## Topic: Solid State, Test No.: 03, Total MCQs: 10

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Question 1 |

**A metal has a fcc lattice. The edge length of the unit cell is
404 pm. The density of the metal is 2.72 g cm**^{–3}**. The molar mass of
the metal is**

**(N**_{A}** Avogadro's constant = 6.02 × 10**^{23}** mol**^{–1}**) ****[NEET 2013]**

40 g mol ^{–1} | |

30 g mol ^{–1} | |

27 g mol ^{–1} | |

20 g mol ^{–1} |

Question 2 |

**A compound formed by elements A and B crystallizes in the cubic structure where A atoms are at the corners of the cube and B atoms are at the face centres. The formula of the compound is**

AB _{3} | |

AB | |

A _{3}B | |

A _{2}B_{2} |

Question 3 |

**A metallic crystal having bcc type staking pattern, what percentage of volume of this lattice is empty space?**

68% | |

32% | |

26% | |

74% |

Question 4 |

**A p-type material is electrically**

positive | |

negative | |

neutral | |

depends upon the concentration of p-impurities |

Question 5 |

**A solid compound contains X, Y and Z atoms in a cubic lattice with X atoms occupying the corners, Y atoms in the body centred position and Z atoms at the centres of faces of the unit cell. What is the empirical formula of the compound?**

XY _{2}Z_{3} | |

XYZ _{3} | |

X _{2}Y_{2}Z_{3} | |

X _{8}YZ_{6} |

Question 6 |

**A substance A**

_{x}B_{y}crystallizes in a face centred cubic (fcc) lattice in which atoms 'a' occupy each corner of the cube and atoms ‘B’ occupy the centres of each face of the cube. Identify the correct composition of the substance A_{x}B_{y}:AB _{3} | |

A _{4}B_{3} | |

A _{3}B | |

Composition cannot be specified |

Question 7 |

**A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?**

1.2 g/cm ^{3} | |

2.16 g/cm ^{3} | |

3.64 g/cm ^{3} | |

4.56 g/cm ^{3} |

Question 8 |

**AB is an ionic solid. If the ratio of ionic radii of A**

^{+}and B^{–}is 0.52. What is the coordination number of B^{–}?6 | |

3 | |

2 | |

8 |

Question 9 |

**For a crystal, the angle of diffraction (2θ) is 90° and the second order line has a d value of 2.28Å. The wavelength (in Å) of X-rays used for Bragg's diffraction is**

2.28 | |

2.00 | |

1.613 | |

4.00 |

Question 10 |

**If AgI crystallizes in zinc blende structure with I**

^{-}**ions at lattice points, what fraction of tetrahedral voids is occupied by Ag**

^{+}ions?25% | |

50% | |

100% | |

75% |

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