Identify the compound formed from elements $X, Y, Z$ having oxidation states $+2, +5, -2$ respectively.

If $2.4088 \times 10^{21}$ molecules are removed from $392 \, mg$ of $H_2SO_4$ in a container,the number of $H_2SO_4$ molecules remaining in the container will be ........

$K_2CS_3$ is called potassium ...... .

When a standard solution of $NaOH$ is left in air for a few hours,

$A$ photon having a wavelength of $310 \ nm$ is used to break the bond of an $A_2$ molecule with a bond energy of $288 \ kJ \ mol^{-1}$. Calculate the percentage of the photon's energy that is converted into kinetic energy $(K.E.)$. [Given: $hc = 12400 \ eV \mathring{A}$,$1 \ eV/atom = 96 \ kJ/mol$]

How is concentrated $H_2SO_4$ diluted?