Calcium carbonate is heated with which of the following substances to make cement?
0%
Sand
0%
Clay
0%
Aggregate (gravel and small pebbles)
100%
All of the above
Q.2.
Heated limestone was left to cool and when it was cold a few drops of water were added to it. Then a piece of moist litmus paper was touched against it. What was observed?
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The piece of heated limestone hissed, crumbled and became hot. The litmus paper turned red.
0%
The piece of heated limestone hissed, crumbled and became hot. The litmus paper turned blue.
0%
The piece of heated limestone turned pale yellow and the litmus paper stayed the same.
0%
Nothing happened and the litmus paper stayed the same.
Q.3.
What is the formula of calcium carbonate?
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CaC3
0%
CaCO2
0%
CaCO3
0%
Ca3CO
Q.4.
A student added some nitric acid to a small quantity of powdered calcium carbonate in a large beaker. Which of the following would have been observed during the experiment?
0%
Brown fumes of nitric oxide
0%
The calcium carbonate frothed up
0%
The calcium carbonate disappeared
0%
A fizzing noise was heard
Q.5.
Some students heated pieces of limestone in a roaring flame of a bunsen burner. What would they have observed as the reaction was taking place?
0%
The limestone spitting and popping
0%
The limestone glowing red hot
0%
The limestone expanding at first, then going smaller
0%
The limestone glowing with an intense white light
Q.6.
What are the products when calcium carbonate thermally decomposes?
0%
Calcium and oxygen.
0%
Calcium and carbonate.
0%
Calcium oxide and oxygen.
0%
Calcium oxide and carbon dioxide.
Q.7.
When calcium carbonate is strongly heated what does it do?
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It thermally decomposes
0%
It optically decomposes
0%
It mentally decomposes
0%
It does nothing
Q.8.
Which of the following statements about limestone is false?
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It reacts with acid rain and is gradually eroded
0%
It is used for making the foundations of roads
0%
It is used in the manufacture of cement
0%
It is not used in agriculture
Q.9.
Which of the following terms best describes calcium oxide?
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Calcium oxide is an acid
0%
Calcium oxide is a base
0%
Calcium oxide is neutral
0%
Calcium oxide is a salt
Q.10.
Calcium oxide is slightly soluble in water and can be used for testing for a gas. What is the gas and what happens to the solution if the gas is present?
0%
Hydrogen is the gas and the solution goes blue
0%
Oxygen is the gas and the solution gives a green precipitate
0%
Nitrogen is the gas and the solution turns a pale straw color
0%
Carbon dioxide is the gas and the solution goes cloudy
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