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

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 ?