Which one of the following pairs of food components in humans reaches the stomach totally undigested?

Which gas is evolved when $SiO_2$ reacts with sodium carbonate?

If the straight lines $2x + 3y - 1 = 0$,$x + 2y - 1 = 0$ and $ax + by - 1 = 0$ form a triangle with the orthocentre at the origin,then $(a, b) =$

Which of the following is a biodegradable pollutant?

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 compound$(s)$ has '$Z$' configuration?