91Ó°ÊÓ

A compound is yellow when hot and white when cold. The compound is: (a) \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{PbO}\) (c) \(\mathrm{CaO}\)\quad\( (d) \)\mathrm{ZnO}$

The hydroxide which is soluble in excess of \(\mathrm{NaOH}\) solution is: (a) \(\mathrm{Cu}(\mathrm{OH})_{2}\) (b) \(\mathrm{Fe}(\mathrm{OH})_{3}\) : (c) \(\mathrm{Cr}(\mathrm{OH})_{3}\) (d) \(\mathrm{Zn}(\mathrm{OH})_{2}\)

The colour of zinc sulphide is: (a) yellow (b) white (c) brown (d) black

The compound which is widely used as a white pigment, is: (a) \(\mathrm{PbCO}_{3}\) (b) \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{ZnO}\) (d) \(\mathrm{CaCO}_{3}\)

Corrosive sublimate is: (a) \(\mathrm{HgCl}_{2}\) (b) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{Hg}_{2} \mathrm{Cl}\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{3}\)

Calomel is the name of: (a) \(\mathrm{HgCl}_{2}\) (b) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{HgCl}_{2}+\mathrm{Hg}\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}+\mathrm{Hg}\)

Which of the following compound is used as a purgative? (a) \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) (b) \(\mathrm{CuCl}_{2}\) (c) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\) (d) \(\mathrm{HgCl}_{2}\)

In the reaction, \(\mathrm{SnCl}_{2}+\mathrm{HgCl}_{2} \longrightarrow A+\mathrm{SnCl}_{4} ; A\) is: (a) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\) (b) \(\mathrm{Hg}\) (c) \(\mathrm{HgCl}\) (d) \(\mathrm{HgCl}_{3}\)

In the reaction, \(\mathrm{HgCl}_{2}+\mathrm{KI} \longrightarrow A+\mathrm{KCl} ; A\) is: (a) \(\mathrm{HgI}_{2}\) (b) \(\mathrm{K}_{2} \mathrm{HgI}_{3}\) (c) \(\mathrm{K}_{2} \mathrm{Hgl}_{4}\) (d) \(\mathrm{KHgI}_{3}\)

Zinc carbonate is precipitated from zinc sulphate solution by the addition of: (a) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (b) \(\mathrm{CaCO}_{3}\) (c) \(\mathrm{MgCO}_{3}\) (d) \(\mathrm{NaHCO}_{3}\)