Magnesium wire is heated in the atmosphere of $CO_2$ because

Match the items given in Column $I$ with those in Column $II$ and select the correct option given below:
Column $I$ | Column $II$
$a$. $p \land q$ | $i$. $p \to q$
$b$. $p \lor q$ | $ii$. $\sim p \lor \sim q$
$c$. $\sim(p \land q)$ | $iii$. $\sim p \lor q$
$d$. $p \to q$ | $iv$. $\sim p \land \sim q$

Which of the following compounds is non-polar?

Thermite is a mixture of iron oxide and which of the following?

In the circuit shown,a potential difference of $60\,V$ is applied across $AB$. The potential difference between the points $M$ and $N$ is.....$V$

If $p$ and $q$ are distinct prime numbers and if the equation $x^2 - px + q = 0$ has positive integers as its roots,then the roots of the equation are