One gas bleaches the colour of flowers by reduction,while the other by oxidation,the two gases respectively are

$A$ hollow sphere and a solid sphere having the same mass and same radius are rolled down a rough inclined plane. Which of the following statements is correct?

In polymeric $(BeCl_2)_n$,there are

The equations of the normals at the ends of the latus rectum of the parabola $y^2 = 4ax$ are given by

$A$ ray of light along $x+\sqrt{3}y=\sqrt{3}$ gets reflected upon reaching the $x$-axis. The equation of the reflected ray is:

The difference between the fundamental frequencies of an open pipe and a closed pipe of the same length is $100 \ Hz$. The difference between the frequencies of the second harmonic of the open pipe and the third harmonic of the closed pipe is: (in $Hz$)