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1.
Which of the following salts can cause temporary hardness in water?
Mg(HCO3)2
Fe2(SO4)3
MgCl2
CaSO4
2.
Which of the following salts can cause temporary hardness in water?
Mg(HCO3)2
Fe2(SO4)3
MgCl2
CaSO4
3.
Temporary hardness of water is removed by heating because
it is caused by insoluble salts.
the salts causing the hardness become soluble.
calcium hydrogen trioxocarbonate (IV) in water is decomposed by heat.
calcium trioxocarbonate (IV) is produced.
4.
Which of the following physical properties of water are correct?
I. It is tasteless.
II. It has a pH of 7.
III. It is colourless.
II and III only
I and III only
I and II only
I, II and III
5.
Which of the following sources of water is not directly linked to the sea?
Rivers
Streams
Lagoons
Ponds
6.
Which of the following phenomena is associated with the moon?
Tide
Earthquake
Sea breeze
Volcanic eruption
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