1. Colour imparted to the Bunsen flame by strontium salt is
2. An oxidising agent is a
3. Silver gets corroded due to ________ in air.
4. Which of the following causes the rusting of iron?
a. Oxidation
b. Reduction
c. Chemical reaction with oxygen
d. Chemical reaction with CO2
a. Oxidation
b. Reduction
c. Chemical reaction with oxygen
d. Chemical reaction with CO2
5. Photo-oxidation process is initiated by
6. Copper substances when exposed to air gains a green coating due to the formation of:
7. Browning of paper in old books is caused by
8. Catalyst is a substance which
9. When quick lime is added to water
10. What is the element that is in the highest percentage in the composition of the earth ?
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