Assertion :There are seven types of crystal system and $14$ types of Bravais lattices. Reason: Rhombohedral, triclinic and hexagonal crystal systems have only primitive unit cell.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$C r y s t a l$ $S y s t e m$ $B r a v a i s$ $L a t t i c e$
1) Cubic Primitive, Face centered, Body centered
2) Orthorhombic Primitive, Face centered, Body centered, End centered
3) Tetragonal Primitive, Body centered
4) Monoclinic Primitive, End centered
5) Rhombohedral or Trigonal Primitive
6) Triclinic Primitive
7) Hexagonal Primitive

Total $7$ crystal system and $14$ Bravais Lattice.

Answer) $(B)$

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Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

Assertion: Be and Al have similar properties.

Reason: $B e^{2 +}$ and $A l^{3 +}$ have nearly the same charge/volume ratios and similar polarising power.

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