Some reactions of $NO _2$ relevant to photochemical smog formation are
Identify $A , B , X$ and $Y$
A wooden block of mass M lies on a rough floor. Another wooden block of the same mass is hanging from the point O through strings as shown in the figure. To achieve equilibrium, the coefficient of static friction between the block on the floor and the floor itself is
There is a number of factors that contribute to the pollution of the environment. Some of the major causes of atmospheric pollution are given below -