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i was reading a safety guide book and it asked one of the following questions.

Which of the following safety precautions is necessary for the 'Preparation of a Complex Iron Salt' experiment?

A. 3% H2O2 is a mild oxidizing agent avoid contact with the skin.
B. Oxalate compounds are easily absorbed through the skin and toxic to kidneys use gloves while handling.
C. Ethanol is flammable avoid ignition sources.
D. Sulfuric and oxalic acids can cause burns use gloves while handling.
E. All of these precautions are necessary.

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