Class VIII

In vulcanisation, natural rubber is heated with
  1. Carbon
  2. Silicon
  3. Sulphur
  4. Phosphorous
Which one of the following is the petroleum wax?
  1. Paraffin wax
  2. Jonoba wax
  3. Carnauba wax
  4. Bees wax
Which of the following is a protein?
  1. Natural rubber
  2. Starch
  3. Cellulose
  4. None of these
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
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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