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Question 1:

In which one of the following situations chemical reaction does not occur?

Question 2:

DIRECTIONS: Read the following two statements and choose the correct answer. 

Statement 1 – When baking powder is heated , carbon dioxide gas is released .This is a physical change  .

Statement 2 – Carbon dioxide gas evolved is used in making cake fluffy .

Question 3:

Match List I with List II

List I

List II

1. Formation of rust on iron rod

A: Physical Change

2. Physical process

B: Chemical Change

3. Curdling of milk

C: Rusting

4. Electric light is switched on

D: woolen yarn to knitted sweater

Question 4:

Two changes are stated below –

  1. The blue colour of copper sulphate disappears when heated strongly.
  2. Iron nail is kept in a copper sulphate solution.

Which of the above change is a physical change?

Question 5:

Hydrochloric acid is added to a beaker containing a piece of zinc. This is an example of:

  1. a chemical change
  2.  a physical change
  3.  Double displacement reaction
  4. Displacement reaction

Question 6:

Which is the method to prevent rusting?

  1. Painting
  2. Greasing
  3.  Galvanization
  4. Precipitation

Question 7:

When magnesium ribbon is burnt , heat and light are produced.The burning of magnesium is a:

  1. reversible change
  2.  physical change
  3.  chemical and exothermic change
  4. combination reaction

Question 8:

Take 20 mL of distilled water in a clean test tube and dissolve 1.0 g of copper sulphate in it. Add 2 or 3 drops of dil. sulphuric acid to it.  When we drop an iron nail into this blue coloured solution, blue colour changes to green after sometime. Which type of change is illustrated by this activity?

Question 9:

Choose the correct option on the basis of two statements (i) and (ii) 

(i) Ammonia reacts with hydrogen chloride to form ammonium chloride .

(ii) Ammonium chloride has a property of directly changes into gaseous state from solid state .This property of ammonium chloride is known as sublimation .

Question 10:

Which of the following is a chemical change?