$Ca{C}_2$ and $H_{2}O$ react to produce:

Q. From the following reaction sequence, calculate the mass of polythene which can be produced by $10$ kg of $Ca{C}_2$.
$Ca{C}_2+H_{2}O\to CaO+C_2{H}_2$
$C_2{H}_2\to C_2{H}_4$
$n{C}_2{H}_4\to {\left(C_2{H}_4\right)}_n$ (as nearest integer)

Q. $K_p$ values for, $C_2{H}_4+H_2\rightleftharpoons C_2{H}_6$, is $5\times {10}^{18}{atm}^{-1}$ and $K_p$ for, $C_2{H}_2+H_2\rightleftharpoons C_2{H}_4$, is $5\times {10}^{26}{atm}^{-1}$ at $50$. If $K_p$ for :
$2H_2+C_2{H}_2\rightleftharpoons C_2{H}_6$ is $x\times {10}^{45}$, then $10x$ is__________.

Q. An ideal gaseous mixture of ethane $\left(C_2{H}_6\right)$ and ethene $\left(C_2{H}_4\right)$ occupies $28$ litre at $1atm$ and $0^{o}C$. The mixture reacts completely with $128gm$ $O_2$ to produce ${CO}_2$ and $H_{2}O$. Mole fraction at $C_2{H}_4$ in the mixture is :

Q. Polyethylene is obtained from calcium carbide.
$Ca{C}_2+2H_{2}O⟶Ca{\left(OH\right)}_2+C_2{H}_2$
$C_2{H}_2+H_2⟶C_2{H}_4$
$n{C}_2{H}_4⟶(-C{H}_2-C{H}_2-{)}_n$
Therefore, the amount of polyethylene obtained for 64 kg $Ca{C}_2$ is:

Q. Heats of combustion of ${CH}_4,C_2{H}_6,C_2{H}_4$ and $C_2{H}_2$ is $-212.8,-373.0,-337.0$ and $-310.5$ $kcal$ respectively at the same temperature. The best fuel among these gases is: