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?
Give reasons:
Fluoride ion has higher hydration enthalpy than chloride ion.
The size of fluoride ion is small as compared to the chloride ion. Hence, when the two are dissolved in water, the energy of hydration released in the case of fluoride ion will be more than chloride ion due to stronger interactions (ion-dipole) between the ion and the water molecules.
Account for the following :
The lowest oxide of transition metal is basic whereas the highest oxide is
amphoteric or acidic.