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BMA Class 8 Chemistry Carbon and its components

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_______ is the hardest known natural substance.

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Hydrocarbons are the organic compounds that contain the elements ________________.

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In the refining of petroleum, in a fractionating column, the principle used is _______.

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_________ (Adsorption/Chemisorption) process is involved in the decolourisation of sugar cane juice.

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Coal, natural gas and petroleum are examples of _______ .

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The crystalline forms of carbon are diamond, graphite and ________.

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Kajal or soot is other name for _______.

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______, amorphous form of carbon is used as electrodes.

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On destructive distillation, coal gives coal tar, coal gas, ammonical liqour and _________ . (coke/gasoline)

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_________ (Bio/Ethane) gas can be generated from waste materials which is rich in methane.

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LPG is ___________ .

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A fuel should have high ________ (1. Calorific / 2. Octane) value.

Write your answer in form of 1 or 2

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__________ is the substance which reacts with oxygen and burns to release energy.

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Natural gas is primarily ______ .

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Coke floats on water when dissolved, this is due to the presence of air _____ in it.

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The density of coal is _______ when compared to coke.

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________ bacteria are microbes that work in the absence of oxygen.

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__________ is widely used as fuel in factories and thermal power stations.

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The residue from biogas plant serves as _______manure.

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________ charcoal is the purest form of carbon.

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Weight of diamonds are measured in________.

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The property of an element, existing in various physical forms is called _______ .

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________ is slippery to touch, hence used as a lubricant.

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Which of the following is a purest form of charcoal?

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The isotope of carbon used in carbon dating is carbon- _____.

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Match the following

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Brain Nurtures

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