Tag: chemistry

Pure alumina melts at about $2000^oC$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at $900^0C$ and $Al _2O _3$ becomes a good conductor of electricity.

As a natural product, cotton is completely biodegradable, which means that it breaks down when put into a composting pile or bin. Because of cotton's biodegradable properties, all-cotton clothing can also be recycled and used in the manufacture of useful materials, such as household insulation

Plastics is not environment friendly because it is non biodegradable and on burning it leaves poisonous gases.
Option D is correct.

These numbers are used to indicate whether the plastic can be recycled into new products or not.

Plastic is non biodegradable and also it take several thousands of years and also on burning it leave many poisonous gases.
Option D is correct.

Non-Biodegradable wastes cannot be recycled and they give out toxic substances and pollute the surroundings.

Plastic recycling is the process of recovering scrap or waste plastic and reprocessing the material into useful products, sometimes completely different in form from their original state.

Cotton is a natural fibre. It consists of natural components. . It is a renewable resource, the production requires little energy, Cotton takes 2 to 5 months to decompose.

Biodegradable compounds are compounds which get disposed through natural processes, such as action of bacteria. e.g peels of fruits, vegetables, paper.