In a crystalline solid, some point defects is observed when a vacancy is created by an ion missing from its normal position . What is the name of the defects?

In crystalline solid, atoms, ions or molecules are held in an orderly array. But some point defect is observed in a crystal, when a vacancy is created by an atom or ion dislocated from its normal position to an interstitial site. What is the defect called?

A substance 'A' crystallizes in fcc lattice. In a crystalline solid AB, some vacancy is produced by missing of equal number of oppositely charged ions. What is the defect called?

A cubic crystalline solid contains A atoms at the comers and B atoms at the body centres. If one atom from a comer is missing, what will be the simplest formula of the resulting solid?

A bob of mass 0.1 kg hung from the ceiling of a room by a string 2 m long is set into oscilation. The speed of the bob at its mean position is 1 ms^(-1) . What is the trajectory of the bob if the string is cut when the bob is (a) at one of its extreme positions, (b) at its mean position.

Which point defect in its crystal units alter the density of a solid ?

What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?

What would happen to an artificial satellites, if its orbital velocity is slightly decreased due to some defects in it?

Names of some minerals are given below. .i) Haematite ii) bauxite iii) Dolomite a. Identify the mineral of Iron (Fe) b. Name the reducing agent mainly used in the extraction of iron from its ore. c. What is the role of powdered lime stone in the extraction process of iron?