H₂S₂O₇ + H₂O  

32.  4FeS₂ + 11O₂ 

ICSE CHEMISTRY CLASS 10 HCl- observations

OBSERVATIONS - HYDROGEN CHLORIDE (HCl)

a)      State your observations when dil. HCl is added to:

1.      A metal Carbonte : 

ANS: Brisk effervescence of a colourless gas. The gas turns lime water milky but has no effect on acidified Potassium permanganate or Potassium dichromate.

2.       A metal sulphite

ANS: A suffocating gas clolourless gas is produced. This gas turns lime water milky. This gas turns acidified Potassium dichromate to clear green solution and decolourizes acidified Potassium permanganate

3.       A metal sulphide:

ANS: A colourless gas with rotten egg smell is evolved. This gas turns moist Lead acetate paper to silvery black.

4.       Silver nitrate solution:

ANS: A white precipitate is formed. This precipitate is soluble in excess Ammonium hydroxide.

5.       Lead nitrate solution:

ANS: A white precipitate is formed. This precipitate disappears on heating.

b)      State your observations when Conc. HCl is added to :

1.       MnO₂ :Ans: A gas with greenish yellow colour is evolved.

2.       KMnO₄ :Ans: A gas with greenish yellow colour is evolved

c)       State your observation when Hydrogen chloride gas is mixed with Ammonia gas.

ANS: It gives dense white fumes when HCl gas is mixed with Ammonia gas.

d)      In the fountain experiment using HCl gas.

ANS: The litmus solutions rises in the jet tube and when it ejects out of the jet tube, it turns to litmus solution.

e) State your observation when the glass rod is exposed to the gas released when Conc. Sulphuric acid is heated with NaCl.

ANS: A colourless gas with pungent odour is released. When a glass rod dipped in Ammonium hydroxide is exposed to that gas it produces dense white fumes. 

       State your observations when:

1.      Excess Ammonium hydroxide is added to the precipitate obtained by adding dil. HCl to AgNO₃ solution.

2.      When dil. HCl is added to Na₂S.

3.      Conc. HCl is heated with MnO₂.

4.      Dil. HCl is added to Magnesium ribbon.

5.      Dil. HCl is added to AgNO₃ solution.

6.      Sodium chloride is heated with Conc. Sulphuric acid.

7.      In the fountain experiment using HCl gas.

8.      A glass rod dipped in NH₄OH is brought near the open end of a gas jar containing HCl gas.

9.      A few drops of dil. HCl is added to AgNO₃ solution followed by addition of NH₄OH.

10.  Dil. HCl added to Sodium carbonate crystals.

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