## Mathematical analysis of cubic system and Bragg’s equation MCQ Basic Level

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. If an atom is present in the centre of the cube, the participation of that atom per unit cell is

•  1/4
•  1
•  1/2
•  1/8

1

Q2. For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be

•  Greater than 0.73
•  In between 0.73 and 0.41
•  In between 0.41 and 0.22
•  Less than 0.22

In between 0.73 and 0.41

Q3. The number of spheres contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is

•  In (i) 2 and in (ii) 4
•  In (i) 3 and in (ii) 2
•  In (i) 4 and in (ii) 2
•  In (i) 2 and in (ii) 3

In (i) 2 and in (ii) 4

Q4. In octahedral holes (voids)

•  A simple triangular void surrounded by four spheres
•  A bi-triangular void surrounded by four spheres
•  A bi-triangular void surrounded by six spheres
•  A bi-triangular void surrounded by eight spheres

A bi-triangular void surrounded by six spheres

Q5. In the crystals of which of the following ionic compounds would you expect maximum distance between centres of cations and anions

•  LiF
•  CsF
•  CsI
•  LiI

CsI

Q6. In the Bragg’s equation for diffraction of X-rays, n represents for

•  Quantum number
•  An integer
•  Moles

An integer

Q7. In a face centred cubic cell, an atom at the face contributes to the unit cell

•  1/4 part
•  1/8 part
•  1 part
•  1/2 part

1/8 part

Q8. For an ionic crystal of the type AB the value of (limiting) radius ratio is 0.40. The value suggests that the crystal structure should be

•  Octahedral
•  Tetrahedral
•  Square planar
•  Plane triangle

Tetrahedral

Q9. The number of atoms/molecules contained in one face centred cubic unit cell of a monoatomic substance is

•  1
•  2
•  4
•  6

4

Q10. The number of atoms/molecules contained in one body centered cubic unit cell is

•  1
•  2
•  4
•  6

2

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