Kunal, a class 10 student studied the reaction between marble chips and dilute HCl. He took 50 g of marble chips and 100 mL of 0.1 molar HCl solution. The given graph shows how the total mass of marble chips varies with time as the reaction proceeds.
Which of the following statement are incorrect ?
I. More and more `CO_2` gas is evolved along PQ.
II. `CaCO_3` remains unreacted after point P.
III. Reaction gets completed at point P.
IV. Dilute HCl remains unreacted after point P.
