What is the gas liberated when alkaline formaldehyde solution is treated with $H_2O_2$?

The conjugate base of $HBr$ is:

The area (in sq units) bounded by the curves $y^2=4x$ and $x^2=4y$ is

The dimensional formula of $\frac{1}{2} \mu_0 H^2$ (where $\mu_0 = \text{permeability of free space}$ and $H = \text{magnetic field intensity}$) is:

Which of the following alkali metal ions has the lowest ionic mobility in an aqueous solution?

Which element is responsible for the crimson red color in fireworks?