Physical and Chemical Changes Sample Questions for Class 7
Question 1
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 2
CuCO3 ----> CuO + CO2.
The above reaction is of which type?
A. Combination reaction
B. Double displacement
C. Oxidation
D. Thermal decomposition
Question 3
Reaction of sulphuric acid and sodium hydroxide forms sodium sulphate and water.
This is an example of _________.
A. Double displacement reaction
B. Neutralisation reaction
C. Percipitation reaction
D. Combination reaction
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
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