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प्रश्न
What are the constituents of stainless steel?
उत्तर
The constituent elements present in stainless steel are iron, nickel and chromium.
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संबंधित प्रश्न
Give two examples of alloys with their chemical composition.
Explain the terms Corrosion
Give reasons:
Platinum, gold and silver are used to make jewellery.
What type of chemical reaction is involved in the corrosion of iron?
Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.
State two conditions for the rusting of iron.
In one method of rust prevention, the iron is not coated with anything. Which is this method?
What is corrosion?
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.
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.
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.
Choose the correct alternative and rewrite the following:
Iron is _____________________.
Give reason.
Copper and brass utensils should be tinned.
Which of the following method is used to prevent the accumulation of greenish layer on brass due to corrosion?
Rusting of iron : Fe2O3 : : corrosion of copper : ______
Draw a neat labelled diagram.
Electroplating
Draw a neat labelled diagram.
Anodizing
Complete flow chart given below.
What is rust?
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.
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?
