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Chemistry Revision


Question 1

Name the following:

  1. A substance which will burn in oxygen to produce an acidic oxide.
  2. Two substances that will react with each other to produce chlorine.
  3. Two acids other than sulphuric acid which can be prepared by using sulphuric acid.
  4. A normal salt and an acid salt of the same acid.
  5. The acid salt which gives sodium ions and sulphate ions in solution.
  6. A metal which occurs free in nature.
  7. An alloy of zinc used in the simple voltaic cell.
  8. The allotrope of the non-metal carbon which conducts electricity.
  9. A reagent which can be used to distinguish between ethyne and ethene.
  10. One lead compound that can be used to oxidize hydrogen chloride to chlorine.
  11. Name the gaseous inputs of the Haber’s Process.
  12. The catalyst used in Ostwald’s process.
  13. A soluble lead salt.
  14. The catalyst used in the Contact process.
  15. An alkali used in the manufacture of soaps.
  16. A gas which is neutral and behaves as an oxidizing and a reducing agent.
  17. An ammonium salt used as a component of smelling salts.
  18. A nitrate which gives off oxygen and nitrogen dioxide when heated.
  19. The product obtained at the cathode on electrolysis of sodium silver cyanide solution.
  20. A neutral gas which reacts with a non-metal to give an acidic gas.

Question 2

Give reasons for the following:

  1. Electrovalent compounds are good conductors of electricity in molten or aqueous solution state.
  2. Salts like calcium carbonate and lead carbonate cannot be electrolysed.
  3. Dil. HCL cannot be concentrated by distilling (boiling) the dilute acid.
  4. Fumes are seen evolving out when a bottle of hydrochloric acid is opened.
  5. Ammonia cannot be dried using sulphuric acid.
  6. Concentrated sulphuric acid is kept in air tight bottles.
  7. A black mark is left on a wooden plank on which concentrated sulphuric acid has accidentally fallen.
  8. A base may not be an alkali.
  9. Lead nitrate is not preferred for ring test.
  10. Ethyne is comparatively more reactive than ethene.
  11. Barium chloride solution is used to distinguish between a sodium sulphate solution and a sodium nitrate solution.
  12. Electrolysis is carried out on acidified and not on pure water.
  13. Why is bleaching by sulphur dioxide only temporary?
  14. Explain why carbon tetrachloride does not dissolve in water.
  15. Why limestone is added to the furnace in the manufacture of iron?

Question 3

What is observed when-

  1. Silver nitrate solution is added to dilute hydrochloric acid.
  2. Hydrogen chloride mixes with ammonia.
  3. Ammonia hydroxide solution is added to copper sulphate in excess.
  4. Concentrated nitric acid is added to copper.
  5. Barium chloride solution is added to dilute sulphuric acid.
  6. A solution of calcium chloride is mixed with a solution of sodium carbonate.
  7. Lead nitrate solution is added to sodium chloride solution.
  8. Ethene is bubbled through a solution of bromine in tetra chloromethane.
  9. Sodium hydroxide solution is added to zinc sulphate solution in excess.
  10. NH3 gas is bubbled through red litmus solution.
  11. Zinc oxide is heated.
  12. Sulphur dioxide is passed through lime water.

Question 4

Explain the terms:

  1. Deliquescence.
  2. Homologous series.
  3. Electron affinity.
  4. Atomic radius.
  5. Isomerism.
  6. Functional group.
  7. Alloy.
  8. Ore.
  9. Weak acid.
  10. Acid salt.

Question 5

Distinguish between:

  1. Ethane and Ethene.
  2. Electrolytes and non-electrolytes.
  3. Voltmeter and Voltameter.
  4. Oxidation and reduction.
  5. Electrovalent bond and covalent bond.
  6. Ionization potential and electron affinity.
  7. Roasting and rusting.
  8. An aqueous solution of HCl and aqueous solution of Ammonia.
  9. Basicity of acids and acidity of bases.
  10. Catenation and isomerism

Question 6.

Numericals

  1. Find the empirical formula of a substance having the following percentage composition:
    K=31.84%, Cl=28.98%, O=39.18%
  2. An organic liquid was found to possess the following percentage composition:-
    C=12.8%, H=2.1%, Br=85.1%. its molecular weight is 188. Find its molecular formula.
  3. An Organic liquid gave on analysis the following results:
    O=42.8%, N=18.5%, H=6.8% . The vapor density is 37.5. Find the empirical formula of the organic compound.
  4. Potassium Chlorate decomposes on heating to give potassium chloride and oxygen. What weight of oxygen will evolve on heation 20 gms of Potassium Chlorate.
  5. What weight of sulphuric acid and ammonia is required for the preparation of 66gms of ammonium sulphate?
  6. What is the Molarity of a solution of nitric acid if it is 71% pure and has a specific gravity of 1.43?
  7. What volume of oxygen would be needed for the complete combustion of 50 litres of ethane.
  8. Determine the percentage composition of hydrated zinc sulphate (ZnSo4.7H2O). [Zn=65, S=32, O=16]

ANS

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1. Find the empirical formula of a substance having the following percentage composition:

K=31.84%, Cl=28.98%, )=39.18%

2. An organic liquid was found to possess the following percentage composition:-

Cl=12.8%, H=2.1%, Br=85.1%. its molecular weight is 188. Find its molecular formula.

3. An Organic liquid gave on analysis the following results:

O=42.8%, N=18.5%, H=6.8% . The vapor density is 37.5. Find the empirical formula of the organic compound.

4. Potassium Chlorate decomposes on heating to give potassium chloride and oxygen. What weight of oxygen will evolve on heation 20 gms of Potassium Chlorate.

5. What weight of sulphuric acid and ammonia is required for the preparation of 66gms of ammonium sulphate.

6. What is the Molarity of a solution of nitric acid if it is 71% pure and has a specific gravity of 1.43?

7. What volume of oxygen would be needed for the complete combustion of 50 litres of etane.

8. Determine the percentage composition of hydrated zinc sulphate (ZnSo4.7H2O). [Zn=65, S=32, O=16]

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53 Responses to “Chemistry Revision”

  1. utkarsh says:

    whr r the answrs SIR???????

  2. utkarsh says:

    whr r d answrs???

  3. Neelam Ranka says:

    Please send ICSE class 7 – Chemistry,Physics and Biology notes in a paragraph form,not Q & A form AS SOON AS POSSIBLE on my Email Id .

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