Question

Question 1. 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 funel
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 13.A mixture of ZnCl2 and PbCl2 can be separated by:
a)Distillation
b)Crystallization
c)Sublimation
d)Adding acetic acid

Question 14.A mixture of methyl alcohol and acetoe can be separated by:
a)Distillation
b)Fractional distillation
c)Steam distillation
d)Distillation under reduced pressure

Question 15.Mixture of sand and sulphur may best be separated by:
a)Fractional crystallization from aqueous solution
b)Magnetic method
c)Fractional distillation
d)Dissolving in CS2 and filtering

Question 16.Which component of the mixture ( Fe + S ) reacts with dil. HCI and gives hydrogen gas?
a)Sulphur
b)Iron
c)Both
d)None

Question 17.Which of the following is considered to be a pure substance?
a)Granite
b)Sodium chloride
c)Muddy water
d)Milk of magnesia

Question 18.Physical properties of a mixture:
a)Vary with the amount of substance
b)Depend on the volume of the substance
c)Depend on the organization of the substance
d)Vary depending upon its components
Question 19.Compounds:
a)Are the same as mixtures?
b)Can be separated by their physical properties
c)Contain only type of element
d)Are different kinds of atoms chemically combined with each other?

Question 20.White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
a)They are homogeneous mixtures and be classified as metallic alloys.
b)The materials are heterogeneous mixtures and can be classified by their components.
c)The samples have variable compositions and are classified as metallic solutions.
d)The samples are heterogeneous mixtures that can be separated using magnetic properties.​

Answer 1

Answer:

Q1 (D)

Q2(A)

Q3(C)

Q4(A)

Q5(A)

Q6(A)

Q7(D)

Q8(D)

Q9(B)

Answer 2

Answer:

hi here is your answer

Explanation:

Q1. (C)

Q2. (D)

Q3. (C)

Q4. (B)

Q5. ( Iron fillings and salt)

Q6. (C)

Q7. (d)

Q8. (c)

Q9 . (B)

Q13. (A)

Q14. (B)

Q15. (A)

Q16. (C)

Q17. (d)

Q18. (D)