Question

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Question1. Air is regarded as a mixture because:
a)Its pressure may very
b)Its temperature may change
c)Its volume changes under different conditions
d)Its composition may vary
Question 2 .Which of the following is a compound?
a)Stainless steel
b)Bronze
c)Graphite
d)Hydrogen sulphide
Question 3..The process used to separate oil and water is:
a)Distillation
b)Sublimation
c)Separating funnel
d)chromatography
Question 4.In which of the following the constituents are present in any ratio?
a) Mixture
b) Compound
c) Solution
d) Colloid
Question 5.A mixture of common salt, sulphur, sand and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in the dish after evaporation?
a) Sand
b) Sulphur
c) Iron filings
d) Common salt
Question 6. Two substances A and B when bought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. the substance C is:
a)A compound
b)An element
c)A mixture
d)None of the above
Question 7.Camphor can be purified by:
a)Distillation
b)Filtration
c)Sedimentation
d) Sublimation
Question 8.Which one of the following will result in the formation of a mixture?
a)Crushing of a marble tile into small particles
b)Breaking of ice cubes into small pieces
c)Adding sodium metal to water
d)Adding milk in water
Question 9.Purity of a solid substance can be checked by its:
a)Boiling point
b)Melting point
c)Solubility in water
d)Solubility in alcohol
Question 10.A mixture of ethanol and water ca be separated by:
a)Filtration
b)Decantation
c)Fractional distillation
d)Sublimation

Answer 1

Answer:

1 d

2 d

3 c

4 b

6 a

7 d

8 d

Explanation:

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