Which one of the following is an example of cleistogamy?

Heating an aqueous solution of aluminium chloride to dryness will give:

Thermite is a mixture of

The volume-temperature graphs of a given mass of an ideal gas at constant pressures are shown below. What is the correct order of pressures?

Two waves $Y_{1} = 0.25 \sin(316 t)$ and $Y_{2} = 0.25 \sin(310 t)$ are propagating along the same direction. The number of beats produced per second is:

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is