Physical and Chemical Changes Sample Questions for Class 7
Question 1
Burning of candle shows which change?
A. Physical change
B. Chemical change
C. Both a and b
D. None of the above
Question 2
H2S + Cl2 ---> S + 2HCl
Identify oxidising agent and reducing agent.
A. Chlorine is oxidising and hydrogen sulphide is reducing agent
B. Hydrogen sulphide is oxidising and chlorine is reducing
C. Sulphur is oxidising and hydrogen chloride is reducing
D. Hydrogen chloride is oxidising and sulphur is reducing
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