Class VIII

The type of glass used in making lenses and prisms is
  1. jena glass
  2. soft glass
  3. pyrex glass
  4. flint glass
Detergents used for cleaning clothes and utensils contain?
  1. bicarbonates
  2. bismuthates
  3. sulphonates
  4. nitrates
What are the soaps?
  1. Salts of silicates
  2. Mixture of glycerol and alcohols
  3. Sodium or potassium salts of heavier fatty acids
  4. Esters of heavy fatty acids
In vulcanisation, natural rubber is heated with
  1. Carbon
  2. Silicon
  3. Sulphur
  4. Phosphorous
Which of the following is used for removing air bubbles from glass during its manufacture?
  1. Arsenous oxide
  2. Potassium carbonate
  3. Soda ash
  4. Feldspar
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