Question # 1

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

The bond angle between H-O-H in water is:

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104.5^o

104.6^o

104.7^o

104.8^o

If an organic compound has 4 carbon atoms, all singly bonded, it will have the following characteristics except one.

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It will be saturated hydrocarbon

It will hav 8 hydrogen atoms

Its name will be n-butane.

It will be least reactive.

For which reaction Kf is the rate constant?

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Forward reaction

Backward reaction

Upward reaction

Downward reaction

Froth flotation process is used to concentrate.

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Copper ore

Iron ore

Chromium ore

Aluminum ore

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

Concentration is a separating technique in which mineral is separated from.

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Gangue

Silicates

Aluminates

All

Which of one of the following is used as as fumigant:

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Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

When CO₂ is passed through the ammonical brine the only salt that precipitates is:

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NaHCO₃

NH₄HCO₃

Na₂CO₃

(NH₄)₂CO₃

The layer above troposphere extend upto 50 kilometers called.

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Mesosphere

Hydrosphere

Stratosphere

Thermosphere

At the height 880120 km from earth's surface is.

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Troposphere

Mesosphere

Stratosphere

Thermosphere

Ozone depletion was first noticed is.

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1970's

1980's

1990's

1960's

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

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