Question # 1

Clark's method is used to remove the hardness of water, in this method which is used.

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Ca(HCO₃)₂

Na-Zeolite

Ca-Zeolite

Ca(OH)₂

Temporary hardness is removed by adding.

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Quick lime

Slaked lime

Lime stone

Lime water.

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

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

Coal tar contains compounds

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Benzene

Phenol

Toluene

All

A sea level the boiling point of water is.

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0^oC

98^oC

100^oC

110^oC

When bones are heated they give.

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Starch

Gelatin

Fats

Oils

Which of one the following is Lewis base?

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BF3

H+

NH3

Ag+

The value of K_c depends on.

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Temperature

Pressure

Volume

Atmosphere

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

How much amount of sunlight reaches up to earth and absorbed:

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26%

32%

50%

18%

Arrhenius put forward acid base concept in.

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1878

1786

1787

1790

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