$A$ black sulphide precipitate when treated with ozone becomes white. The white compound is:

Which pair of elements can form multiple bonds with itself and oxygen?

How is dry ice produced? Mention its uses.

An inorganic compound $(A)$ made of the two most abundant elements in the Earth's crust is used in building construction. When $(A)$ reacts with carbon,it forms a poisonous gas $(B)$,which is a very stable diatomic molecule. Identify compounds $(A)$ and $(B)$.

Which of the following halides is the most stable?

$SnCl_2$ acts as a reducing agent because: