
Describe the method of preparation of potassium permanganate. How does acidic potassium permanganate react with the following? Give ionic equations: (i) H$_2$S (ii) Fe (iii) iodide ion.
Write the products of the following reactions:
A first order reaction completes 20% in 10 minutes. Calculate the time taken for 75% completion.
Draw a rough sketch for the curve $y = 2 + |x + 1|$. Using integration, find the area of the region bounded by the curve $y = 2 + |x + 1|$, $x = -4$, $x = 3$, and $y = 0$.