Chemistry Test ...

The standard enthalpy of formation of NH₃ is –46.0 kJ mol^–1 If the enthalpy of formation of H₂ from its atoms is –436 kJ mol^–1 and that of N₂is –712 kJ mol^–1, the average bond enthalpy of N—H bond in NH₃ is 

The electrons identified by quantum numbers n and l n = 4, I = 1 , 
(2) n = 4, I = 0 , 
(3) n = 3, I = 2 , 
(4) n = 3, I = 1 , 
can be placed in order of increasing energy as

Very pure hydrogen (99.9) can be made by which of the following processes?

The species which can best serve as an initiator for the cationic polymerisation is

Aspirin is known as

Ortho-nitrophenol is less soluble in water than p and m-nitrophenols because

Which branched chain isomer of the hydrocarbon with molecular mass 72 u gives only one isomer of mono substituted alkyl halide?

For a first reaction, (A) → products the concentraion of A changes from 0.1 M to 0.025 M  in 40 min. The rate of reaction when the concentration of A is 0.01 M is