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When the ore haematite is burnt in air w...

When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces steel but also produces a silicate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equation.

A

`Na SiO_(3)`

B

`CaSiO_(3)`

C

`SiO_(2)`

D

`CaCO_(3)`

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The correct Answer is:
B
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Limestone is a naturally occuring form of calcium carbonate. It is used as building materials and also for manufacture of other building materials such as portland cement. It is used for the production of quickline and slaked lime which have wide applications in chemical, metallugical and construction industry. The pure CaCO_(3) , called precipitated calcium carbonate, is used extensively as filler, providing bulk to materials such as paint, plastics, printing links and rubber. it is also used in toothpastes, cosmetics and antacids. Quicklime and slaked lime are the cheapest and the most widely used bases for neutralising unwanted acids. Lime is used to neutralise acidic soils. An important application of quicklime is in air pollution control for the removal of SO_(2) in electric power plants. slaked lime is used in the manufature of other alkalis and bleacing powder, in sugar refinig, in tanning hide and in water softening. Chemical compound (A) is used to remove temporary hardness from water. It reacts with Na_(2)CO_(3) to generated caustic soda. when CO_(2) is passed through (A) it turns cloudy. What is (A) ?

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NARAYNA-METTALURGY-Single Answer Questions
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  3. When the ore haematite is burnt in air with coke around 2000 K along w...

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  4. In the commercial electrochemical process for aluminium extraction, th...

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  5. In the elactrolytic extraction of aluminium, cryolite is used.

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  9. In the metallurgy of iron, when limestone is added to the blast furnac...

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  11. Identify the metal M whose extraction is based on the following reacti...

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  15. Which ore contains both iron and copper?

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  18. Black tin is

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