Consider the following chemicals: 1. Benzene 2. Carbon tetrachloride 3. Sodium Carbonate 4. Trichloroethylene Which of the above is/are used as dry-cleaning chemicals?
- A1 Only
- B2 Only
- C1, 2 and 4 OnlyCorrect
- D1, 2, 3 and 4
Explanation
The correct answer is C because Benzene, Carbon tetrachloride, and Trichloroethylene have all been used as dry-cleaning chemicals.
- Benzene: Was historically used as a dry-cleaning solvent, though its use has largely been discontinued due to its flammability and toxicity.
- Carbon tetrachloride: Was a common non-flammable dry-cleaning solvent but its use has been phased out due to its toxicity and ozone-depleting properties.
- Sodium Carbonate: This is washing soda, an alkaline salt used in traditional wet washing (laundry detergents) to soften water and aid cleaning. It is not a solvent for dry cleaning, which by definition uses non-water-based solvents.
- Trichloroethylene: A chlorinated solvent that was used in dry cleaning, particularly for industrial applications, but its use has also declined due to health concerns.
Therefore, 1, 2, and 4 are correct, making C the right option.
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