An aqueous solution of sodium carbonate is alkaline. This is because sodium carbonate is a salt of which of the following?

Two persons $A$ and $B$ are located in the $X-Y$ plane at the points $(0,0)$ and $(0,10)$ respectively. (The distances are measured in $MKS$ units). At time $t=0$,they start moving simultaneously with velocities $\overrightarrow{v}_A = 2\hat{j} \text{ m/s}$ and $\overrightarrow{v}_B = 2\hat{i} \text{ m/s}$ respectively. The time after which $A$ and $B$ are at their closest distance is

The curve satisfying the differential equation,$ydx - (x + 3y^2) dy = 0$ and passing through the point $(1, 1)$,also passes through the point

Which of the following compounds exhibits linkage isomerism?

Choose the incorrect pair for the characters given by Mendel regarding dominance and recessiveness.

The strongest acid among the following is: