Question # 1

Which one of the not metal.

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Copper

Carbon

chromium

Iron

Which gas is evolved when acids react with carbonates and bicarbonates?

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Carbon monoxide

Carbon dioxide

Hydrogen

Hydrogen chloride

Metallurgy involves which of the following steps?

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Mining and enrichment

Reduction

Refining and casting.

All of these

Enzymes are proteins which have the following properties except.

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They catalyze reaction

They are highly non-spcific

They are highly efficient

They are pro

Which one contains triple covalent bond?

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Pentane

Ethylene

Acetylene

All

Blonde hair contains compound of.

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Iron

Copper

titanium

Molybdenum

The percentage by volume of nitrogen in dry gas is.

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78.09%

20.94%

0.93%

0.03%

If a liquid has a pH of 7 then it must.

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Be a colourless and odourless liquid

Freeze at 0 ^oC and boil at 100 ^oC

Be natural

Be a solution containing water

In solvay's process slaked lime is used to:

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Prepare CO₂

Prepare quick lime

Recover ammonia

Form Na₂CO₃

In the bacterial decay, the compound of which element are emitted.

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Sulphur

Carbon

Nitrogen

All of them

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

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Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

The color of hydrogen Iodide is:

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Colourless

Black

Red

Pink

The formula of ozone is.

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O₂

O₃

O

CO

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