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4. True or False. If False, give the correct statement I

1. Concentrated phenol is used as a disinfectant.

As a disinfectant, low-concentrated phenol is used.
As a disinfectant, concentrated phenol is used.

2. Gypsum is largely used in medical industries.

Gypsum is largely used in cement preparation.
Gypsum is widely used in the medical field.

3. Plaster of Paris is obtained from heating gypsum.

Gypsum is obtained from the heating of the Plaster of Paris.
Gypsum is heated to make plaster of Paris.

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