Question

Assertion (A) : Graphite is an example of tetragonal crystal system.
Reason (R ) : For a tetragonal system, `a = b != c` and `alpha = beta = 90^(@), gamma = 120^(@)`.
A. if both (A) and ® are correct , and ® is correct explanartion of (A
B. if both (A) and ® are correct , but ® is nmot the correct explanation of
C. if (A) is correct , but ® is incorrect.
D. if both (A) and ® are icorrect .

Answer 1

Correct Answer - D
Correct(A): Graphite is an example of (a). Crystal system in which each C-atom is `sp^(2)` hybridized and is linked to three other C-atom in a hexagonal planr structure.
Correct (R): For tetragonal system, `a=bcancel=c` and `alpha=beta=gamma=90^(@)`. for hexagonal systems. `a=bcancel=c` and `alpha=beta=90^(@),gamma=120^(@)`