Which of the following mineral elements is responsible for the permeability of the cell membrane?

Suppose $X$ follows a binomial distribution with parameters $n$ and $p$, where $0 < p < 1$. If $\frac{P(X=r)}{P(X=n-r)}$ is independent of $n$ for every $r$, then $p$ is equal to

Epsom salt is a hydrate of which of the following?

The solution of $\frac{dy}{dx} = (\frac{x}{y})^{-1/3}$ is

$A$ block of mass $2 ~kg$ is initially at rest on a horizontal frictionless surface. $A$ horizontal force $\overrightarrow{F} = (9 - x^2) \hat{i} ~N$ acts on it,starting from $x = 0$. The maximum kinetic energy of the block between $x = 0$ and $x = 3 ~m$ in joules is:

$A$ sulphide ore is first converted into its oxide before reduction. This is done because