Class VII

Special type of substance used to test whether a substance is acidic/basic are known as 
  1. Indicators 
  2. Acids 
  3. Bases 
  4. Salt 
Acids turns blue litmus to _ 
  1. Green 
  2. Yellow 
  3. Red 
  4. Black 
Sodium hydroxide is found in 
  1. Lemon 
  2. Soap 
  3. Oil of Vitriol 
  4. Table Salt 
Which of the following colours is given by phenolphthalein in a basic salt solution . 
  1. Yellow 
  2. Pink 
  3. Orange red 
  4. Colourless 
Which of the followinf is used in match industry . 
  1. Sodium chloride 
  2. Sodium bicarbonate 
  3. Sodium carbonate 
  4. Potassium chlorate 
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