Class 7 - Chemistry Set 5
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1. The water table of a place. *
1 point
2. Treatment of wastewater involves *
1 point
3. Which of the following is a property of base ? *
1 point
4. The scientific name of silkworm is *
1 point
5. Aqua-regia is the mixture of *
1 point
6. Atomic number of sodium is 11 and mass number is 23. What will be the number of electrons and neutrons in sodium atom respectively? *
1 point
7. Which of the following element is used in dry cell as well as galvanisation ? *
1 point
8. The nature of common salt solution is *
1 point
9. The pupa inside the cocoons are put in boiling water. This is done to *
1 point
10. Which of the following is necessary for rusting of iron ? *
1 point
11. When natural gas react with oxygen then which of the following gas will be evolved ? *
1 point
12. Which of the following structure is related to sulphur molecule? *
1 point
13. A water molecule can be split up by : *
1 point
14. Hardness of water is caused due to presence of ________ and Magnesium ions. *
1 point
15. Bordeax is mixture of *
1 point
16. Which among the following acids is present in lemon? *
1 point
17. The last step in waste water treatment is_________process. *
1 point
18. Identify the set of pure and impure water among the following. *
1 point
19. The nature of common salt solution is *
1 point
20. Which one of the following types of medicine is used for treating acidity in stomach? *
1 point
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