Write one difference in each of the following :
Homogeneous catalysis and Heterogeneous catalysis
Following data are obtained for the reaction :
N2O5 → 2NO2 + ½O2
t/s | 0 | 300 | 600 |
[N2O5]/mol L–1 | 1.6 × 10–2 | 0.8 × 10–2 | 0.4 × 10–2 |
(a) Show that it follows first order reaction.
(b) Calculate the half-life.
(Given log 2 = 0.3010 log 4 = 0.6021)
Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth flotation process preferably?
Leaching is significant as it helps in removing impurities like SiO2, Fe2O3 etc. It is the chemical method used for the concentration of ores. Aluminum is generally extracted from bauxite ore, this ore contains SiO2, iron oxides, and titanium oxide as impurities. It is concentrated by digesting the powdered ore with a concentrated solution of NaOH at 473-523 K and 35-36 bar pressure when Al2O3 gets leached out as sodium aluminate. The impurities are left behind.
Account for the following :
The lowest oxide of transition metal is basic whereas the highest oxide is
amphoteric or acidic.