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
Silicon is
semiconductor
insulator
conductor
None of these
A.
semiconductor
Semiconductors are bad conductors of electricity at room temperature but become conductor of electricity at high temperature or when some impurities are added to them.
Therefore, Si and Ge are semiconductors
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