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The white $z_no$ turns yellow on heating because of

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The radius ratio in $CsCl$ is $0.93$. The expected lattice structure is

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The number of tetrahedral voids in the unit cell of a face centred cubic lattice of similar atoms is

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The number of hexagonal faces that are present in truncated octahedron is

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The conic radii of $Rb^+$ and $ I^-$ are $1.46\;A^{\circ}$ and $2.16\;A^{\circ}$ respectively . The most probable type of structure exhibited by it is

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The efficiency of packing is $68 \%$ in

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The ability of a given substance to assume two or more crystalline structure is called

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Which one of the following is a covalent crystal ?

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Which of the following statements about amorphous solids is incorrect?

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Density of a crystal remains unchanged as a result of

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To get n-type doped semiconductor , the impurity to be added to silicon should have the following numbers of valence electrons ?

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Relationship between atomic radius(r) and the edge length of a body centred cubic unit cell is

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In $Nacl$ crystal each $cl^{-}$ ion is surrounded by

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In an antifluorite structure , cations occupy

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In a face centred cubic (fcc) arrangement, the number of atoms per unit cell is

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If the distance between $Na^{+}$ and $cl^{-}$ions in sodium chloride crystal is $xpm$, the length of the edge of the unit cell is

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A p- type materialy is electrically

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A metallic crystal having bcc type staking pattern , what percentage of volume of this lattice is empty .

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A compound formed by element A and B crystallizes in the cubic. Structure where A atoms are at the coiners of the cube and B atoms are at face centers. The formula of the compound is

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In which of the following crystal alternate tetrahedral voids are occupied ?

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An conic compound is expected to have tetrahedral structure if $\large\frac{r^+}{r^-}$ lies in the range of

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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 coiner of the unit cell and atoms Y at the body center. The simplest possible formula of this compound is

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Percentage of free space in cubic close packed structure and in body centered packed structure are respectively

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

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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 .

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Zinc oxide on heating turns ___________ colour

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

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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

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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

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

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

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