Question

Column-I and Column-II contains four entries each. Entries of Column-I are to be matched with some entries of Column-II. One or more than one entries of Column-I may have the matching with the same entries of Column-II.

List -I	List -I
(i) Tetragonal and hexagonal	(P) $a=b\ne c$
(ii) Cubic and Rhombohedral	(Q) $\alpha =\beta =\gamma$
(iii) Monoclinic and triclinic	(R) $a\ne b\ne c$
(iv) Orthorhombic	(S) $a=b=c$

Which of the following option has the correct combination considering List-I and List-II

• A. $i-S$
• B. $ii-P$
• C. $iii-Q$
• D. $iv-R$

Answer 1

The correct option is D $iv-R$

Crystal system	Edge length	Crystal angle
Tetragonal	$a=b\ne c$	$\alpha =\beta =\gamma ={90}^o$
Hexagonal	$a=b\ne c$	$\alpha =\beta ={90}^o,\gamma ={120}^o$
Cubic	$a=b=c$	$\alpha =\beta =\gamma ={90}^o$
Rhombohedral	$a=b=c$	$\alpha =\beta =\gamma ={90}^o$
Monoclinic	$a\ne b\ne c$	$\alpha =\gamma \ne {90}^o,\beta \ne {90}^o$
Triclinic	$a\ne b\ne c$	$\alpha \ne \beta \ne \gamma \ne {90}^o$
Orthorhombic	$a\ne b\ne c$	$\alpha \ne \beta \ne \gamma \ne {90}^o$