101) The spot at which corrosion occurs on the surface of an iron material, behaves as

A) cathode
B) anode
C) either cathode or anode
D) it has no relation with electrode

102) Which of the following minerals contains manganese

A) galena
B) cinnabar
C) pyrolusite
D) horn silver

103) Which of the following methods are used to prevent corrosion

A) painting
B) electroplating
C) sacrificial electrode of another metal
D) all of these

104) The ability of an element to form the longest chain with its own atoms is called as

A) allotropy
B) hybridization
C) catenation
D) isomerism

105) Hydrocarbons that contain only single bonds between the carbon atoms are called

A) alkanes
B) alkenes
C) alkynes
D) all of these