Class X

The chemical formula of caustic potash is
  1. NaOH
  2. Ca(OH)2
  3. NH4OH
  4. KOH
The difference of molecules of water in gypsum and PoP is
  1. 5/2
  2. 2b
  3. 3/2
  4. ½
The function of quick lime in soda lime mixture is to
  1. Absorb moisture present in soda lime
  2. Increase the efficiency of soda lime
  3. Increase the pH of soda lime
  4. Take part in reaction with NaOH
The nature of calcium phosphate is present in tooth enamel is
  1. Basic
  2. Amphoteric
  3. Acidic
  4. Neutral
Which one of the following will turn blue litmus red?
  1. Vinegar
  2. Lime water
  3. Baking soda solution
  4. Washing soda solution
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