Question

4. If you heat a liquid, it will ultimately change into
a. a solid
b. a gas
C. either a solid or a gas depending on temperature
d. neither solid nor gas- it will always remain a qui
5. Two or more elements combine in a fixed proportion to form
a. mixture
b. compound
c. atom
d. all of these
6. Which of the following is not a mixture?
a. Air
b. Sea water
C. Pure water d. Soil
7. The valency of which of these element is zero?
a. Iron
b. Helium
c. Hydrogen
d. Oxygen
8. The formula of iron sulphide is
a. Fe2s
b. Fesz2
c. Fee3s2
d. Fes
9. Common salt is
a. calcium chloride b. sodium chloride c. zinc chloride d. magnesium chloride
10. The properties of the compound are
a. same as that of constituent elements b. different from constituent elements
c. can be same or different
d. none of these​

Answer 1

Answer:

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Explanation:

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4. b. a gas

5. b. compound

6. c. pure water

7. b. Helium

8. d. FeS

9. b. sodium chloride

10. b. different from constituent elements

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Answer 2

Answer:

peroxide and dfgcscg did it all is at exercise