Home » mcq » chemistry » Brass gets discoloured in air due to constant exposure in presence of: A. Aluminium phosphide B. Hydrogen sulphide C. Hydrogenated wafers D. Aluminium sulphide
Aluminium phosphide
Hydrogen sulphide
Hydrogenated wafers
Aluminium sulphide
Answer is Wrong!
Answer is Right!
The correct answer is: B. Hydrogen sulphide.
Brass is an alloy of copper and zinc. When brass is exposed to hydrogen sulphide, the copper
64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/>
Subscribe on YouTube
in the brass reacts with the hydrogen sulphide to form copper sulphide. Copper sulphide is a black compound that forms a layer on the surface of the brass, which discolours the brass.
Aluminium phosphide, hydrogenated wafers, and aluminium sulphide are not known to cause brass to discolour.
Aluminium phosphide is a white solid that is used as a rodenticide. It is not known to react with brass.
Hydrogenated wafers are thin slices of semiconductor material that have been coated with a layer of hydrogen. They are used in electronic devices. Hydrogenated wafers are not known to react with brass.
Aluminium sulphide is a white solid that is used as a flame retardant. It is not known to react with brass.