Of the following which one pollutes the air of a big city ?
A). Copper
B). Chromium
C). Lead
D). Calcium
1. Galvanization of iron is carried out using
2. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
3. What is the reaction between an acid and a base called?
4. Which of the following is not an addition polymer?
5. Black lung disease occurs in people working in
7. Tar roads get damaged if there is
8. Which one of the following is used for dating very old objects of archaeological importance?
9. Which of the following gases is present under pressure in soft drinks?