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Chemistry

Chemistry
Laughing gas is

Nitric oxide
Nitrogen trioxide
Nitrous oxide
Nitrogen pentoxide

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Chemistry
Which is a natural colloid ?

Blood
Sodium chloride
Urea
Cane-sugar

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Chemistry
Soap is prepared by boiling caustic soda with

Glycerine
Fats
Kerosene oil
Alcohol

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Chemistry
Percentage of lead in lead pencils is

31-66
40
80

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Chemistry
The metal used for making aircrafts and rockets is

Nickel
Copper
Aluminium
Lead

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Chemistry
Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?

Nitrogen
Neon
Sodium
Hydrogen

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