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
Rayon is chemically
  1. cellulose
  2. pectin
  3. glucose
  4. amylase
In vulcanisation, natural rubber is heated with
  1. Carbon
  2. Silicon
  3. Sulphur
  4. Phosphorous
Which is/are the important raw material(s) required in cement industry?
  1. Gypsum and Clay
  2. Clay
  3. Limestone and Clay
  4. Limestone
Soap is a mixture of sodium or potassium salts of
  1. dicarboxylic acids
  2. monocarboxylic acids
  3. glycerol
  4. tricarboxylic acids
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