1. Chalcopyrite is the most important ____ ore
2. Which of the following metal is found in free form in nature?
Silver, Gold, Copper, Tin
3. When iron rusts its weight ____
4. Metal is extracted from Sulphide ores by:
5. Scheelite is the ore of:
6. Which metal has the least resistance?
7. The impurities contained in ore is known as :
8. The most abundant gas in the atmosphere of Mars:
9. Which gas is used for welding?
10. Nitrating mixture contains Sulphuric acid and ____
11. Pitchblende is the ore of:
12. The gas used in Cigarette lighters:
13. The pH value of Blood:
14. The acid that cannot be kept in glass bottles:
15. The year of Chernobyl disaster?
16. The chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period is termed:
17. Nuclear winter will ____ earth's temperature:
18. The gas emitted by plants during day time:
19. The cheapest industrial acid:
20. The first to extract kerozene from petroleum:
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