A first order reaction has rate constant $$1 \times 10^{-2} \mathrm{~s}^{-1}$$. What time will, it take for $$20 \mathrm{~g}$$ or reactant to reduce to $$5 \mathrm{~g}$$ ?

Which of the following salt contain interstitial water molecule in it?

Which of the following is not present in baking powder?

Identify the enzyme that catalyses the reaction of $$\mathrm{CO}_2$$ with water in huma body.