Class VII

Which of the following is a strong acid ? 
  1. Acetic acid 
  2. Nitric acid 
  3. Lactic acid  
  4. Citric acid 
Substances which are bitter in taste , feel soapy on touching are known as 
  1. Acids 
  2. Bases 
  3. Indicators 
  4. Indicators 
Lactic acid is found in 
  1. Curd 
  2. Soap 
  3. Apple 
  4. Lime 
Which of the following colours is given by phenolphthalein in a basic salt solution . 
  1. Yellow 
  2. Pink 
  3. Orange red 
  4. Colourless 
Acids turns blue litmus to _ 
  1. Green 
  2. Yellow 
  3. Red 
  4. Black 
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