PH3 forms bubbles when passed slowly in water but NH3 dissolves. Explain why?
nitrogen is more electronegative than phosphorous (electro negativity decreases with increase in atomic size and size of phosphorous is larger than nitrogen.) Ammonia forms hydrogen bonding with water therefore it is highly soluble in water, but PH3 do not forms hydrogen bonding with water. Therefore it is not soluble in water and it escapes as a gas and forms bubbles.
NOTE: hydrogen bonding is the electrostatic force of attraction between hydrogen and electronegative atom which form covalent bond with hydrogen.