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Question
Complete flow chart given below.
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Solution
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Which of the following methods is suitable for preventing an iron frying pan from rusting?
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Platinum, gold and silver are used to make jewellery.
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Choose the correct answer from the options given below:
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as
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B. Ore-dressing
C. Calcination
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Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.
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Name an alloy of copper. State its chemical composition and any one use.
A common metal which is highly resistant to corrosion is ______.
In stainless steel alloy, iron metal is mixed with ______.
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No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.
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A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells.
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Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?
State under what conditions corrosion is faster ?
Compare roasting and calcination.
No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.
(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.
(ii) Mention any two types of reactions under which above chemical reaction can be classified.
What are the adverse effects of corrosion?
Give reason.
A wooden article should be polished.
Give reason.
Copper and brass utensils should be tinned.
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Graphite is a lustrous non-metal which conducts electricity.
Observe the following picture and answer the following questions:
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- Write the chemical formula of rust.
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_______ is an alloy made from iron, carbon and chromium.
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To prevent corrosion of iron and steel _______ method is used.
_______ forms a green colour in the water.
When one of the metals in an alloy is mercury the alloy is called _______.
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Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
