/6 Science Quiz (for 12 to 16 years old): Quiz 4 1 / 6Among the various allotropes of carbon, diamond is the hardest, graphite is the softest diamond is the hardest, lamp black is the softest coke is the hardest, graphite is the softest diamond is the hardest, coke is the softest 2 / 6When an iron nail gets rusted, iron oxide is formed without any change in colour or weight of the nail with decrease in the weight of the nail with increase in the weight of the nail without any change in the weight of the nail 3 / 6Galvanised iron sheets have a coating of chromium tin zinc lead 4 / 6The average salinity of sea water is 2.5% 3.5% 2% 3% 5 / 6In which of the following activities silicon carbide is used? Making casts for statues cutting very hard substances Making cement and glass Disinfecting water of ponds 6 / 6The group of metals Fe, Co, Ni may best called as transition metals alkali metals rare metals main group metals Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback
