4. Lamp black, soot and kajal all are same.
5. Adsorption is a surface phenomenon.
6. The word “graphite' comes from a greek word meaning 'to write”.
7. Charcoal has higher calorific value than wood.
8. Charcoal is a good adsorbent. true or false
Answers
Answer:
4. Kajal or soot is the other name for lamp black. Lamp black is an amorphous form of carbon which is obtained by the pyrolysis of hydrocarbons.
5. Adsorption is a mass transfer process that is a phenomenon of sorption of gases or solutes by solid or liquid surfaces. The adsorption on the solid surface is that the molecules or atoms on the solid surface have residual surface energy due to unbalanced forces.
6. The word 'graphite' comes from a Greek word meaning 'to write'. The lead in our writing pencils is graphite mixed with clay. Graphite is also known as black lead or plumbago. Graphite is also crystallized carbon.
7. Charcoal has a higher calorific value than wood. Calorific value of charcoal is 33 Kilojoules per gram whereas that of woos is 17 kilojoules per gram.
8. Coke is obtained by destructive distillation of sugar. Activated charcoal is a good conductor of electricity.
Explanation:
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