Q. The variety of coal in which the deposit contains recognisable traces of the original plant material is

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Q. Tetraethyl lead is used as

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Q. Which of the following is used as a lubricant?

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Q. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

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Q. The gases used in different types of welding would include

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Q. The property of a substance to absorb moisture from the air on exposure is called

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Q. In which of the following activities silicon carbide is used?

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Q. The average salinity of sea water is

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Q. When an iron nail gets rusted, iron oxide is formed

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Q. Galvanised iron sheets have a coating of

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Q. Among the various allotropes of carbon,

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Q. The group of metals Fe, Co, Ni may best called as

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Q. Heavy water is

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Q. 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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Q. The element common to all acids is

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Q. Non stick cooking utensils are coated with

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Q. Monazite is an ore of

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Q. Carbon, diamond and graphite are together called

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Q. Potassium nitrate is used in

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Q. Permanent hardness of water may be removed by the addition of

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