From the following data; the activation energy for the reaction (cal/mol)

The reaction mechanism for the reaction P→R is as follows : the rate law for the main reaction (PR) is :

The reaction:  Is an example of-

A certain piece of copper is to be shaped into a conductor of minimum resistance. Its length and cross-sectional area should be

Let and be the areas of the triangular faces of tetrahedron and be the corresponding altitudes of the tetrahedron, then the minimum value of Given volume of the tetrahedron is 5cubic units.

volume of regular tetrahedron =
a³/6√2
volume of any tetrahedron = Ah/3

Two beakers A and B containing water and aqueous solution of sugar respectively are placed in close evacuated container as shown in the fig. What will be observed gradually with passage of time?

Match the following

Figure shows three similar lamps connected across a power supply. If the lamp fuses. The light emitted by and will change as

Three identical bulbs P, Q and R are connected to a battery as shown in the figure. When the circuit is closed

V - I graphs for two materials is shown in the figure. The graphs are drawn at two different temperatures

i-v graph for a metal at temperatures , , are as shown. The highest temperature is

At the equilibrium constant for the reaction is The numerical value in moles per litre of for this reaction at the same temperature will be

Consider the situation shown in the figure. The capacitor A has a charge q on it whereas B is uncharged. The charge appearing on the capacitor B a long 7 time after the switch is closed is:

Among the following nuclides, the highest tendency to decay by  emission is:

The direct conversion of A to B is difficult, hence it is carried out by the following shown path :
 Given where e.u. is the entropy unity then is

A radioactive isotope having a half-life of 3 day's was received after 12 days. It was found that there were 3g, of the isotope in the container. The initial weight of the isotope when packed was: