Bihar Board Class 12 (Science) Solid State — practice questions
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Practice Bihar Board Class 12 (Science) Solid State in the app →The mole fraction of urea ($M = 60\,\text{g/mol}$) in an aqueous solution containing $6\,\text{g}$ of urea in For an ideal solution containing two volatile liquids A and B, Raoult's law gives the total vapour pressure asOsmotic pressure of a dilute solution is expressed by van't Hoff's equation as:Two solutions are said to be **isotonic** if they:If $\mathrm{NaCl}$ undergoes complete dissociation in water, the van't Hoff factor $i$ is:Desalination of sea water is best carried out by:The MOLARITY of a solution containing 58.5 g NaCl dissolved in 1 L of solution is:HENRY'S LAW states that at constant temperature:A MINIMUM-BOILING azeotrope arises from:Which of these is NOT a colligative property?Salt is sprinkled on icy roads in cold countries to:The van't Hoff factor (i) for sodium chloride (NaCl) in water is approximately:Which property marks crystalline solids but not amorphous ones?A solid has the same refractive index in all directions. Which one is it?Amorphous solids are often described as which of the following?The substances NaF and MgO show the same crystal structure and the same atomic ratio. They are called what?Calcite and aragonite are two crystalline forms of calcium carbonate. This phenomenon is called what?Polymorphism shown by an element, as in diamond, graphite and fullerene, is known by which name?Why are covalent network solids poor conductors of electricity?Which statement about ionic crystals is correct?When is an ionic solid such as NaCl a good conductor of electricity?What type of force holds the particles of an ionic crystal together?Which of the following forms a molecular crystal on solidification?Why are molecular solids usually soft with low melting points?Solid CH4 and solid H2 are held together by which forces?Metallic crystals are often described as an array of positive ions in what?A metal can be drawn into wires. This property is called what?The constituent particles attached to each lattice point of a crystal are collectively called what?In a primitive unit cell, where are the constituent particles located?A unit cell that has particles at the corners and one at the centre of the body is called what?A base-centred unit cell has particles at the corners and where else?How many distinct space lattices (Bravais lattices) are possible in three dimensions?The fourteen Bravais lattices are grouped into how many crystal systems?How many Bravais lattices belong to the cubic crystal system?In a cubic lattice, each corner particle is shared among how many unit cells?In a cubic unit cell, a particle at the centre of a face is shared by how many cells?How many particles belong to one simple cubic unit cell?An fcc unit cell has eight corner particles and six face-centre particles. How many particles belong to it?Gold crystallises in an fcc cell with edge 408 pm and molar mass 197 g/mol. Its density is closest to what?Which expression gives the density of a cubic crystal with n particles per cell, molar mass M and edge a?In square close packing in two dimensions, each sphere touches how many neighbours?Which metal crystallises in the simple cubic structure?The coordination number of each sphere in hcp and ccp structures is what?How many tetrahedral voids are associated with each atom in an hcp or ccp structure?In an hcp or ccp structure of N atoms, how many octahedral voids are present?What percentage of the volume of a bcc lattice is empty space?The packing efficiency of fcc, ccp and hcp lattices is about what?What does the coordination number of an atom in a bcc lattice equal?In a Schottky defect, what is missing from the lattice?How does a Schottky defect affect the density of an ionic solid?A Frenkel defect arises when an ion does what?Which ionic compound is known for showing Frenkel defect?What happens to the density of a crystal with Frenkel defects?A vacancy defect in a crystal lowers its density because what happens?Crystallisation at a slower rate has what effect on crystal defects?Heating NaCl in sodium vapour gives it a colour because of which defect?A solid with conductivity of 10^5 ohm^-1 m^-1 is classified as which type?Silicon and germanium are examples of which class of solids by conductivity?Doping silicon with phosphorus gives which type of semiconductor?Which dopant makes germanium a p-type semiconductor?Solids with unpaired electrons that are weakly attracted by a magnetic field are called what?Which of these materials is an amorphous solid?Which one of these is a large crystal found in everyday life?Most metals, rocks and ceramics are best described as which kind of solid?What is the smallest repeating unit that has the full symmetry of a crystal structure?In general, a unit cell is described geometrically as which solid shape?The edges a, b, c and angles alpha, beta, gamma together give how many lattice parameters?Into how many crystal systems are all crystals grouped?How many threefold rotation axes does the cubic lattice system have, lying along the body diagonals?A stacking pattern of layers repeating as ABABAB gives which close packing?A stacking pattern of ABCABCABC corresponds to which arrangement of atoms?The unit cell of a cubic close packed arrangement of atoms is which cell?What percentage of space is filled in both FCC and HCP packing of equal spheres?In an fcc unit cell, the close-packed layers lie parallel to which set of planes?The atomic packing factor of a structure measures which quantity?Who proved the highest density achievable by a lattice packing of equal spheres?Who proved the Kepler conjecture about the densest sphere packing?What are the interstitial sites of a crystal lattice?A lattice site that would be occupied in a perfect crystal but is empty is called what?An atom sitting where the crystal normally has no atom creates which defect?A nearby vacancy and interstitial pair is known as which defect?An impurity atom occupying a regular lattice site produces which defect?Point defects occur at or around what?Which defects are linear and leave the lattice atoms misaligned around a line?The two basic types of dislocations are which pair?For an edge dislocation, how is the Burgers vector oriented to the dislocation line?Mobile dislocations explain which characteristic property of metals?Which technique can be used to observe dislocations directly?Stacking faults are most commonly seen in which kind of structure?Which defect introduces a plane of mirror symmetry into the ordering of a crystal?Which of these is a bulk, three-dimensional defect?The English word crystal comes from which ancient language?Crystals that show obvious, well-formed flat faces are known as what?A crystal's habit refers to which of its features?In an ordered alloy, atoms of different types exchanging positions create which defect?In silica, an oxygen atom with only one Si bond is called what?The Stone Wales defect in nanotubes is an example of which type of defect?How many space groups describe all possible symmetric arrangements in three dimensions?The group of atoms placed around every lattice point of a crystal is called what?