Which from following is the slope of the graph of rate versus concentration of the reactant for first order reaction?

What is the packing efficiency of silver metal in its unit cell?

Which from following polymers is obtained from $$\mathrm{C}_2 \mathrm{~F}_4$$ ?

Calculate current in ampere required to deposit $$4.8 \mathrm{~g} ~\mathrm{Cu}$$ from it's salt solution in 30 minutes. [Molar mass of $$\mathrm{Cu}=63.5 \mathrm{~g} \mathrm{~mol}^{-1}$$ ]