Chemistry Question Bank

Assertion : If three elements A, B and C crystallize in a cubic solid lattice with A atoms at the corners, B atoms at the cube centre and C atoms at the centre of the faces of the cube, then the formula of the compoun…

Assertion : In caesium chloride structure, Cl⁻ ions are at the corners of a primitive cubic array and Cs⁺ ions fits into big central empty region in each Cl⁻ array. Reason : The radius ratio r Cs r Cl is greater than …

Example of unit cell with crystallographic dimensions , 90º, 90º a b c is

Assertion : If density of CsCl (cubic structure) is 3.99 g/cm3, the distance between Cs⁺ and Cl⁻ ions will be 357 pm [atomic mass of Cs = 133]. Reason : CsCl has bcc lattice.

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 unit cell of a binary alloy composed of A and B metals, has ccp. Structure with A atoms occupying the corners and B atoms occupying centres of each face of the cube. If during the crystallisation of this alloy, in…

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is

Number of unit cells in 4 g of X (atomic mass=40). Which crystallises in bcc pattern is (NA=Avogadro number)

Assertion : Graphite is an example of tetragonal crystal system. Reason : For a tetragonal system, a = b c, α = β = γ = 90º.

A sample of electrically neutral NaCl crystal is analysed for its density which has some unoccupied sites. Two readings where taken.

A metallic element has a cubic lattice. Each edge of the unit cell is 2 Å. The density of the metal is 2.5 g cm–3 . The unit cells in 200 g of the metal are

A compound contains two types of atoms X and Y. It crystallises in a cubic lattice with atoms X at the corners of the unit cell and atoms Y at the body centre. The simplest possible formula of this compound is

Ag crystallises as fcc. If radius of Ag is 144 pm then its density will be (a)₁₀ g cm–3

In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners and face centres of the cubic unit cell but all the face-centred atoms along one of the axes are removed and ‘B’ atoms occupy octahedral voids, t…

Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å. The radius of sodium atom is approximately:

Total volume of atoms present in a face centred cubic unit cell of a metal is (r = radius of atom) (a) r (b) r (c) r (d) r

Density of NaCl crystal by not considering the unoccupied sites but only the occupied sites = 2.165 × 103 kg m–3. The percentage of unoccupied sites in NaCl crystal is

In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

Density of NaCl crystal assuming all sites are occupied = 2.178 × 103 kg m–3

Which of the following is/are correct pair(s) regarding diagonally related elements?

Which of the following statements(s) is/are incorrect regarding the s-block elements? I. Francium is highly radioactive element. II. Oxides and hydroxides of alkali metals and alkaline earth metals are not alkaline in…

On moving top to bottom among a group the correct trend of hydration enthalpies for alkali metal ions is

What will be the oxidation state of nitrogen and alkali metal when the nitrogen and alkali metal react with each other?

Hydrogen carbonate of lithium doesn’t exist in solid state due to

[X] and [Y] are two nitrates of alkali metals [X] and [Y] on decomposition produces oxides and nitrites respectively. Here, [X] and [Y] refer to