List of practice Questions

Which of the following does not effect half-life of first order reaction?

Half-life of a substance is 6 min. If its initial amount is 32 g, then amount present after 18 minis:

The rate constant of a reaction is $2.3\times10^{-2} mol^{-2} L^{2} min^{-1}.$ The order of reaction is

The rate constant for a first order reaction whose half-life, is $480\, s$ is:

According to transition state theory, for the formation of an activated complex, one of the vibrational degrees of freedom is converted into a translational degree of freedom. Energy of the activated complex is higher than the energy of reactant molecules.

In a chemical reaction two reactants takes part. The rate of reaction is directly proportional to the concentration of one of them and inversely proportional to the concentration of the other. The order of reaction is:

Sodium pyrophosphate is represented by which of the following formula?

Which of the following as a living fossil?

The amphibians of plant kingdom are:

Pollination of Cycas is done by

Which moss is known as peat moss ?

Nonflowering plants are called

Calyptra is derived from

Medicine for curing respiratory problems is obtained from

'Club moss' belongs to

Cycas belongs to gymnosperms due to

Funaria differs from Pteridium is absence of

The timber yielding plant Shorea robusta belongs to the family:

Which of the following statements is incorrect?

Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is:

A charge $Q$ is distributed uniformly in a sphere (solid). Then, the electric field at any point $r$, where, $r < R(r$ is the radius of sphere) varies as:

A sphere encloses an electric dipole within it. The total flux across the sphere is

A conducting sphere of radius R carrying charge +Q is connected to an uncharged conducting sphere of radius 2R. The charge that flows between them is

The angle between the dipole moment and electric field at any point on the equatorial plane is