JEE Main 2014 · 12 Apr · Shift 1 · Chemistry Q39

← JEE Main 2014 · 12 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 39 of 90

In a monoclinic unit cell, the relation of sides and angles are respectively :

a=b\ne c

and

\alpha=\beta=\gamma=90^\circ

a\ne b\ne c

and

\alpha=\beta=\gamma=90^\circ

a\ne b\ne c

and

\beta=\gamma=90^\circ\ne\alpha

a\ne b\ne c

and

\alpha\ne\beta\ne\gamma\ne90^\circ

Answer and worked solution

Official answer: C

A monoclinic cell has $a\ne b\ne c$ with two angles of 90° and one not. Option (3), $\beta=\gamma=90^\circ\ne\alpha$ , has this form. (The usual convention writes $\alpha=\gamma=90^\circ\ne\beta$ , which is the same cell with the axes relabelled.)

Topics:Crystal lattices and unit cells

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JEE Main 2014 · 12 Apr · Shift 1, Chemistry question 39