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Chemistry

Chemistry
The third shell of an atom can have a maximum of ______ electrons

21
18
13
15

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Chemistry
Which of the following metals occurs in free state ?

Iron
Lead
Zinc
Copper

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Chemistry
The main buffer system of the human blood is

NH2CONH2 - NH2CONH+
H2CO3 - HCO3
CH3COOH - CH3COO-
H2CO3 - CO32-

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Chemistry
Which is the heaviest metal among the following?

Iron
Copper
Gold
Silver

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Chemistry
The chemical used for cloud seeding for artificial rains is

Silver Iodide
Potassium Bromide
Silver Nitrate
Potassium Nitrate

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Chemistry
Emulsifier is an agent which

Accelerates the dispersion
Stabilizes an emulsion
Homogenizes the emulsion
Aids the flocculation of emulsion

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