## Solid State Quiz-7

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

Q1. The first order reflection (n=1) from a crystal of the X-ray from a copper anode tube (Î»=1.54 â„«)
occurs at an angle of 45°. What is the distance between the set of plane causing the diffraction?
•  0.1089 nm
•  0.1089 m
•  0.905 â„«
•  1.089nm
Solution
nÎ»=2d sinÎ¸
1×1.54 = 2d sin45°
1×1.54 = 2d × 0.850
2d=1.54/0.850
=0.905 â„«

Q2.In a face centred cubic arrangement off A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centres. One of the A atom is missing from one corner in unit cell. The simplest formula of compound is :
•
•
•
•
Solution
No. of atoms of A from corners of unit cell =7 ×1/8=7/8
No. of atoms of B from faces of unit cell = 6 ×1/2=3
Thus, A :B : :7/8 :3 or 7 :24
Thus, formula is

Q3.  For which crystal anion-anion contact is valid?
•   NaF
•  NaI
•  CsBr
•  KCl
Solution
Due to smaller size of F.

Q4. A solid metal has ccp or fcc structure. The relation of side of cube (a)and radius of atom (r) will be
•  a=2r
•  a=2√2r
•  a=4r/√3
•  √(3r/2)
Solution
In case of ccp or fcc structure 4r=√2a
⇒ a=4r/√2
∴ a=2√2r

Q5. The number of atoms present in a simple cubic unit cell are :
•  4
•  3
•  2
•  1
Solution
The number of atoms present in sc, fcc and bcc unit cell are 1, 4, 2 respectively.

Q6. The packing efficiency of the two dimensional square unit cell shown below is
•  39.27%
•  68.02%
•  74.05%
•  78.54%
Solution

Q7. All the substances becomes diamagnetic at :
•  4 K
•  10 K
•  20 K
•  25 K
Solution
Most of the metals have their transition temperature (i.e., the temperature at which a substance starts to behave as super conductor) in the range of 2-5 K. .

Q8.For a covalent solid, the units which occupy lattice points are :
•  Atoms
•  TIons
•  Molecules
•  Electrons
Solution
In covalent molecules atoms occupy the lattice points.

Q9.If ‘a’ stands for the edge length of the cubic systems : simple cubic, body-centred cubic and
face-centered, then the ratio of radii of the spheres in these systems will be respectively:
•
•
•
•
Solution
Q10. In NaCl crystal each  ion is surrounded by
•  4ions
•  6ions
•  1ion
• 2ions
Solution
In NaCl crystal, ions adopt cubic close packed arrangement and  ions occupy all the octahedral sites. Therefore, Na and Cl have 1 : 1 stoichiometry. In other words, each  ion is surrounded by six ions which are disposed towards the corners of a regular octahedron. Similarly, each  ion is surrounded by six  ions.

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