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Recent questions tagged chemistry
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In $Nacl$ crystal each $cl^{-}$ ion is surrounded by
cbse
class12
chemistry
ch-1
solid-state
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Sep 8, 2015
by
meena.p
1
answer
In an antifluorite structure , cations occupy
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
In a face centred cubic (fcc) arrangement, the number of atoms per unit cell is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
2
answers
If the distance between $Na^{+}$ and $cl^{-}$ions in sodium chloride crystal is $xpm$, the length of the edge of the unit cell is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
A p- type materialy is electrically
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
A metallic crystal having bcc type staking pattern , what percentage of volume of this lattice is empty .
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
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
cbse
class12
chemistry
ch-1
sec-b
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
In which of the following crystal alternate tetrahedral voids are occupied ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
An conic compound is expected to have tetrahedral structure if $\large\frac{r^+}{r^-}$ lies in the range of
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
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
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
Percentage of free space in cubic close packed structure and in body centered packed structure are respectively
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
Sodium chloxide , Nacl usually crystallizes in a face centered cubic lattice . How many ions are in contact with any single $Na^{+}$ ion ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
Which of the following is a molecular crystal ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
What is the percentage efficiency of packing in case of a simple cubic lattice ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
Anti ferromagnetic substance have not dipole alignment
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
Zinc oxide on heating twins _________ colour .
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 8, 2015
by
meena.p
1
answer
Zinc oxide on heating turns ___________ colour
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
0
answers
Name an element with which silicon should be doped to give n type semi- conductor ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
What type of semiconductor is obtained when silicon is doped with arsenic
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Iodine molecules are held in the crystal lattice by
cbse
class12
chemistry
ch-1
solid-state
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Sep 7, 2015
by
meena.p
1
answer
Which of the following is a network solid ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Which of the following is true about the value of refractive index of quartz glass?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
How many lattice points are there in one cell of bcc.
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
At what temperature range, most of the metals become super conductors?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
What happens when a ferromagnetic solid is heated ?
cbse
class12
chemistry
ch-1
sec-b
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Give reason for the appearance of colour in alkali metal halides
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Arrange the following types of interactions in correct order of their increasing strength
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Name the solid which has the weakest inter molecular force?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
What is the coordination number of carbon, in diamond ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Name a liquefied metal which expands on solidification
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Graphite is a good conductor of electricity due to the presence of
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Which of the following oxides shows electrical properties like metals
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
2
answers
The lattice site in a pure crystal cannot be occupied by
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Graphite cannot be classified as
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Which of the following is true about the charge acquired by p- type semiconductor .
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
To get a n- type , semi conductor from silicon, it should be doped with a substance with valence
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
The total number of tetrahedral voids in the face- centred unit cell
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
2
answers
The percentage of empty space in a body centred cubic arrangement is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
What is the coordinate number in a square close packed structure in two dimensions .
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
2
answers
Silicon doped with electron - rich impurity forms :
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because
cbse
class12
chemistry
sec-b
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
The correct order of packing efficiency in different types of unit cell is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Which of the following defect decrease the density ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
Frenkel defect is also known as
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 7, 2015
by
meena.p
1
answer
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
cbse
class12
chemistry
sec-b
ch-1
solid-state
asked
Sep 4, 2015
by
meena.p
1
answer
The schottky defects arises due to
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 4, 2015
by
meena.p
1
answer
If a cation leaves a site in a solid lattice, and is located at an interstitial position , the lattice defect is $a/an$
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 4, 2015
by
meena.p
1
answer
When the radius ratio lie between $0.732$ and $0.414$ the arrangement of the crystal is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
In a ZNS structure :
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
Which of the following expressions is correct for CSCI unit with lattice parameter a?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
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