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Chemistry

Chemistry
Which of the following pollutants is main product of automobile exhaust ?

CO
CO2
Hydrocarbons
NO

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Chemistry
A colloidal system in which a liquid is dispersed in a liquid is called

Sol
Gel
Precipitate
Emulsion

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Chemistry
Element 106 was discovered by

Kurchatove
Seaborg
Lawrence
Rutherford

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Chemistry
The green colour seen in firework displays is due to the chloride salt of :

Barium
Strontium
Calcium
Sodium

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Chemistry
Which of the following is used to iodise common salt ?

Potassium iodide
Iodine
Sodium iodide
Potassium iodate

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Chemistry
The metal ion present in Vitamin B12 is

Iron
Nickel
Cobalt
Zinc

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