Physical and Chemical Changes Sample Questions for Class 7
Question 1
Decomposition of food is what kind of change?
A. Physical change
B. Chemical change
C. Both a and b
D. Cannot Say
Question 2
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 3
CuCO3 ----> CuO + CO2.
The above reaction is of which type?
A. Combination reaction
B. Double displacement
C. Oxidation
D. Thermal decomposition
Question 4
Nacl + AgNO3 ----> AgCl + NaNO3.
Which is the percipitate and what is its colour?
A. Silver nitrate, grey
B. Sodium nitrate , white
C. Sodium chloride, grey
D. Silver chloride, white
Question 5
Burning of candle shows which change?
A. Physical change
B. Chemical change
C. Both a and b
D. None of the above