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56 . When an iron nail gets rusted, iron oxide is formed
A. with increase in the weight of the nail
B. with decrease in the weight of the nail
C. without any change in the weight of the nail
D. without any change in colour or weight of the nail

57 . Galvanised iron sheets have a coating of
A. chromium B. tin
C. zinc D. lead

58 . The group of metals Fe, Co, Ni may best called as
A. main group metals B. transition metals
C. alkali metals D. rare metals

59 . Among the various allotropes of carbon
A. diamond is the hardest, lamp black is the softest
B. coke is the hardest, graphite is the softest
C. diamond is the hardest, coke is the softest
D. diamond is the hardest, graphite is the softest

60 . The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
A. sulphur B. fluorine
C. bromine D. chlorine




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