Advertisements
Advertisements
प्रश्न
Choose the correct alternative and rewrite the following:
Iron is _____________________.
विकल्प
More reactive than Zn.
more reactive than Al.
less reactive than Cu.
less reactive than Al.
उत्तर
less reactive than Al
APPEARS IN
संबंधित प्रश्न
Give reasons:
Platinum, gold and silver are used to make jewellery.
What is anodising? Give its applications.
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.
The chemical reaction involved in the corrosion of iron metal is that of:
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement
In one method of rust prevention, the iron is not coated with anything. Which is this method?
Why is an iron grill painted frequently?
A common metal which is highly resistant to corrosion is:
(a) iron
(b) copper
(c) aluminium
(d) magnesium
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.
Corrosion can be an advantage in some case.Explain ?
Find the odd man out:
Write three methods of preventing rusting of iron.
Give a reason why rust turns moist red litmus blue.
_______ forms a green colour in the water.
Bronze : _______ : : Stainless steel : Fe + Cr + C
What is rust?
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?
Gold plated ornaments is the example of ______.
