Question # 1

Which one of the following ion does not cause hardness in water?

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Ca⁺²

Mg^-2

SO^-2

Na⁺

Which of the following salt is soluble in water.

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NaCl

KCl

Na₂SO₄

All of them

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 gas is used to destroy harmful bacteria in water.

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Iodine

Chlorine

fluorine

Bromine

The water which produces good lather with soap is called:

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soft water

hard water

heavy water

typical water

Hookworm is a parasite that infects the:

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large intestine

small intestine

stomach

liver

The percentage of ocean in world water is.

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50%

67%

97%

25%

Which disease cause when humans use water of industrial effuents.

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Cancer

Asthma

Jaundica

Cholera

Which one of the diseases causes severe diarrhea and can be fatal?

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Jaundice

Dysentery

Cholera

Typhoid

One H₂O molecule can form hydrogen bonding with how many other H₂O molecules?

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One

Two

Three

Four

The density of water is ................. at 4^oC

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1 gcm^-1

2 gcm^-1

3 gcm^-1

4 gcm^-1

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

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