Question # 1

Crude oil is heated to the fractionating furnace upto.

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300 ^oC

350^oC

400^oC

450^oC

Matte is a mixture of:

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FeS and CuS

Cu₂O and FeO

Cu₂S and FeS

CuS and FeO

Normally rain water is weakly acidic because of.

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SO₃ gas.

CO₂gas.

SO₂gas.

NO₂gas.

The two major components of atmosphere are:

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Hydrogen and oxygen

Nitrogen and Hydrogen

Nitrogen and oxygen

Oxygen and water.

Amino acid are the building blocks of .

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Proteins

Carbohydrates

Vitamins

fats

A strange bitter smell noticed near photo copier machine is of.

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H₂S

SO₂

O₂

O₃

Dehydrohalogenation take place in the presence of.

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Aqueous NaOH

Alcoholic KOH

Aqueous KOH

Alcoholic NaOH

Compound of metal exist under earth crust are called.

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Ore

Gangue

Minral

None of these

when a system is in equilibrium state or in dynamic equilibrium state.

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Reactants and product are equal

Forward reactions stops

Reverse reactions stops

Forward reaction rate and reverse reaction rate

When acid react with carbonates and bicarbonates which gas is evolved?

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H2

CO₂

Cl₂

N₂

The carbon contents in lignite is.

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80%

50%

60%

70%

The colour of litmus paper in strong acidic solution.

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Red

Blue

Yellow

Colourless

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

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NaHCO₃

NH₄HCO₃

Na₂CO₃

(NH₄)₂CO₃

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