Diamond is harder than graphite.

Consider the following statements : 1. Diamond is hard and graphite is soft. 2. Diamond is soft and graphite is hard. 3. Diamond is a bad conductor but graphite is a good conductor . 4. Diamond is a good conductor but graphite is a bad conductor. Which of the statements given above is/are correct ?

Diamond is more stable than graphite at room temperature and pressure.

Assertion (A) : Graphite is chemically more reactive than diamond . Reason (R) : Diamond is very hard but fraphite si soof .

(A) Graphite is soft while diamond is hard. (R) Graphite has three dimensional structure while diamond has planar.

Why is diamond hard while graphite is soft?

Give reasons: (i) Graphite is used as a lubricant. (ii) Diamond is used as an abrasive.