Acids give colourless solution with phenol-phthalein?

Blue solution of CuSO_4 on treatment with excess KCN give colourless solution due to the

0-2 per cent solution of phenol is :

Bubbles of colourless soap solution appear coloured in sunlight.Why?

Sapna added a strip of Al to 50 mL of a solution of FeSO_4 in a test tube. The correct observation for change in colour of solution by her is. Pale green coloured solution turned blue or Colourless solution turned pale green or Pale green coloured solution remained pale green or Colourless solution turned blue

Roasting of sulphides gives the gas X as a by-product.This is a colourless gas with choking damage to the respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas 'X' is

Acids turn………..litmus solution to……………

How will you convert phenol into phenolphthalein, picric acid and salol.

Benzene diazonium chloride on reaction with phenol in basic medium gives:

A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after some time. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is (are)