A compound is yellow when hot and white when cold. The compound is:

An inorganic salt is strongly heated. The residue is yellow when hot and white when cold. The salt contains:

An inorganic salt is strongly heated. The residue is yellow when hot and white when cold. The salt contains:

Name: An oxide which is yellow when hot and white when cold.

A white solid Y, on heating gives off a gas which turns lime water milky, the residue is yellow when hot, white when cold. The solid Y is probably:

A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of NH_(4)OH and on passing H_(2)S . Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (E) are identified as:

The following substance will be yellow when hot and white when cold