हिंदी

Give Two Examples of Alloys with Their Chemical Composition. - Science and Technology 2

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प्रश्न

Give two examples of alloys with their chemical composition.

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उत्तर

Examples:

Name of the alloy Composition
Duralumin Al + Cu + Mg + Mn
Brass Cu + Zn
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2015-2016 (March)

संबंधित प्रश्न

What is an alloy?


Write two methods of preventing the rusting of iron.


What are alloys?


What type of chemical reaction is involved in the corrosion of iron?


 Name any two metals which do not corrode easily.


Name an alloy of copper. State its chemical composition and any one use.


 Name a common metal which is highly resistant to corrosion.


If copper is kept exposed to damp air for a considerable time, it gets a green coating on its surface. This is due to the formation of:
(a) hydrated copper sulphate
(b) copper oxide
(c) basic copper carbonate
(d) copper nitrate


Observe the following picture a write down the chemical reaction with the explanation.


Find the odd man out:


Choose the correct alternative and rewrite the following:

Iron is _____________________.


State whether the statement given below is true or false. If false write the correct statement.

Either oxygen or moisture is essential for rusting.


_______ is an alloy made from iron, carbon and chromium.


Which of the following method is used to prevent the accumulation of greenish layer on brass due to corrosion?


Corrosion of silver causes a black layer of _______.


Write scientific reason.

On exposure to air, silver articles turn blackish after some time.


Write scientific reason.

Coins are made from metals and alloys.


Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?


Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?


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