Class 7 - Chemistry Set 2
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1. Total number of elements present in one molecule of H2O. *
1 point
2. In the balanced equationCu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O *
1 point
3. Which of the following is not a mixture? *
1 point
4. Find odd one out *
1 point
5. The gas given off when a metal reacts with an acid is *
1 point
6. How many atoms are present in NH3? *
1 point
7. _______ are mixtures with non-uniform composition and have distinct boundaries of separation. *
1 point
8. In the element 15P31, the number 31 represents ? *
1 point
9. The name for the element with chemical symbol 'N' is - *
1 point
10. Oxidation is a chemical reaction that involves
 addition of ____ or removal of _____ from a
 substance. *
1 point
11. The process of cleaning the raw wool is called *
1 point
12. Conversion of CaCO3
 into CaO as per following
 reaction is an example ofCaCO3 → CaO + CO2 *
1 point
13. A lot of feeding is required at the - *
1 point
14. Which of the following substances is used as raising agent in baking industries? *
1 point
15. Which of the following compounds is an acid? *
1 point
16. Which of the following is a synthetic fibre ? *
1 point
17. Which among the following are 'coinage metals' ? *
1 point
18. Which salt is present in extinguisher in a cylinder? *
1 point
19. The scientific name of silkworm is *
1 point
20. Which of the following reaction represents the single displacement reaction ? *
1 point
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