Question

When hydrogen sulphide gas is passed through a blue solution of copper sulphate,the colour of the solution fades and a black precipitate is obtained.
a Name the type of reaction mentioned above.
b Why does the colour of the solution fade away
c Write the chemical name of the black precipitate formed
d Give the balanced chemical equation for the reaction involved.​

Answer 1

Answer:

Chemical Reaction

Displacement reaction

Speed

Velocity

The colour of changing in the solution of black

Hg–Mercury

H–Hydrogen

C– Carbon

O– Oxygen

Mg+ O2= Mgo

Na+ Cl= Nacl

Na+ Oh= NaOh

Mg+ O2× Na+ cl= Nacl

Answer 2

Answer:

a) double displacement reaction b)Because the cu2+ ions present in the solution is precipitated as cus so the colour fades away c) cus - copper sulfide d) cuso4+h2s gives cus + h2so4