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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता ७ वी

Give reason. An iron article should be given a coat of paint - General Science

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प्रश्न

Give reason.

An iron article should be given a coat of paint

कारण सांगा
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उत्तर

Iron articles often undergo rusting, resulting in the formation of a reddish-brown layer on their surface. Rusting is caused by the exposure of iron to the air and water in the surroundings. An iron article that is coated with paint prevents the interaction of iron with the surrounding air and water and thus protects it from rusting.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 13: Changes – Physical and Chemical - Exercise [पृष्ठ ९१]

APPEARS IN

बालभारती General Science [English] Standard 7 Maharashtra State Board
पाठ 13 Changes – Physical and Chemical
Exercise | Q 3.2 | पृष्ठ ९१
बालभारती General Science Integrated [English] Standard 7 Maharashtra State Board
पाठ 13 Changes – Physical and Chemical
Exercise | Q 3. (b) | पृष्ठ ८५

संबंधित प्रश्‍न

Why do we apply paint on iron articles?


Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.


What are the constituents of stainless steel?


Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.


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.


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

Graphite is a lustrous non-metal which conducts electricity.


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


Complete flow chart given below.


Write a molecular formula for rust.


Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?


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