Q131. The ratio of mass of solute in mg to the volume of solution in litre is known as ______

Q132. Corrosion of Molybdenum forms ______ film.

Q133. What is the main difference between high-temperature dry corrosion and oxidation corrosion?

Q134. _________ avoids metal to metal contact and reduces wear and tear and fiction

Q135. Which of the following is NOT an organic compound?

Q136. The corrosion that occures when a part of the metal is exposed to different air concentration from the other part of the metal is known as _____________.

Q137. Which of the following hydrocarbons exhibits chain isomerism?

Q138. The number of valence electrons in a carbon atom is:

Q139. Which of the following is the most popular of solid lubricants?

Q140. What is the main disadvantage of boundary lubrication?