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
Order of reactivity of halogen acids towards an alcohol is
HCl > HBr > HI
HBr > HI > HCl
HI > HBr > HCl
HI > HCl > HBr
C.
HI > HBr > HCl
Longer the bond length, lesser will be dissociation energy and hence, more reactivity. Among halogen acids bond length increases from HCl to HI.
Order of reactivity of halogen acids towards alcohol is
HI> HBr > HCl