Question

name the followings : (a.) A complex salt solution used for testing a basic gas lighter than air . (b) a base which reacts with HCl to give a salt which on hydrolysis gives a slightly acidic solution .

Answer 1

a) Hydrogen peroxide

b) NaOH (sodium hydroxide)

Answer 2

Hey dear,

● Answer -
A) Potassium tetraiodomercurate (II)
B) Ammonium hydroxide

● Explanation -
A) Potassium tetraiodomercurate (II) -
- aka Nessler's reagent
- It is used to detect ammonia (basic gas lighter than air).

B) Ammonium hydroxide -
- NH4OH (weak base) reacts with HCl (strong acid) to give salt NH4Cl.
NH4OH + HCl --> NH4Cl + H2O
- NH4Cl (salt of strong acid & weak base) on hydrolysis gives slightly acidic soln.

Hope this helped you...