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
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 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
Animal charcoal is used in decolorising colour of liquids because it is a good
adsorbate
adsorbent
oxidising agent
reducing agent
A.
adsorbate
Adsorbate adsorbs impurities from surface of substance.
Animal charcoal is good adsorbate. The impurities adsorb on its surface and thus it decolourises colour of liquid.
Order of reactivity of halogen acids towards an alcohol is
HCl > HBr > HI
HBr > HI > HCl
HI > HBr > HCl
HI > HCl > HBr