What product is obtained when ethyl hydrogen sulphate is heated with an excess of alcohol at $410 \, K$?

During which phase of the cell cycle are the proteins and microtubules required for mitosis synthesized?

If the curves $x^2+p y^2=1$ and $q x^2+y^2=1$ are orthogonal to each other,then

$A$ number $n$ is chosen at random from $\{1, 2, 3, 4, \ldots, 1000\}$. The probability that $n$ is a number that leaves remainder $1$ when divided by $7$ is:

$A$ building has two overhead water tanks, each fitted with a sensor $(S_1, S_2)$ which goes to $0$ when the water level in the tank falls below a set value and remains $1$ otherwise. $A$ common pump is used to raise water from an underground storage tank to these overhead tanks. Of the following circuits, which one will turn on $(P = 1)$ the pump only when at least one of the tanks has a water level below the set value?

Amongst $LiCl$,$RbCl$,$BeCl_2$,and $MgCl_2$,the compounds with the greatest and least ionic character respectively are: