The total number of possible isomers of the compound $[Cu(NH_3)_4][PtCl_4]$ are:

The major product of the following reaction is

The Young's modulus of a wire is $Y$. If the energy per unit volume is $E$,then the strain will be

$A$ given mass of a gas is compressed isothermally until its pressure is doubled. It is then allowed to expand adiabatically until its original volume is restored and its pressure is then found to be $0.75$ of its initial pressure. The ratio of the specific heats of the gas is approximately :

The set of all points for which $f(x) = x^2 \cdot e^{-x}$ strictly increases is

$A$ point object on the principal axis at a distance $15\, cm$ in front of a concave mirror of radius of curvature $20\, cm$ has a velocity of $2\, mm/s$ perpendicular to the principal axis. The velocity of the image at that instant will be.......$mm/s$.