In which of the following activities silicon carbide is used?
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The average salinity of seawater is
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When an iron nail gets rusted, iron oxide is formed
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Galvanised iron sheets have a coating of
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Among the various allotrope of carbon
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The group of metals Fe, Co, Ni may best called as:
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Heavy water is:
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The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
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The element common to all acids is
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Non stick cooking utensils are coated with
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Monazite is an ore of
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Carbon, diamond and graphite are together called:
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Potassium nitrate is used in
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Permanent hardness of water may be removed by the addition of:
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Soda water contains
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The most important ore of aluminum is
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Most soluble in water is:
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Which of the following was to be discovered first in the chromospheres of the sun?
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Which of the following is in liquid form at room temperature?
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Sodium metal is kept under:
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