The overall reaction taking place at anode during electrolysis of fused sodium chloride using suitable electrode is

• oxidation of chloride

• reduction of sodium ions

• reduction of chlorine

• oxidation of sodium atoms

The only radioactive element among the lanthanoids is

• gadolinium

• holmium

• promethium

• neodymium

What is the basicity of orthophosphorous acid?

• One

• Two

• Three

• Four

Which of the following compounds has highest boiling point?

• Propan-1-ol

• n-butane

• Chloroethane

• Propanal

Which oxoacid of sulphur contains S-S bond in its structure?

• Disulphurous acid

• Disulphuric acid

• Perdisulphuric acid

• Hydrosulphurous acid

Which among the following alloys is used in making instruments for electrical measurements?

• Stainless steel

• Manganin

• Spiegeleisen

• Duralumin

27.

Which among the following solutions is not used in determination of the cell constant?

• 10^-2 M KCl

• 10^-1 M KCl

• 1 M KCl

• Saturated KCl

Which halogen forms an oxyacid that contains the halogen atom in tripositive oxidation state? 

• Fluorine

• Chlorine

• Bromine

• Iodine

Name the metal that is purified by placing the impure metal on sloping hearth of a reverberatory furnace and heating that above its melting point in the absence of air.

• Mercury

• Gallium

• Zirconium

• Copper

Identify a 'chemical twin' among the following.

• Zr-Ta

• Nb-Tc

• Hf-Re

• Nb-Ta