MDCAT Chemistry MCQ #359

MDCAT Chemistry MCQ #359

1. Question 1

   Q1. A laboratory technician prepares a formalin solution for the preservation of biological specimens. What is the standard percentage composition of formaldehyde in this solution?

   • A) 10% formaldehyde, 40% methyl alcohol, 50% water
   • B) 40% formaldehyde, 8% methyl alcohol, 52% water
   • C) 52% formaldehyde, 8% methyl alcohol, 40% water
   • D) 8% formaldehyde, 40% methyl alcohol, 52% water

   Answer: 40% formaldehyde, 8% methyl alcohol, 52% water

   Explanation: Formalin contains 40% formaldehyde, 8% methyl alcohol, and 52% water; 10% formaldehyde is too dilute for standard industrial formalin.