A mixture of benzene vapour and air is passed over `V_2O_5` catalyst heated at `450^@C`.

A mixture of benzene & fuming H_2SO_4 is heated at 200-250^@C .

Oxidation of benzene with air (at775k )in the presence of V_2O_5 as catalyst gives

Why does V_(2)O_(5) act as a catalyst ?

Write, with balanced chemical equation, what happens when nitrogen gas is passed over calcium carbide heated at 1100^@C .

Which of the following statements about the composition of the vapour over an ideal 1:1 molar mixture of benzene and toluene is correct ? Assume that that the temperature is constant at 25^@C . (Given, Vapour pressure Data at 25^@C , benzene = 12.8 KPa, toluene = 3.85 KPa)

25 mL of a mixture containing nitrogenn and nitric oxide is passed over heated copper. The volume of gaseous mixture becomes 20 mL. what is the percentage composition of the original mixture. [all volumes are measrued at the same temperature].