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Recent questions tagged chemistry
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$Nio$ adops a rock- salt structure the coordination number of the $Ni^{2+}$ ion is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
The h.c.p and c.c.p structure for a given element would be expected to have
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
The fluorite structure shows $8:4$ coordination which of the following show fluoride - like lattices ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
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
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
How many atoms are there in one unit cell of a body centered cubic crystal
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
___________ are poor conductor of electricity and therefore are insulators in solid state ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
Number of atoms in a unit cell for simple cubic is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
Which of the following solids shows electrical conduction ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
Which one has highest melting point ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
In the crystal of $Cscl$ , the nearest neighbours of each $C_s$ ion are
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
When electron are trapped into the crystal in anion vacancy , the defect is known as
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
2
answers
The crystalline structure of $Nacl$ is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
The coordination number of a metal crystallizing in a hexagonal close packed (hcp) structure is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
Close packing is maximum in the crystal lattice of
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
Which of the following statements is incorrect about amorphous solids ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 3, 2015
by
meena.p
1
answer
In calcium fluoride structure , the coordination number of calcium and fluoride ions are :
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
The closest packing sequence ABAB ..... represents
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
Germanium or silicon becomes semiconductor due to
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
3
answers
The coordinate number for an atom in a primitive cubic unit cell is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
For tetrahedral coordination number the radius ratio $r_i^+/r_a^-$ is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
In a closed packed array of N spheres the number of tetrahedral holes is
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
Bragg's law is given by the equation
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
A match box exhibits
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
Which one is not the property of crystalline solid ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
Name one soild in which both frenkel and schootty defect occur.
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
Which point defect lowers the density of a crysal ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
How can a material be made amorphous ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
What type of defect can arise when a solid is heated .
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
Which of the following lattices has the highest packing efficiency .
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
What is the two dimensional coordination number of a molecule in square close packed layer ?
cbse
class12
chemistry
ch-1
solid-state
asked
Sep 1, 2015
by
meena.p
1
answer
which of the following is correct about half life period?
jeemain
class12
cbse
chemistry
chemical-kinetics
asked
Jul 18, 2015
by
excellentdeals18
1
answer
for a very dilute solution of h3po3 van't hoff factor
chemistry
class12
liquid-solutions
colligative
properties
jeemain
jeeadvance
asked
Jul 4, 2015
by
excellentdeals18
1
answer
if a solute under goes dimerization and trimerizaton, the minimum values of the van't hoff factors are
class12
ch2
chemistry
liquid-solutions
colligative
properties
jeemain
jeeadvance
asked
Jul 4, 2015
by
excellentdeals18
1
answer
Benzoic acid undergoes dimerisation in benzene solution. the vant's hoff factor'i' is related to the degree of association 'α' of the acid as
chemistry
class12
liquid-solutions
colligativeproperties
jeemain
jeeadvance
asked
Jul 4, 2015
by
excellentdeals18
1
answer
18 gms of glucose and 6 gms Urea are dissolved in 1 litre aqueous solution at 27 °c. the osmotic pressure of solution will be
chemistry
class12
solutions
jeemain
jeeadvance
colligative
properties
asked
Jul 3, 2015
by
excellentdeals18
1
answer
calculate the molal solution depression constant of a solvent which has freezing point 16.6° and latent heat of fusion 180.75J/g
chemistry
class12
solutions
jeemain
jeeadvance
asked
Jul 2, 2015
by
excellentdeals18
1
answer
In electro chemical corrosion of metals undergoing corrosion
jeemain
chemistry
question-paper-4
asked
Apr 16, 2015
by
meena.p
0
answers
In electro chemical corrosion of metals undergoing corrosion
jeemain
chemistry
question-paper-4
asked
Apr 16, 2015
by
meena.p
1
answer
Sodium nitroprusside when added to an alkaline solution of sulphide cons produces a
jeemain
chemistry
question-paper-4
asked
Apr 16, 2015
by
meena.p
1
answer
The hybrdisation of carbon in diamond graphite and acetyline is in the order of
jeemain
chemistry
question-paper-4
asked
Apr 16, 2015
by
meena.p
1
answer
Which alloy contains Mg as one of the constituents
jeemain
chemistry
question-paper-4
asked
Apr 16, 2015
by
meena.p
1
answer
The bond distance between $C-Cl$ in $Ccl_4$ is $1.76\;A^{\circ}$. If the atomic radius of $Cl$ is $C$ is $0.77 A^{\circ}$. The atomic radius of $cl$ is
jeemain
chemistry
question-paper-4
asked
Apr 16, 2015
by
meena.p
1
answer
The first conization energy in electron volts of nitrogen and oxygen atom's are respectively given by
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
On heating sodium metal in a current of dry ammonia, the compound formed is
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
Oxidation number of codine in the following reaction $IO_3^{-1} +HI \to H_2O +I_2$
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
When a vapour , at atmospheric pressure was gradually heated from $25^{\circ}$ its colour was found to deepen at first and then to fade as the temperature was raised above $160^{\circ}$ . At $6000^{\circ}$ the vapour was almost colourless , but its colour deepens when the pressure was raised at this temperature , the vapour was
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
A Substance $A_xB_y$ crystallizes in a face centered cubic (FCC) lattice in which 'A' atoms occupy each corner of the cube and 'B' atoms occupy the centers of each face of the cube , Identify the correct composition of the substance $A_xB_y$
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
Fluoxne is better oxidising agent than $Br_2$ . It is due to
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
The solubility product of silver chlorides is $1.5625 \times 10^{-10}$ at $ 25^{\circ}C$. Find its solubility in $gL^{-1}$
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
Which of the following reacts with water at high rate?
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
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