In some melting point instruments, the sample is placed on a microscope slide which is then placed on top of a heated metal block, and the temperature of the metal block is raised until melting is observed. If the sample to be melted were placed on a microscope slide then heated, leaving finger oils on the microscope slide is not good technique, but it won't affect the observed melting point.

A. True
B. False

"In some melting point instruments, the sample is placed on a microscope slide which is then placed on top of a heated metal block, and the temperature of the metal block is raised until melting is observed. If the sample to be melted were placed on a microscope slide then heated, leaving finger oils on the microscope slide is not good technique, but it won't affect the observed melting point" is FALSE.

Option B

Explanation:

A thin flat piece of glass of 75 by 26 mm size and 1 mm thick, used to carry objects sample under a microscope for investigation is known as a "microscope slide". It is used with a cover slip or glass cover which is mounted over the specimen to stabilize sample's location and prevent from further any contamination.

If a slide, cover slip, spatula or any other equipment which is used while preparing sample for examination is not sterilized appropriately and get contaminated further, than it will show impact on results of experiment or simple observations. Therefore well sterilized and proper handled equipment are needed to perform examinations.

the answer is a and have a great day