Question # 1

Which element protects teeth from decay?

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Potassium

Fluorine

Sodium

Calcium

How many percentage to water contains oceans?

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67%

77%

87%

97%

Which one of the following properties of water is responsible for rising of water in plants?

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Specific heat capacity

Viscosity

Excellent solvent action

Capillary action

Which salt cause permanent hardness in water is:

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Ca(HCO₃)₂

Mg(HCO₃)₂

CaCl₂

KCl

Permanent hardness can be removed by using .

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Soda lime

Sodium Zeolite

Quick lime

Lime water

Water molecule has a structure:

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Ionic

Non polar

Tetrahedral

Polar

Water has a maximum density at 4 ^oC

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12 cm^-3

2 g cm^-3

1 g cm^-3

4 gcm^-3

A disease is caused by excess of bile pigments in the blood is.

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Typhoid

Jaundice

Cholera

Dysentery

Temporary hardness is due to the presence of bicarbonates of.

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Calcium

Magnsium

Both of them

None of them

Which disease causes bone and tooth damage?

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Fluorosis

Hepatits

Cholera

Jaundice

Which one of the following salts makes the water permanent hard.

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NaCO₃

NaHCO₃

Ca(HCO₃)₂

CaSO₄

Which of the following in insoluble in water.

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Benzene

NaCl

KCl

All of them

soap is the sodium salt of long chain.

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Amino acids

Fatty acids

Nucleotides

None of them

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10th Class Chemistry Chapter 15 Water English Medium KPK Boards Online Mcqs MCQs With Answers

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