Question

Match List - I with List - II 

List - I (Crystal System)	Symmetry Elements
A. Monoclinic	IV. 1 diad
B. Tetragonal	III. 1 tetrad
C. Orthorhombic	II. 3 diads
D. Cubic	I. 4 triads

• A. A-III, B-I, C-IV, D-II
• B. A-I, B-III, C-II, D-IV
• C. A-II, B-III, C-IV, D-I
• D. A-IV, B-III, C-II, D-I

Hint:

Monoclinic has 1 diad, orthorhombic has 3 diads, tetragonal has 1 tetrad, and cubic has 4 triads.

Answer 1

The Correct Option is D

Concept:
Crystal systems are identified by their symmetry axes. Diad means two-fold axis, tetrad means four-fold axis, and triad means three-fold axis.

Step 1: Match Monoclinic.
Monoclinic crystal system has one diad axis. \[ A\rightarrow IV \]

Step 2: Match Tetragonal.
Tetragonal crystal system has one tetrad axis. \[ B\rightarrow III \]

Step 3: Match Orthorhombic.
Orthorhombic crystal system has three diad axes. \[ C\rightarrow II \]

Step 4: Match Cubic.
Cubic crystal system has four triad axes. \[ D\rightarrow I \] Therefore, the correct matching is: \[ A-IV,\ B-III,\ C-II,\ D-I \] \[ \therefore \text{Correct Answer is (D)} \]