1. Which one of the following elements forms the maximum number of compounds?
2. What is the eye irritating compound when cutting onions?
3. Only those metals can displace hydrogen from water, which are . . . . . . . . in the electrochemical series of metals?
4. . . . . . . . . is the main component of cement.
5. The chemical formula of ammonium sulphate is . . . . . . . .
6. Name the group of modern periodic table in which all elements are gases?
7. Which gas is used in aerated water?
8. One of the reasons for the formation of strong bonds by carbon is its . . . . . . . . shape.
9. If any of the following non-metals are placed in the air, then it ignites?
10. Which of the following gases is not inert gas?
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