The number and type of bonds between $2$ carbon atoms in $CaC_2$ are:

Ammonia can be dried by

The maximum value of $xy$ subject to $x+y=7$ is

If $f(x) = \begin{cases} \frac{\sin(1+[x])}{[x]}, & \text{for } [x] \neq 0 \\ 0, & \text{for } [x] = 0 \end{cases}$ where $[x]$ denotes the greatest integer not exceeding $x$,then $\lim_{x \rightarrow 0^{-}} f(x)$ is equal to

What are the products formed when chlorine is passed through an aqueous hypo solution?

Consider telecommunication through optical fibres. Which of the following statements is $NOT$ true?