Short Answer TypeWrite 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:
Thermal stability decreases from H2O to H2Te.
The thermal stability of the hydrides of group 16 elements decreases down the group, i.e., H2O > H2S > H2Se > H2Te > H2Po. This is because M-H bond dissociation energy decreases down the group with the increase in the size of a central atom.
Account for the following :
The lowest oxide of transition metal is basic whereas the highest oxide is
amphoteric or acidic.
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