Materials like metals, glass and plastics are recycled to heat them to melt and mold them into new objects. Which of the following would make it impossible to recycle a material by melting?
a) If it changes into different substance on heating
b) If it breaks easily when a force is applied
c) If it melts only at very high temperatures
d) If it is non-biodegradable
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Answer:
If a substances changes into different substance on heating, it is impossible for this material to be recycled by melting.
Explanation:
Recycling : It is the process of reusing a substances after converting it into different form by application of heat. Recycling involves different steps such as sorting, shredding, heating, molding etc.
When a substance is changed into a different substance its chemical composition is altered and it may not be suitable for recycling or it may not cool down easily. The selection of materials for recycling depends upon the type of material, its chemical composition, melting point etc.
So, the correct option is A.
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