When sulfur dioxide gas is passed through lime water,which insoluble substance is formed that turns the solution milky?

$A$ solution of potassium chloride when mixed with silver nitrate solution,an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction?

Which mixture of two gases,taken in equal proportions in a gas jar,reacts in the presence of sunlight?

Write the chemical equation of the reaction with an example each in which the following changes have taken place:
$(i)$ Formation of a precipitate.

Calcium oxide reacts vigorously with water to produce:

$A$ solution of a substance $X$ is used for whitewashing.
$(i)$ Name the substance $X$ and write its formula.
$(ii)$ Write the reaction of the substance $X$ named in $(i)$ above with water.