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Q.

Crystals, in which the sides are not equal to each other, the angles are  equal to 900 are/is

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a

CuSO4.5H2O

b

Na2SO4.10H2O

c

K2Cr2O7

d

BaSO4

answer is A, D.

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Detailed Solution

CuSO4.5H2O   ortho rhombic 

K2Cr2O7                triclinic

Na2SO4.10H2O  monoclinic

BaSO4              ortho rhombic

Crystal systemAxial lengthAxial angles
Cube a=b=cα=β=γ=900
Tetragonala=bcα=β=γ=900
Orthorhombicabcα=β=γ=900
Monoclinicabcα=β=900γ
Triclinicabcαβγ900
Trigonala=b=cα=β=γ<1200 ,900
Hexagonala=bcα=β=900;γ =1200
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