Solid carbon comes in different forms known as allotropes depending on the type of chemical bond. Graphite is one of the allotropes of carbon, it is mostly used for refractories, batteries, steelmaking, brake linings, foundry facings and lubricants.
1. Which of these is a greyish-black opaque allotrope of carbon?
(i) Diamond
(ii) Lead
(iii) Graphite
(iv) Gold
2. State true or false: Graphite is soft and slippery to touch.
(i) TRUE
(ii) FALSE
3. Which of the following is an allotrope of carbon which is colourless transparent substance having extraordinary brilliance?
(i) Iron
(ii) Steel
(iii) Gold
(iv) Diamond
4. State true or false: Graphite conduct electricity due to availability of free electron.
(i) FALSE
(ii) TRUE
5. Graphite is mixed with petroleum jelly to make which of the following compound(s)?
(i) Graphite powder
(ii) Graphite oil
(iii) Graphite grease
(iv) Graphite jelly
