Question

Class 10ChemistryCarbon and Its Compounds

For question two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:

  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.

Assertion: Diamond and graphite do not have the same crystalline structure.

Reason: Diamond is crystalline while graphite is amorphous.

Verified Answer

(c) A is true, but R is false.

Explanation:

In diamond, each C-atom is bonded to four other ‘C’ atoms and form rigid 3-D structure while, in graphite each ‘C’ atom is bonded to three other ‘C’ atoms in hexagonal array & form layer one above the other.

Diamond and graphite both are crystalline forms of carbon.