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Chemistry

Chemistry
Which gas is most stable at room temperature

H2
F2
N2
O2

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Chemistry
Ultraviolet rays can be used in water treatment as

Disinfectant
Flocculator
Precipitator
Hydrolyser

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Chemistry
The main buffer system of the human blood is

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

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Chemistry
Which of the inert gases can form compounds?

Helium
Argon
Xenon
Krypton

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Chemistry
The pH of lemon juice is expected to be

Nothing can be predicted
Less than 7
More than 7
Equal to 7

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Chemistry
Dry powder fire extinguishers contain

Sand and potassium carbonate
Sand and sodium carbonate
Sand
Sand and sodium bicarbonate

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