Q. Chlorophyll is a naturally occurring chelate compound in which central metal is

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Q. Which of the following is used in pencils?

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Q. Which of the following metals forms an amalgam with other metals?

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Q. Chemical formula for water is

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Q. The gas usually filled in the electric bulb is

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Q. Washing soda is the common name for

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Q. Quartz crystals normally used in quartz clocks etc. is chemically

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Q. Which of the gas is not known as green house gas?

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Q. Bromine is a

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Q. The hardest substance available on earth is

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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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