Physical and Chemical Changes Sample Questions for Class 7
Question 1
Which is the correct statement about oxidation?
A. In this reaction hydrogen is added
B. In this reaction oxygen is added
C. In this reaction oxygen is removed
D. In this reaction hydrogen is removed and oxygen is added
Question 2
When photosynthesis takes place, oxygennis given out. What kind of change is it?
A. Chemical
B. Physical
C. Both a and b
D. Cannot Say
Question 3
CuCO3 ----> CuO + CO2.
The above reaction is of which type?
A. Combination reaction
B. Double displacement
C. Oxidation
D. Thermal decomposition
Question 4
Iron is dipped in copper sulphate.
What products are formed?
A. Copper and iron
B. Iron sulphate and copper
C. No change
D. Only iron sulphate
Question 5
Decomposition of food is what kind of change?
A. Physical change
B. Chemical change
C. Both a and b
D. Cannot Say