91Ó°ÊÓ

When copper reacts with hot and conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\), gives: (a) \(\mathrm{H}_{2}\) (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{O}_{2}\) (d) \(\mathrm{N}_{2}\)

Which silver halide is least soluble in ammonia? (a) \(\mathrm{AgF}\) (b) \(\mathrm{AgCl}\) (c) \(\mathrm{AgBr}$$\Pi\) (d) AgI

AgCl precipitate dissolves in \(\mathrm{NH}_{3}\) due to the formation of: (a) \(\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\) (b) \(\mathrm{Ag}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cl}\) (c) \(\mathrm{Ag}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{OH}\) (d) \(\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{OH}\)

Impurities of lead in silver are removed by: (a) Parkes process (b) Solvay process (c) cyanide process (d) amalgamation process

Zinc is a member of IIB or 12 th group of the periodic table. The other members of this group are: (a) boron and aluminium \(\square\) (b) cadmium and mercury \(\square\) (c) silver and gold (d) tin and lead

Calamine is the ore of: (a) \(\mathrm{Zn}\) (b) \(\mathrm{Pb}\) (c) \(\mathrm{Ca}\) (d) \(\mathrm{Hg}\)

The liquid metal at room temperature is: (a) \(\mathrm{Ca}\) (b) \(\mathrm{Zn}\) (c) \(\mathrm{Hg}\) (d) \(\mathrm{Pb}\)

Cinnabar is the ore of: (a) \(\mathrm{Zn}\) \(\square\) (b) \(\mathrm{Cd}\) (c) \(\mathrm{Hg}\) (d) \(\mathrm{Ag}\)

Chemically philosopher's wool is: (a) \(\mathrm{ZnO}\) (b) \(\mathrm{BaO}\) (c) \(\mathrm{HgCl}\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\)

The purest zinc is made by : (a) Zone refining (b) Mond's process (c) Poling process (d) Van-Arkel process