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CTET Prep: Science Questions - Chemistry - Nature and Composition of Substances
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Any substance which has a clear and specific chemical composition and structure is known as a chemical. Chemicals exist in a range of states i.e. they can be either solid or liquid. They can change their state influenced by certain factors like pressure, temperature etc.

CTET Prep: Science Questions - Chemistry - Nature and Composition of Substances
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25 Questions

1. The substances that are composed of two or more different elements in fixed proportion by mass are called
2. Which one of the following laws directly explains the law of conservation of mass?
3. ‘Misch metal’ is widely used in manufacture of which of the following?
4. Sodium carbonate crystals lose water molecules. This property is called
5. Which of the following is an element?
6. Which one of the following is not a mixture?
7. The total number of electrons present in 18mL of water (density of water is 1g/mL)
8. A gas is found to have the formula (CO)n. Its vapour density is 70. The value of must be
9. A pure substance can only be
10. Diamond is
11. Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen?
12. An alloy is
13. The credit for the discovery of transuranic element goes to
14. Consider the following elements:
1. Copper 2. Gold
3. Platinum 4. Silver Which of the above elements exists free in nature?
15. In known elements, the maximum number is of
16. What is the number of P atoms in one mole of P4?
17. The father of modern chemistry is
18. The mass of one atom of hydrogen is approximately
19. Antimony is
20. The law of constant proportions was enunciated by
21. Which one of the following is not an element?
22. Which one is the compound in the following?
23. Consider the following statements: Equivalent weight of the compound is the weight of it that combines with or displaces directly
1. 1.008 part by weight of hydrogen.
2. 16 parts by weight of nitrogen.
3. 35.45 part by weight of chlorine. Which of the statements given above are correct?
24. Which one among the following is the heaviest?
25. Oxygen and ozone are

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