Class X

If pH value is greater than 7, then solution is
  1. acidic
  2. basic
  3. neutral
  4. salty
PH (power of Hydrogen) value of black coffee is
  1. 7
  2. 8
  3. 3
  4. 5
If concentration of H+ is greater than 1 x 10-7 then solution is
  1. neutral
  2. basic
  3. acidic
  4. aqueous
When acid reacts with metal carbonate, products are
  1. salt
  2. water
  3. carbon dioxide
  4. all of above
Phenolphthalein in acidic solution is
  1. colorless
  2. pink colored
  3. yellow colored
  4. orange colored
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