The covalent alkaline earth metal halide $(X = Cl, Br, I)$ is

From the top of a hill $h$ metres high,the angles of depression of the top and the bottom of a pillar are $\alpha$ and $\beta$ respectively. The height (in metres) of the pillar is

The biquadratic equation,two of whose roots are $1+i$ and $1-\sqrt{2}$,is

Which of the following crops were introduced into India from the New World?

If the normal to the curve $y(x) = \int_0^x (2t^2 - 15t + 10) dt$ at a point $(a, b)$ is parallel to the line $x + 3y = -5$ for $a > 1$,then the value of $|a + 6b|$ is equal to ...........

The name of the complex ion,$[Fe(CN)_6]^{3-}$ is: