# NEET Chemistry The Solid State Questions Solved

BOARD

(i) (a) Following is the schematic alignment of magnetic moments :    (5 marks)

What type of magnetism is shown by this substance ?

(b) What type of stoichiometric defect is shown by (i) KCl (ii) AgCl ?

(ii) An element with density 11.2 g cm–3 forms a fcc lattice with edge

length of 4 10–8 cm. Calculate the atomic mass of the element.

(NA = 6.02 1023 mol–1)

Concept Videos :-

#9 | FCC Unit Cell: Packing Fraction
#20 | Rank of HP Unit Cell
#21 | Packing Fraction of HP Unit Cell
#24 | Density of Unit Cell

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors

(i) a) Antiferromagnetism                                                (1 mark)

(b) i) Schottky defect          ii) Frenkel Defect                    (1/2 +1/2 marks)

(ii) $\mathrm{d}=\frac{\mathrm{zM}}{{\mathrm{a}}^{3}\mathrm{Na}}$                                                                   (1/2 mark)

z=4                                                                        (1/2 mark)

$11.2=\frac{4×\mathrm{M}}{\left(4×{10}^{-8}{\right)}^{3}×\left(6.02×{10}^{23}\right)}$                                      (1/2 mark)

M=107.9 g/mol                                                         (1 mark)

Atomic mass= 107.9 u                                                (1/2 mark)

Difficulty Level:

• 45%
• 50%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 24, 2019)