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Chemistry

Chemistry
The octane number of zero is assigned to

2-methyl octane
iso-octane
n-heptane
3-methyl octane

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Chemistry
The main source of carbon monoxide is

Fuel combustion
Industrial process
Transportation
Solid waste disposal

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Chemistry
The amount of chlorine available in water after disinfection is called as

Combined available chlorine
Free chlorine
Free available chlorine
Residual chlorine

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Chemistry
Commercially, sodium bicarbonate is known as

Soda ash
Baking soda
Bleaching powder
Washing soda

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Chemistry
The nuclear particles which are assumed to hold the nucleons together are

neutrons
positrons
electrons
mesons

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Chemistry
The main buffer system of the human blood is

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

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