Solid State Question 4
Question: Which of the following is correct
[DPMT 1997]
Options:
A) Crystal system Axial distance Axial angles Examples Cubic $ a\ne ~b=c $ $ \alpha =\beta \ne \gamma =90{}^\circ $ $ Cu,KCl $
B) Crystal system Axial distance Axial angles Examples Monoclinic $ a\ne ~b=c $ $ \alpha =\beta =\gamma =90{}^\circ $ $ PbCrO_2,PbCrO_4 $
C) Crystal system Axial distance Axial angles Examples Rhombohedral $ a=~b=c $ $ \alpha =\beta =\gamma \ne 90{}^\circ $ $ CaCO_3,HgS $
D) Crystal system Axial distance Axial angles Examples Triclinic $ a=~b=c $ $ \alpha \ne \beta =\gamma \ne 90{}^\circ $ $ K_2Cr_2O_7,CuSO_4.5H_2O $
Show Answer
Answer:
Correct Answer: C
Solution:
Rhombohedral crystal system $ a=b=c $ , $ \alpha =\beta =\gamma \ne 90^{o} $ ex - $ NaNO_3 $ , $ CaSO_4 $ , calcite $ CaCO_3 $ , $ HgS $
BETA
