Cold ferrous sulphate solution on absorption of NO develops brown colour due to the formation of

• paramagnetic [Fe(H₂O)₅(NO)]SO₄

• dimagnetic [Fe(H₂O)₅(NO)]SO₄

• paramagnetic [Fe(H₂O)₅(NO₃)][SO₄]₂

• diamagnetic [Fe(H₂O)₄(SO₄)]NO₃

Roasted copper pyrite on smelting with sand produces

• FeSiO₃ as fusible slag and Cu₂S as matte

• CaSiO₃ as infusible slag and Cu₂O as matte

• Ca₃(PO₄)₂ as fusible slag and Cu₂S as matte

• Fe₃(PO₄)₂ as infusible slag and Cu₂S as matte

393.

Cupric compounds are more stable than their cuprous counterparts in solid state. This is because

• the endothermic character of the 2nd IP of Cu is not so high

• size of Cu⁺ is less than Cu²⁺

• Cu²⁺ has stabler electronic configuration as compared to Cu⁺

• the lattice energy released for cupric compounds
  is much higher than Cu⁺ 

The ore chromite is

• FeCr₂O₄

• CoCr₂O₃

• CrFe₂O₄

• FeCr₂O₃

Li occupies higher position in the electrochemical series of metals as compared to Cu since

• the standard reduction potential of Li⁺/Li is lower than that of Cu²⁺ /Cu

• the standard reduction potential of Cu²⁺/Cu is lower than that of Li⁺/Li

• the standard oxidation potential of Li/Li⁺ is lower than that of Cu/Cu²⁺

• Li is smaller in size as compared to Cu

The equivalent weight of K₂Cr₂O₇ in acidic medium is expressed in terms of its molecular weight (M) as

• M/3

• M/4

• M/6

• M/7

When H₂O₂ is shaken with an acidified solution of K₂Cr₂O₇ in the presence of ether, the ethereal layer turns blue due to the formation of

• Cr₂O₃

• ${\mathrm{CrO}}_4^{2-}$

• Cr₂(SO₄)₃

• CrO₅

Anhydrous ferric chloride is prepared by

• dissoving Fe(OH)₃ in concentrated HCl

• dissolving Fe(OH)₃ in dilute HCl

• passing dry HCl over heated iron scrap

• passing dry Cl₂ gas over heated iron scrap

In dilute alkaline solution of MnO${}_4^{-}$ changes to

• MnO${}_4^{2-}$

• MnO₂

• Mn₂O₃

• MnO

Which of the following act as an oxidising agent?

• Np⁴⁺

• Sm²⁺

• Eu²⁺

• Yb²⁺