Chemistry Question Bank

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are [NEET 2021]

Which type of defect present in NaCl ? (JIPMER 2019)

A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be :

The number of tetrahedral and octahedral voids in a CCP array of 100 atoms are respectively (Kerala CEE 2014)

Which of the following does not show electrical conduction in its physical state ? (CBSE AIPMT 2013)

Which one of the following is a molecular crystal?

Schottky defect in crystals is observed when (RPMT 2010)

The property of crystalline solid is not (OJEE 2010)

Assertion No compound has both Schottky and Frenkel defects. Reason Both defects change the density of the solid. [AIIMS 2008]

Electrons in a paramagnetic compound are

Those substances which show permanent magnetism even in the absence of magnetic field are called

On the basis of their magnetic properties, substances can be classified into …A… categories. Here, A refers to

Identify the incorrect statement.

Doping of silicon (Si) with boron (B) leads to

Which of the following has the highest value of energy gap?

If we mix pentavalent impurity in a crystal lattice of germanium then what type of semiconductor formation will occur?

…A… and …B… are the examples of intrinsic semiconductors. Here, A and B refer to

In case of semiconductors, the gap between the valence band and conduction band is …A… Here, A refers to

Insulators are the solids with very low conductivities ranging between …A… Here, A refers to

Types of point defects are

In a Schottky defect,

The structure of MgO is similar to NaCl. What would be the coordination number of magnesium.

How many chloride ions are there around sodium ion in sodium chloride crystal.

For the structure given below the site marked as S is a

Which of the following statements is not true about the voids?