Question 1 of 10

Both ethene and ethyne can be made in one step reactions from

Question 2 of 10

Standard enthalpy and standard entropy change for the oxidation of {tex}NH_3{/tex} at 298 K, are {tex}-382.64 kJ mol^{-1}{/tex} and {tex}-145.6 J mol^{-1}{/tex} respectively. Standard Gibbs energy change for the same reaction at 298 K is :

Question 3 of 10

The energy level diagrams for exothermic S_N1 and S_N2 reactions could be respectively (R - Reactants P - products)

Question 4 of 10

Two identical balls A and B collide head on elastically. If the velocity of A and B before collision are 0.5 m/s and -0.3m/s respectively, then their velocities after collision will be

Question 5 of 10

A weak acid HX has {tex}K_a = 1 \times 10^-5 M{/tex}. It forms a salt NaX on reaction with alkali. The percentage degree of dissociation of 0.1 M solution of NaX is

Question 6 of 10

The temperature at which 10% aqueous solution (w/V) of glucose will exhibit the osmotic pressure of 16.4 atm, is (R = 0.082 dm³ atm K^-1 mol^-1)

Question 7 of 10

On a humid day in summer, the mole fraction of gaseous H₂O (water vapour ) in the air at 25° C can be as high as 0.0287. Assuming the total pressure of 0.977 atm, what is the partial pressure of dry air ?

Question 8 of 10

∫e^{3 log x} (x⁴+1)^-1 dx is equal to

Question 9 of 10

A beaker containing a liquid appears to be half when it is actually two third full. The refractive index of liquid is

Question 10 of 10