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Q. No.

A compound is formed by two elements A and B. The element B forms cubic close-packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is \(A_x B_y \) then the value of x+y is in option 
1.  2 
2.  5 
3.  4 
4.  3
Q1:
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Subtopic:  Density & Packing Fraction |
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What fraction of one edge centred octahedral void lies in one unit cell of fcc? 
1. \( 1 \over 12\) 2. \( 1 \over 2\)
3. \( 1 \over 3\) 4. \( 1 \over 4\)
Q2:
From NCERT NEET - 2023
Subtopic:  Voids, Radius Ratio & Coordination Number |
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How many number of tetrahedral voids are formed in 5 mol of a compound having cubic close packed structure? (Choose the correct option)
1. \(1.550 \times10^{24}\) 2. \(3.011 \times10^{25}\)
3. \(3.011 \times10^{24}\) 4. \(6.022 \times10^{24}\)
Q3:
From NCERT NEET - 2023
Subtopic:  Voids, Radius Ratio & Coordination Number |
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How are edge length 'a' of the unit cell and radius 'r' of the sphere related to each other in ccp structure?
(Choose correct option for your answer)
1. \(a = 2r\) 2. \(a = r /2\sqrt2\)
3. \(a = 4r /\sqrt3\) 4. \(a = 2\sqrt2r\)
Q4:
From NCERT NEET - 2023
Subtopic:  Density & Packing Fraction |
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Select the correct option based on statements below:
Assertion (A): In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason (R): In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
 
1. (A) is false but (R) is true.
2. Both (A) and (R) are true and (R) is the correct explanation of (A).
3. Both (A) and (R) are true but (R) is not the correct explanation of (A).
4. (A) is true but (R) is false.
Q5:
From NCERT NEET - 2022
Subtopic:  Imperfections in Solids & Semiconductors |
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Copper crystallises in fcc unit cell with a cell edge length of \(3.608 \times 10^{-8}\) cm. The density of copper is \(8.92 \ g ~cm^{-3}\). The atomic mass of copper is:

1. 65 u 
2. 63.1 u 
3. 31.55 u 
4. 60 u 
Q6:
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Subtopic:  Density & Packing Fraction |
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A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:

1. all the domains get oriented in the direction opposite to the direction of magnetic field.
2. domains are not affected by magnetic field.
3. domains get randomly oriented.
4. all the domains get oriented in the direction of magnetic field.


 

Q7:
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Subtopic:  Magnetic Behaviour of an Element/Compound |
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Which statements among the following is not correct?

1. When conduction band and valence band overlap, a semiconductor is obtained 
2. Ferrimagnetism arises due to the alignment of magnetic moments of the domains in the substance in parallel and anti-parallel directions in unequal numbers 
3. Replacing some silicon atoms by boron atoms in crystal of silicon produces p-type semiconductor 
4. Replacing some germanium atoms by phosphorus atoms in a crystal of germanium produces n-type semiconductor 
Q8:
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Subtopic:  Imperfections in Solids & Semiconductors |
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Match List-I with List-II :
List-I
(Defects)		 List-II
(shown by)
(a) Frenkel defect (i) non-ionic solids and density of the solid decreases.
(b) Schottky defect (ii) non-ionic solids and density of the solid increases.
(c) Vacancy   defect (iii) ionic solids and density of the solid decreases.
(d) Interstitial
      defect		 (iv) ionic solids and the density of the solid remains constant.
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (i) (ii) (iii) (iv)
2. (i) (iii) (ii) (iv)
3. (iv) (iii) (ii) (i)
4. (iv) (iii) (i) (ii)
Q9:
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The number of tetrahedral and octahedral voids in hexagonal primitive unit cell are respectively:

1. 2, 1

2. 12, 6

3. 8, 4

4. 6, 12

Q10:
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Subtopic:  Voids, Radius Ratio & Coordination Number |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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