A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbes of P and Q?

A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the corners of the cube and B atoms at the centre of the cube. What is the formula of the compound?

Three elements PQR crystallise in a cubic type lattice with P atoms at the corner Q atoms at the cubic centre and R atoms at the edge centre. Calculate the formula of the compound.

In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms are at the face centres. One of the A atom is missing from one corner in the unit cell. What will be the result our formula of the compound formed?

What is the HCF and LCM of two prime numbers p and q?