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Chemistry

Chemistry
Total number of halogen elements found in the periodic table is

3
8
13
5

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Chemistry
Which is a natural colloid ?

Urea
Blood
Cane-sugar
Sodium chloride

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Chemistry
Brass is made of

Tin and lead
Copper, tin and zinc
Copper and zinc
Copper and tin

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Chemistry
Which one is the most dense liquid from the below

None of these
Gasolin
Water
Choloform

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Chemistry
The molecular mass of a gas is

Not related to its vapour pressure
Twice its vapour pressure
Half its vapour pressure
Equal to its vapour pressure

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Chemistry
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

ozone
methane
helium
oxygen

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