12th Standard Syllabus & Materials

12th Standard

TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

creative two marks questions in +2 chemistry english medium state board chapter one

Published on: 28/06/2019

creative two marks

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 12th Standard - Chemistry

chapter: - Model Question paper

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Questions:

Generic 2

10 x 2 = 20

Name the various refining process.

Name the metals that are obtained from their oxides using hydrogen as reducing agent.

Name some reducing agents used to convert Metal oxides to metal

Name the two steps involved in the extraction of crude metal

Name some common methods of ore concentration.

Can the same method of extraction be used for all metals.

What is meant by concentration?

Name some elements that occur as native elements.

Why should we have a ecofriendly metallurgical process?

10.

What is metallurgy?

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Answers Key:

Generic 2

10 x 2 = 20

Distillation, liquation, electrolytic refining, zone refining, vapour phase method, van -Arkel method

Iron, Lead and Copper

Metal oxides to metal : Carbon, carbon monoxide, hydrogen, aluminum and metals like sodium.

(i) Conversion of ores into oxides.
(ii) Reduction of metal oxides.

Gravity separation, froth flotation, leaching, magnetic separation

The choice of method will depend on the nature of the ore, type of impurity and environmental factors

The preliminary step in metallurgical process is removal of the impurities. This removal process is known as concentration of ore.

Copper, Silver, Gold and Platinum

It is essential to design an eco friendly metallurgical process that would minimize waste, maximize energy efficiency. Such advances in metallurgy is vital for the economic and technical progress in the current era.

10.

Metallurgy relates to the science and technology of metals. The various steps involved in the extraction of metals form their ores as well as refining of crude metals are collectively know as metallurgy.