Chemistry Class 12

Which among the following will show anisotropy ?

• Glass

• NaBr

• Plastic

• Rubber

Which of the solids show the following properties ?

1. Electrical conductivity

2.Malleability

3.Ductility

4.Fairly high melting point

• Ionic solids

• Covalent solids

• Metallic solids

• Molecular solids

Which of the following forms a molecular solid when solidified ?

• Calcium fluoride

• Silicon dioxide

• Carbon dioxide

• Sodium chloride

Which type of crystals contain more than one bravais lattice ?

• Hexagonal

• Triclinic

• Rhombohedral

• Monoclinic

A compound is formed by 2 elements Y and Z . The element Z forms ccp and atoms Y occupies 1/3^rd of tetrahedral voids . The formula of the compound is

• Y₂Z₃

• YZ

• YZ₃

• Y₂Z

The coordination number of metal crystallising in a hexagonal close packing is

• 12

• 4

• 8

• 6

Edge length of unit cell of chromium metal is 287 pm with bcc arrangement . The atomic radius is of the order

• 124.27 pm

• 287 pm

• 574 pm

• 143.5 pm

Copper crystalises in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?

• 157 pm

• 181 pm

• 127 pm

• 108 pm

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 ?

• 3.89 g cm^-3

• 2.16 g cm^-3

• 8.117 g cm^-3

• 400 g cm^-3

The density of a metal which crystllises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be

• 10 g cm^-3

• 14.2 g cm^-3

• 6.15 g cm^-3

• 9.32 g cm^-3