Maryland Cosmetology State Practice Exam

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Which of the following elements are found in the hair?

COHNS
H2O
NaCl
C6H12O6

The correct answer is: COHNS

The elements found in hair are carbon, oxygen, hydrogen, nitrogen, and sulfur (COHNS). These elements make up proteins called keratin, which is the main structural component of hair. Option B, H2O, is incorrect because it is the chemical formula for water, which is not found in hair. Option C, NaCl, is incorrect because it is the chemical formula for salt, which is not found in hair. Option D, C6H12O6, is incorrect because it is the chemical formula for glucose, a type of sugar, which is not found in hair. While all of these elements may be found in the body, they are not specifically found in hair. Therefore, option A is the correct answer.