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The raw materials for the manufacture of...

The raw materials for the manufacture of Portland cement (or just cement) are limestone,

A

clay, and sand

B

sand, and gypsum

C

clay, and gypsum

D

gypsum, and alumina

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The correct Answer is:
C
When clay ad limestone are strongly heated together, they fuse and react to form cement clinker. This clinker is mixed with 2-3% by weight of gypsum `(CaSO_(4).2H_(2)O)` to form cement. Cement, animportant building material, was discovered by Joseph Aspdin. Hwe noticed that when a strongly heated mixture of limestone ad clay was mixed with water and allowed to stand for some time, it hardened to a stone-like mass resembling portland rock (a popular building stone). he therefore named it portland cement.
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Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Portland cement does not contain

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. The percentage of lime in portland cement is approximately

R SHARMA-THE S BLOCK ELEMENTS-Follow-up Test 11
  1. A suspension of slaked lime in water is called

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  2. Bleaching powder is prepared by passing chlorine into

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  3. Which of the following changes occur when an excess of CO(2)(g) is pas...

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  4. Limestone rock is the commonest form of calcium carbonate which also o...

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  5. Calcium carbonate, commonly called limestone, is prepared by passing C...

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  6. Which of the following in incorrect for CaCO(3) ?

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  7. Calcium carbonate along with is used as a flux in the extraction of m...

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  8. Calcium carbonate is used as (i) a filler in cosmetics (ii) a cons...

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  9. Plaseter of Paris, a white powder, is

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  10. Plaster of Paris is obtained when gypsum is heated to

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  11. Plaster of Paris has a remarkable property of setting with water. On m...

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  12. The raw materials for the manufacture of Portland cement (or just ceme...

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  13. Cement is essentially a finely powdered mixture of calcium silicates a...

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  14. Which of the following in incorrect ?

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  15. All enzymes that utilize ATP in phosphate transfer require

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  16. The main pigment for the absorption of light in green plants is chloro...

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  17. About 99% of body Ca is present in bones and teeth as

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  18. Ca^(2+) ions play an important role in (i) neuromuscular function ...

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  19. The calcium concentration in plasma is regulated at about mg L^(-1).

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  20. Bone is not an inert and unchanging substance but is continuously bein...

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