combustion Reaction

Assertion (A): For a particular reaction, heat of combustion at constant pressure (q_(P)) is always greater than that at constant volume (q_(V)) . Reason (R ) : Combustion reactions are invariably accomplished by increase in number of moles.

Diborane isa potential rocket fuel that undergoes combustion according to the reaction, B_(2)H_(6)(g) +3O_(2)(g) rarr B_(2)O_(3)(g) +3H_(2)O(g) From the following data, calculate the enthalpy change for the combustion of diborane:

Explain the following with examples : (i) Tetravalency (ii) Substitution reaction (iii) Addition reaction (iv) Combustion

Select the correct alternative from the given options . Gas X to Combustible and not a supporter of combustion Gas to Combustible as well as a supporter of combustion . What could be X and Y ?