The number of oxygen atoms bonded to one phosphorous atom in $P_4O_6$ is

If the chord $y=mx+1$ of the circle $x^2+y^2=1$ subtends an angle of $45^{\circ}$ at the major segment of the circle,then the value of $m$ is:

Two capacitors $C_1$ and $C_2$ in a circuit are joined as shown in the figure. The potential of point $A$ is $V_1$ and that of $B$ is $V_2$. The potential of point $D$ will be

Foetal ejection reflex in human female is induced by

Which mixture forms a buffer when dissolved in $1 \, L$ of water?

Which of the following statements is not correct?