Match the following lists regarding the physical properties of cement :
| List-I | List-II |
|---|---|
| P.Loss on ignition | 1.Causes expansion |
| Q.Insoluble residues | 2.Due to evaporation of moisture and carbondioxide |
| R.Lime and alumina content | 3.Due to inactive materials like gypsum |
| S.Sulphur content | 4.Causes unsoundness |
Select the correct answer using the code given below :
- A2 3 4 1Correct
- B3 4 1 2
- C4 1 2 3
- D2 4 1 3
Solution
Concept
Chemical tests on cement
Step-by-step solution
1. Loss on ignition is due to loss of moisture and CO₂ → 2. 2. Insoluble residue arises from inactive materials → 3. 3. Excess lime (the lime–alumina ratio) causes unsoundness → 4. 4. Excess sulphur (SO₃) causes expansion → 1.
Explanation
Each chemical limit in the cement specification is placed to prevent a specific defect.
Why the other options are wrong
The other codes mismatch the limits and their effects.
Shortcut
LOI = moisture + CO₂; SO₃ excess = expansion; free lime = unsoundness.
Correct answer: A) 2 3 4 1