91Ó°ÊÓ

When steam is passed over red hot iron, the substances formed are: (a) \(\mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{H}_{2}\) (b) \(\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{H}_{2}\) (c) \(\mathrm{FeO}+\mathrm{H}_{2}\) (d) \(\mathrm{FeO}+\mathrm{H}_{2}+\mathrm{O}_{2}\)

Iron is obtained on a large scale from \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) by: (a) reduction with \(\mathrm{Al}\) \(\square\) (b) calcium (c) reduction with \(\mathrm{H}_{2}\) (d) reduction with CO

\(\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}\) is called: (a) green vitriol (b) blue vitriol (c) white vitriol (d) gypsum

In the reaction, \(2 \mathrm{CuCl}_{2}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{SO}_{2} \longrightarrow A+\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{HCl} ; A\) is: (a) \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) (b) \(\mathrm{Cu}\) (c) \(\mathrm{CuSO}_{4}\) (d) CuS

\(\mathrm{FeSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\) is known as: (a) green vitriol (b) white vitriol (c) blue vitriol (d) vitriol

Acidified potassium permanganate is decolourised by: (a) white vitriol (b) bleaching powder (c) laughing gas (d) Mohr's salt

Number of unpaired electrons in \(\mathrm{Fe}^{2+}\) ion is: (a) zero (b) 2 (c) 4 (d) 5

Iodine is liberated on adding potassium iodide solution to a solution of: (a) \(\mathrm{ZnCl}_{2}\) (b) \(\mathrm{FeCl}_{3}\) (c) \(\mathrm{HgCl}_{2}\) (d) \(\mathrm{AlCl}_{3}\)

Mohr's salt is a: (a) normal sait (b) acid salt (c) basic salt (d) double salt

Blood red coloured solution is produced when ferric chloride solution is treated with: (a) \(\mathrm{KSCN}\) (b) KCN (c) \(\mathrm{K}_{4} \mathrm{Fe}(\mathrm{CN})_{6}\) (d) \(\mathrm{K}_{3} \mathrm{Fe}(\mathrm{CN})_{6}\)