Recent questions tagged ch-1

Sodium chloxide , Nacl usually crystallizes in a face centered cubic lattice . How many ions are in contact with any single $Na^{+}$ ion ?

asked Sep 8, 2015 by meena.p

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Which of the following is a molecular crystal ?

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What is the percentage efficiency of packing in case of a simple cubic lattice ?

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Anti ferromagnetic substance have not dipole alignment

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Zinc oxide on heating twins _________ colour .

asked Sep 8, 2015 by meena.p

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Zinc oxide on heating turns ___________ colour

asked Sep 7, 2015 by meena.p

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Name an element with which silicon should be doped to give n type semi- conductor ?

asked Sep 7, 2015 by meena.p

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What type of semiconductor is obtained when silicon is doped with arsenic

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Iodine molecules are held in the crystal lattice by

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Which of the following is a network solid ?

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Which of the following is true about the value of refractive index of quartz glass?

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How many lattice points are there in one cell of bcc.

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At what temperature range, most of the metals become super conductors?

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What happens when a ferromagnetic solid is heated ?

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Give reason for the appearance of colour in alkali metal halides

asked Sep 7, 2015 by meena.p

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Arrange the following types of interactions in correct order of their increasing strength

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Name the solid which has the weakest inter molecular force?

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What is the coordination number of carbon, in diamond ?

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Name a liquefied metal which expands on solidification

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Graphite is a good conductor of electricity due to the presence of

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Which of the following oxides shows electrical properties like metals

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The lattice site in a pure crystal cannot be occupied by

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Graphite cannot be classified as

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Which of the following is true about the charge acquired by p- type semiconductor .

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To get a n- type , semi conductor from silicon, it should be doped with a substance with valence

asked Sep 7, 2015 by meena.p

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The total number of tetrahedral voids in the face- centred unit cell

asked Sep 7, 2015 by meena.p

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The percentage of empty space in a body centred cubic arrangement is

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What is the coordinate number in a square close packed structure in two dimensions .

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Silicon doped with electron - rich impurity forms :

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A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because

asked Sep 7, 2015 by meena.p

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The correct order of packing efficiency in different types of unit cell is

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Which of the following defect decrease the density ?

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Frenkel defect is also known as

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A compound contains two types of atoms x and y , it crystallizes in a cubic lattice with atoms X at the corners of the unit cell and atoms y at the body centers . The simplest possible formula of this compound is

asked Sep 4, 2015 by meena.p

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The schottky defects arises due to

asked Sep 4, 2015 by meena.p

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If a cation leaves a site in a solid lattice, and is located at an interstitial position , the lattice defect is $a/an$

asked Sep 4, 2015 by meena.p

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When the radius ratio lie between $0.732$ and $0.414$ the arrangement of the crystal is

asked Sep 3, 2015 by meena.p

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In a ZNS structure :

asked Sep 3, 2015 by meena.p

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Which of the following expressions is correct for CSCI unit with lattice parameter a?

asked Sep 3, 2015 by meena.p

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$Nio$ adops a rock- salt structure the coordination number of the $Ni^{2+}$ ion is

asked Sep 3, 2015 by meena.p

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The h.c.p and c.c.p structure for a given element would be expected to have

asked Sep 3, 2015 by meena.p

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The fluorite structure shows $8:4$ coordination which of the following show fluoride - like lattices ?

asked Sep 3, 2015 by meena.p

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Potassium metal crystallizes in the form of a body centered cubic structure . The number of nearest neighbor atom for each potassium atom in the solid is

asked Sep 3, 2015 by meena.p

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How many atoms are there in one unit cell of a body centered cubic crystal

asked Sep 3, 2015 by meena.p

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___________ are poor conductor of electricity and therefore are insulators in solid state ?

asked Sep 3, 2015 by meena.p

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Number of atoms in a unit cell for simple cubic is

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Which of the following solids shows electrical conduction ?

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Which one has highest melting point ?

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In the crystal of $Cscl$ , the nearest neighbours of each $C_s$ ion are

asked Sep 3, 2015 by meena.p

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When electron are trapped into the crystal in anion vacancy , the defect is known as

asked Sep 3, 2015 by meena.p

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