When $FeCl_3$ reacts with $K_4[Fe(CN)_6]$,which of the following compounds is formed?

The layer of the uterus which becomes much eroded due to placental villi is known as

The electric potential $V$ at any point $(x, y, z)$ (all in $m$) in space is given by $V = 4x^2 \, V$. The electric field at the point $(1 \, m, 0, 2 \, m)$ in $V/m$ is:

Which of the following is an electrophile?

Which of the following acts as an antagonist to gibberellic acid?

$A$ source of sound is travelling with a velocity of $40\, km/h$ towards an observer and emits sound of frequency $2000\, Hz$. If the velocity of sound is $1220\, km/h$,what is the apparent frequency heard by the observer in $Hz$?