Calculate the molar mass of an element having density $$21 \mathrm{~g} \mathrm{~cm}^{-3}$$ that forms fcc unit cell $$\left[\mathrm{a}^3 \cdot \mathrm{N}_{\mathrm{A}}=36 \mathrm{~cm}^3 \mathrm{~mol}^{-1}\right]$$

Which of the following is the SI unit of coefficient of viscosity?

Which from following metal has ccp crystal structure?

Identify the reagent '$$A$$' used in the following conversion.

Ethyl bromide $$\stackrel{\mathrm{A}}{\longrightarrow}$$ Ethylpropanoate