Civil Services TNPSC Group 1 (New Syllabus) Mock Test 2025 General Science Chemistry Chemical Reaction
Consider the pairs.
| S.No | Reaction | Example |
| 1. | Combination | Limestone changing into quicklime in the presence of heat |
| 2. | Decomposition | reaction when Iron nails are dipped in copper sulphate solution |
| 3. | Displacement | Calcium oxide and water producing slaked lime |
Which among the above pairs is correct?
1
1 and 2 only
2
2 and 3 only
3
All pairs are correct
4
No pairs are correct
5
Answer not known