In which of the following is the $P - O - P$ bond present?

$A$ cybrid is a hybrid carrying

Which one of the following is most acidic?

If a straight line $L$ is perpendicular to the line $4x - 2y = 1$ and forms a triangle of area $4 \text{ sq unit}$ with the coordinate axes,then the equation of the line $L$ is

The direction ratios of the two lines $AB$ and $AC$ are $1, -1, -1$ and $2, -1, 1$. The direction ratios of the normal to the plane $ABC$ are

Percentage of gold in $14$ carat gold is (in $\%$)