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Diamond is the hardest naturally occurring substance found on Earth. But it is not the hardest substance. Wurtzite boron nitride (synthetic) and lonsdaleite (which comes from meteorites) are both harder.

Activated charcoal is a very good adsorbent. It can easily adsorb large volumes of gases easily. Hence it is used in gas masks to adsorb harmfull gases. It cannot adsorb oxygen which makes it perfect for gas masks.

Modern refrigerators usually use a refrigerant called HFC-134a (1,1,1,2-Tetrafluoroethane), which does not deplete the ozone layer, instead of Freon. A R-134a is now becoming very uncommon in Europe. Newer refrigerants are being used instead.

The Carius halogen method in analytical chemistry is a method for the quantitative determination of halogens in chemical substances. A known mass of an organic compound is heated with fuming nitric acid in the presence of silver nitrate contained in a hard glass tube known as carius tube, in a furnace.

The lead does not react with dilute sulphuric acid.

Sodium palmitate is the sodium salt of palmitic acid, a component in hard soaps. Palmitic acid is a common saturated fatty acid and produced during fatty acid synthesis.

Parasites An organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other’s expense.

Phototropism is the growth of an organism in response to a light stimulus. Phototropism is most often observed in plants, but can also occur in other organisms such as fungi.

Dementia A group of thinking and social symptoms that interferes with daily functioning.

The strongest bone in the human body – Jawbone
The largest bone in human body – Thigh bone
The stapes is the smallest bone.
Osteology is the study of bone.
The human body has a total of 206 bones.

No. of bones in the vertibral column of the human body – 33

No. of bones in ribs – 24

The main purpose of a thermos flask is to prevent the flow of heat to and from the flask. The inner chamber of the flask is made up of glass, which is a poor conductor of heat.

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