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Pure substance and mixture - class-VI

pure substance and mixture

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Questions

Question 1 Multiple Choice (Single Answer)

In which of the following compounds resonance does not occur
(i) ${H _2}O$
(ii) $Si{O _2}$
(iii) $S{O _3}$
(iv) $C{O _2}$

  1. Both (i) and (iv)
  2. Both (i) and (ii)
  3. Both(iii) and (iv)
  4. (i),(ii)and(iv)
Question 2 Multiple Choice (Single Answer)

Which of the following is/are example(s) of mixtures?

  1. Air
  2. $Fe + S$
  3. Bronze
  4. All of the above
Question 3 Multiple Choice (Single Answer)

A compound is always ______ whereas a mixture is :

  1. Heterogenous, both heterogenous and homogenous
  2. Homogenous, heterogenous
  3. Homogenous, Both homogenous and heterogenous
  4. None of above
Question 4 Multiple Choice (Single Answer)

Which of the following is a pure gas?

  1. Ntural gas
  2. Water gas
  3. Laughing gas
  4. Coal gas
Question 5 Multiple Choice (Single Answer)

Which of the following obey the law of constant proportions in their formation?

  1. Mixtures
  2. Compounds
  3. Elements
  4. Colloids
Question 6 Multiple Choice (Single Answer)

Among the following, which is\are the difference between compound and mixture?

  1. The constituents of a compound can be separated only by chemical methods.

    The constituents of a mixture can be separated easily by physical methods.
  2. Compounds are pure substances.

    Mixtures are impure substances.
  3. The constituents of a compound are present in a fixed ratio.

    The constituents of a mixture are present in varying ratios.
  4. All of above
Question 7 Multiple Choice (Single Answer)

________is chemically mixed whereas_______is physically combined.

  1. Element, compound
  2. Compound, mixture
  3. Mixture, compound
  4. Mixture, element
Question 8 Multiple Choice (Single Answer)

Which of the following is not a property of mixtures?

  1. Components of mixtures are present in a varying proportions
  2. They are always homogeneous
  3. The components of mixtures retain their original properties
  4. The components of mixtures can be separated by physical means
Question 9 Multiple Choice (Single Answer)

Which of the following methods can be used to separate hydrogen and oxygen in water?

  1. Boiling
  2. Electrolysis
  3. Distillation
  4. None of the above
Question 10 Multiple Choice (Single Answer)

Each component of a ______ retains its individual properties.

  1. Compound
  2. Element
  3. Mixture
  4. Solute
Question 11 Multiple Choice (Single Answer)

Which of the following is not an example of compound?

  1. Brass
  2. Air
  3. Bitumen
  4. All of the above
Question 12 Multiple Choice (Single Answer)

Mixture is different from a compound. True or false?

  1. True
  2. False
Question 13 Multiple Choice (Single Answer)

The components present in mixtures are in :

  1. fixed proportion
  2. variable proportion
  3. Both A and B
  4. None of the above
Question 14 Multiple Choice (Single Answer)

Which of the following is not a property of mixture?

  1. Does not have a sharp melting or boiling point
  2. Heat is taken in or given out in the preparation
  3. Can be separated by physical means
  4. May be homogeneous or heterogeneous
Question 15 Multiple Choice (Single Answer)

Which of the following statement is incorrect?

  1. In compounds components are present in definite proportion whereas in mixtures components are present in varying proportion
  2. Compounds are homogenous whereas mixtures are mostly heterogeneous
  3. Particles in a compound are generally of same kind whereas in mixtures they are of different kind
  4. None of the above
Question 16 Multiple Choice (Single Answer)

Which of the following is a characteristic property of both mixtures and compounds?

  1. Their properties are same as those of their components
  2. Energy is released when they are formed
  3. Their masses are equal to the sum of the masses of their components
  4. They contain the components in fixed proportions
Question 17 Multiple Choice (Single Answer)

Ionic compounds have ____ melting and boiling points whereas covalent compounds have _____ melting and boiling point.

  1. low, high
  2. moderate, low
  3. high, low
  4. moderate, high
Question 18 Multiple Choice (Single Answer)

Which of the following can give further simplification using ordinary means?

  1. An element or a mixture
  2. A mixture or a compound
  3. A mixture or an atom
  4. An element or a compound
Question 19 Multiple Choice (Single Answer)

A commercial cake is :

  1. a molecule
  2. a mixture of compounds
  3. an isotope
  4. an isomer
  5. an acid salt
Question 20 Multiple Choice (Single Answer)

In which row are the substances correctly classified?

  1. element - brass; compound - sulfur; mixture - water
  2. element - sulfur; compound - brass; mixture - water
  3. element - sulfur; compound - water; mixture - brass
  4. element - water; compound - sulfur; mixture - brass
Question 21 Multiple Choice (Single Answer)

Which method separates a mixture of sugar and glass?

  1. dissolve, filter and evaporate
  2. distillation
  3. fractionally distill
  4. use chromatography
Question 22 Multiple Choice (Single Answer)

Which one of the following is neither an element nor a compound?

  1. Air
  2. Glucose
  3. Gold
  4. Water
  5. Carbon
Question 23 Multiple Choice (Single Answer)

Which of the following is not a property of compounds?

  1. Components are present in a fixed proportions
  2. They are always homogeneous
  3. The components in compounds do not retain their original properties
  4. The components in compounds can be separated by physical means
Question 24 Multiple Choice (Single Answer)

The components in compounds ______ their original properties.

  1. retain
  2. do not retain
  3. both A and B
  4. none of the above
Question 25 Multiple Choice (Single Answer)

The components in mixtures _______ their original properties. 

  1. retain
  2. do not retain
  3. both A and B
  4. none of the above
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