Question # 1

The percentage of water in human body is.

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40%

50%

60%

70%

At dynamic equilibrium:

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The reactions stops to proceed

The amounts of reactants and products are equal

The speed of the forward is reverse reactions are equal

The reaction can no longer be reversed

Dextrose is a crystallized:

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sucrose

lactose

glucose

fructose

___________ is not green house effect.

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Increase of food chain

increase atmospheric pressure

Increase of sea level

Increase of flood risks

Brown hair contains.

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Iron compound

Copper compound

titanium compound

Both a and b

Concentration of the copper ore is carried out by:

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Calcinations

Roasting

Forth flotation

Distillation

The value of constant of ionic product of water Kw at 25 C.

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1.0 x 10^-4

1.0 x 10¹⁴

1.0 x 10^-4

1.0 x 10⁴

Natural gas contains.

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Methane

Ethane

Propane

All

What percentage of nitrogen and oxygen is in the atmosphere.

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69%

79%

9%

89%

Coal is the mixture of

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Hydrogen

Methane

Carbon monoxide

All

Density of water at 4°C is:

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0.976 gem-3

1 gem-3

0.956 gem-3

1.1 gem-3

In an irreversible reaction dynamic equilibrium:

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Never establishes

Established before the completion of reaction

Establishes after the completion of reaction

Establishes readily

The chemical used in Clark's method is:

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CaO

slaked lime(Ca(OH)s)

washing soda

sodium zeolite

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