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Transformation of Substances - I

Transformation of Substances - I

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is NOT a characteristic of physical change?

  1. It is temporary
  2. It is irreversible
  3. No new substances are formed
  4. No change is mass occurs
Question 2 Multiple Choice (Single Answer)

Which of the following is NOT a physical change?

  1. Melting of ice
  2. Freezing of water
  3. Burning of coal
  4. Sublimation
Question 3 Multiple Choice (Single Answer)

Which of the following is Not a chemical change?

  1. Vaporization of water
  2. Curdling of milk
  3. Charring of Sugar
  4. Rusting of iron
Question 4 Multiple Choice (Single Answer)

Which of the following is NOT true for chemical change?

  1. New substance are formed.
  2. No change is mass of substance occurs.
  3. It can not be reversed.
  4. It release or absorb heat or other energy.
Question 5 Multiple Choice (Single Answer)

Which of the following change could be reversed?

  1. Digestion of food
  2. Photosynthesis
  3. Rushing of iron
  4. Sublimation
Question 6 Multiple Choice (Single Answer)

Why do you feel a cooling sensation on skin after application of balms like Vicks or Iodex?

  1. because of condensations of constituents of the balm.
  2. because of evaporation of constituents of the balm.
  3. because of liquification of constituents of the balm.
  4. because of sublimation of constituents of the balm.
Question 7 Multiple Choice (Single Answer)

What will happen when some cold water, placed in a pot, is held over the water vapours emerging from the boiling water?

  1. water is the pot becomes warmer.
  2. water is the pot becomes colder.
  3. water is the pot evaporates.
  4. water is the pot condenser.
Question 8 Multiple Choice (Single Answer)

The melting point of a solid is same as the

  1. freezing point of the corresponding liquid.
  2. boiling point of the corresponding liquid.
  3. sublimation point of the corresponding liquid.
  4. liquification temperature of the corresponding gas.
Question 9 Multiple Choice (Single Answer)

The melting point and the boiling point of a pure substance vary according to

  1. type of flame used for healing.
  2. rate of increase is temperature.
  3. pressure applied.
  4. the shape of container used for heating.
Question 10 Multiple Choice (Single Answer)

What will be the change in melting point of ice if sodium chloride is added to it?

  1. It is lowered.
  2. It is increased.
  3. No change is melting point.
  4. Ice does not melt.
Question 11 Multiple Choice (Single Answer)

Which of the following can be present is a freezing mixture?
(i) Common salt
(ii) Magnesium hydroxide
(iii) Calcium chloride
(iv) Sodium hydroxide

  1. (i) and (ii)
  2. (ii) and (iv)
  3. (i) and (iii)
  4. (iii) and (iv)
Question 12 Multiple Choice (Single Answer)

What type of liquids can be separated by the method of fractional distillation?

  1. Liquids with same boiling point.
  2. Liquids with same melting point.
  3. Liquids which differ in their boiling points by 20°C or more.
  4. Liquids which differ in their boiling points by less than 20°C.
Question 13 Multiple Choice (Single Answer)

What is the impact of soluble impurities in a substance on its boiling point?

  1. It raises boiling point.
  2. It reduces boiling point.
  3. They may increase or lower the boiling point.
  4. It does not effect boiling point.
Question 14 Multiple Choice (Single Answer)

Which of the following statement is TRUE?

  1. Boiling of tap water is higher them distilled water.
  2. Boiling point of distilled water is higher than tap water.
  3. Boiling point of tap water and distilled water is same.
  4. Chemical composition of tap water and distilled water is same.
Question 15 Multiple Choice (Single Answer)

Which of the following statement is TRUE?

  1. Energy is given out on forming new bond but required for breaking a bond.
  2. Energy is required for forming a new bond but given out for breaking a bond.
  3. Energy is given out while forming or breaking a bond.
  4. Energy is required for forming or breaking a bond.
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