The cause of water pollution is due to

The process of the isolation of a metal by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is called:

Which of the following substances is known as $Oil$ $of$ $Wintergreen$?

For the given logic gate circuit, which of the following is the correct truth table?

If $A = \begin{bmatrix} 0 & 2 \\ 3 & -4 \end{bmatrix}$ and $hA = \begin{bmatrix} 0 & 3a \\ 2b & 24 \end{bmatrix}$,then the values of $h, a, b$ are respectively

The roots of the equation $x^3-3x-2=0$ are