Why do ionic compounds tend to be hard and brittle?
What isReason of Ionic solids are hard and brittle ?
What is Difference between crystalline and amorphous solids with one example of each.
Give the significance of a lattice point.
What type of solids are electrical conductors, malleable and ductile?
What is Amorphous solids ?
WHat is Crystalline solids ?
Why do solids have a definite volume?
Why are solids rigid?
Why is glass considered a super cooled liquid?
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?
Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.
Solid A is very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
In a p-type semiconductor the current is said to move through holes.Explain.
What is Metal Deficiency Defects ?
What is Metal Excess Defects?
What is Non – Stoichiometric Defects ?
What is Interstitial Defect ?
What is Vacancy Defect ?
What is Stoichiometry Defects ?
What is Atomic Imperfections or Point Defects ?
What is H-center defects ?
What is F-center defects
The Frenkel Defect
Explain The Schottky Defect
Which type of defects are known as thermodynamic defects?
Name one solid in which both Frenkel and Schottky defects occur.
Why is Br(V) a stronger oxidant than Sb (V)?
hy is the froth flotation method selected for the concentration of sulphide ores
Define the term ‘Tyndall effect’.
Which point defect in ionic crystal does not alter the density of the relevant solid?
What makes the crystal of KCl sometimes appear violet?
Name the crystal defect which lowers the density of an ionic crystal.
Why does conductivity of silicon increase with the rise in temperature
What is ‘doping’ ?
Which point defect is observed in a crystal when a vacancy is created by an atom missing from a lattice site.
Why is Frenkel defect not found in pure alkali metal halides?
In Corundum, O2– ions from hcp and Al3+ occupy two third of octahedral voids. Determine the formula of corundum.
In NaCl crystal, Cl– ions form the cubic close packing. What sites are occupied by Na+ ions.
An element crystallises separately both in hcp and ccp structure. Will the two structures have the same density? Justify your answer
How much space is empty in a hexagonal closed packed solid?
Arrange simple cubic, bcc and fcc lattice in decreasing order of the fractionof the unoccupied space.
How many octahedral voids are there in 1 mole of a compound having cubic closed packed structure?
In an examination of a school having 60 students in XII A and 40 students in XII B, 15 and 20 students failed in XII A and XII B, respectively. A student is called by the principal at random, find the probability that he is from XII A if he passed in the examination.
What is the coordination number for (a) an octahedral void (b) a tetrahedral void.
If the formula of a compound is A2B, which sites would be occupied by A ions?
What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
what is voids in chemistry
Define the term 'crystal lattice.’
Why glass is regarded as an amorphous solid?