The area (in square units) of the triangle formed by the lines $x=0$,$y=0$ and $3x+4y=12$ is:

What is obtained when sodium metal is heated in a stream of dry ammonia?

The radioactive sources $A$ and $B$ have half-lives of $2 \ hr$ and $4 \ hr$ respectively and initially contain the same number of radioactive atoms. At the end of $2 \ hr$,the ratio of their rates of disintegration is:

The second maturation division of the mammalian ovum occurs:

$A$ particle moves along the curve $y=x^2+2x$. The point on the curve such that the $x$ and $y$ coordinates of the particle change at the same rate is

Which process of purification is represented by the following equation :
$Ti$ (Impure) $+ 2I_2$ $\xrightarrow{250 \ ^\circ C}$ $TiI_4$ $\xrightarrow{1400 \ ^\circ C}$ $Ti$ (Pure) $+ 2I_2$