Question # 1

Temporary hardness is because of.

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

The reaction in which the products do not recombine to form reactants are called.

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Inversible reactions

Reversible reaction

Decomposition

Addition

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

When NaHCO₃ is heated it forms.

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CO₂

Ca(OH)₂

CaCO₃

CaO

Grease stains from clothes are removed by sing.

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Ammonium nitrate

Aluminium hydroxide

Ammonium hydroxide

Aluminum chloride

Vital force theory was rejected by.

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Jabir Bin Hayan

Drawin

Wohler

Berzellius

The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water.

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Nitrogen

Hydrogen

Oxygen

Carbon

Alkynes are also called.

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Olefine

Ethene

Paraffins

Acetylenes

Guldberg and waage put forward law of mass action in:

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1860

1869

1870

1879

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

What is pOH of 0.01 M solution of HCl?

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1

4

12

13

Which hydrocarbon decolorizes the pink colour of acidic solution of potassium permanganate?

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CH₄

C₂H₄

C₂H₆

C₂H₅

Dilute acid react with carbonates the produce product except _________

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Salt

Water

Carbon di oxide

Hydrogen gases

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