21.

Copper sulphate solution does not react with

• Zinc

• Iron

• Silver

• All of these

When 1 F of electricity is passed through acidulated water, O₂ evolved is

• 11.2 dm³

• 5.6 dm³

• 22.4 dm³

• 1.0 dm³

Standard electrode potential of cell H₂ | H⁺||Ag⁺| Ag is

• 0.8 V

• -0.8 V

• -1.2 V

• 1.2 V

Cod liver oil is

• an emulsion

• solution

• colloidal solution

• suspension

Paste is

• suspension of solid in a liquid

• mechanical dispersion of a solid in liquid

• colloidal solution of a solid in solid

• None of the above

The equation for Freundlich adsorption isotherm is

• x/m =kp^1/n

• x= mkp^1/n

• x/m= kp^-n

• All of these

The disintegration constant of radium with half-life 1600 yr is

• 2.12 × 10^-4 yr^-1

• 4.33 × 10^-4 yr^-1

• 3.26 × 10^-3 yr^-1

• 4.33 × 10^-12 yr^-1

Silicon is

• semiconductor

• insulator

• conductor

• None of these

Animal charcoal is used in decolorising colour of liquids because it is a good

• adsorbate

• adsorbent

• oxidising agent

• reducing agent

Order of reactivity of halogen acids towards an alcohol is

• HCl > HBr > HI

• HBr > HI > HCl

• HI > HBr > HCl

• HI > HCl > HBr