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Recent questions tagged ch1
Questions
Sodium crystallises in the cubic lattice and the edge of the unit cell is 430pm.Calculate the number of atoms in a unit cell.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
easy
additionalproblem
q32
asked
Aug 4, 2014
by
sreemathi.v
1
answer
An element has a body centred cubic structure with a cell edge of 288 pm.The density of the element is $7.2gcm^{-3}$.calculate the number of atoms present in 280g of the element.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
additionalproblem
q31
asked
Aug 4, 2014
by
sreemathi.v
1
answer
An element E crystallizes in body-centred cubic structure.If the edge centre of the cell is $1.469\times 10^{-10}$m and the density is $19.3gcm^{-3}$.Calculate the atomic mass of this element.Also calculate the radius of an atom of this element.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q30
asked
Aug 4, 2014
by
sreemathi.v
1
answer
In an ionic compound the anion $(N^-)$ from cubic close type of packing,while the cation $(M^+)$ ions occupy one third of the tetrahedral voids.Deduce the empirical formula of the compound and the coordination number of $(M^+)$ ions.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
easy
additionalproblem
q29
asked
Aug 4, 2014
by
sreemathi.v
1
answer
Analysis shows that a metal oxide has the empirical formula $M_{0.96}O_{1.00}$.Calculate the percentage of $M^{2+}$ and $M^{3+}$ ions in the crystal?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
difficult
additionalproblem
q28
asked
Aug 4, 2014
by
sreemathi.v
1
answer
The pycnometric density of sodium chloride crystal is $2.165\times 10^3kg m^{-3}$ while its X-ray density is $2.178\times 10^3kg m^{-3}$.The fraction of the unoccupied sites in sodium chloride crystal is
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q27
asked
Aug 1, 2014
by
sreemathi.v
1
answer
In a cubic lattice each edge of the unit cell is 400pm.Atomic weight of the element is 60 and its density is $6.25g/c.c$.Avogadro number =$6.023\times 10^{23}$.What will be the crystal lattice.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
difficult
additionalproblem
q26
asked
Aug 1, 2014
by
sreemathi.v
1
answer
You are given marbles of diameter 10mm.They are to be placed such their centres are lying in a square bond by four lines each of length 40mm.What will be the arrangement of marbles in a plane so that maximum number of marbles can be placed inside the area?Derive the expression for the number of molecules per unit area.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
additionalproblem
q25
asked
Aug 1, 2014
by
sreemathi.v
1
answer
The first order reflection of a beam of X-rays of wavelength $1.54A^{\large\circ}$ from the (1 0 0) plane of a crystal of the simple cubic type occurs at an angle of $11.29^{\large\circ}$.Calculate the length of the unit cell.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q24
asked
Aug 1, 2014
by
sreemathi.v
1
answer
A sample of wustite $Fe_xO$ contains one Fe(III) for every three Fe(II).Calculate the value of $x$.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q23
asked
Aug 1, 2014
by
sreemathi.v
1
answer
The edge length of a cubic unit cell of metallic calcium is 556 pm.If the density of calcium is $1.54gcm^{-3}$ and its molar mass is $40.08gmol^{-3}$.Calculate the radius of calcium atom.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q22
asked
Aug 1, 2014
by
sreemathi.v
1
answer
An element having atomic mass 60 has face-centered cubic unit cells.The edge length of the unit cell is 400pm.Find the density of the element.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
difficult
additionalproblem
q21
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Calcium crystallises in a face-centred cubic unit cell with a=0.556nm.Calculate the density if it contained 0.1% Schottky defects.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q20-ii
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Calcium crystallises in a face-centred cubic unit cell with a=0.556nm.Calculate the density if it contained 0.1% Frenkel defects.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q20-i
asked
Aug 1, 2014
by
sreemathi.v
1
answer
If NaCl is doped with $10^{-3}$ mole percentage of $SrCl_2$,what is the concentration of cation vacancy?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q19
asked
Aug 1, 2014
by
sreemathi.v
1
answer
In a crystalline solid,having formula $AB_2O_4$,oxide ions are arranged in cubic close packed lattice while cations A are present in tetrahedral voids and cations B are present in octahedral voids.What percentage of the tetrahedral voids is occupied by A and B?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
medium
additionalproblem
q18
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Copper has the fcc crystal structure.Assuming an atomic radius of 130pm for copper atom (Cu = 63.54).Find the density of Cu.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q17-d
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Copper has the fcc crystal structure.Assuming an atomic radius of 130pm for copper atom (Cu = 63.54).How many atoms belong to the unit cell?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q17-c
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Copper has the fcc crystal structure.Assuming an atomic radius of 130pm for copper atom (Cu = 63.54).What is the volume of the unit cell?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q17-b
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Copper has the fcc crystal structure.Assuming an atomic radius of 130pm for copper atom (Cu = 63.54).What is the length of unit cell of Cu?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q17-a
asked
Aug 1, 2014
by
sreemathi.v
1
answer
X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of $3.608\times 10^{-8}$cm.In a separate environment,copper is determined to have a density of $8.92g/cm^3$,calculate the atomic (molar) mass of the copper.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
easy
additionalproblem
q16
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Prove that the void space percentage in zinc blende structure is 25%
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
additionalproblem
q15
asked
Aug 1, 2014
by
sreemathi.v
1
answer
KCl crystallizes in the same type of lattice as does $NaCl$.Given that,$\large\frac{r_{Na^+}}{r_{Cl^-}}=$$0.5,\large\frac{r_{Na^+}}{r_{K^+}}=$$0.7$.Calculate the ratio of the side of the unit cell for KCl to that for NaCl and the ratio of density of NaCl to that for KCl.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
difficult
additionalproblem
q14
asked
Aug 1, 2014
by
sreemathi.v
1
answer
The unit cell in a crystal of diamond belongs to a cubic crystal system but doesn't correspond to the Bravais lattice.The volume of unit cell of diamond is $0.0454nm^3$ and the density of diamond is $3.52g/cc$.Find the number of carbon atoms in a unit cell of diamond?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q13
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Calculate the wavelength of X-rays which produces a diffraction angle $2\theta$ equal to $16.80^{\large\circ}$ for a crystal.Assume first order diffraction with inter particle distance in crystal of 0.2 nm
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q12
asked
Aug 1, 2014
by
sreemathi.v
1
answer
A unit cell of sodium chloride has four formula units.The edge length of the unit cell is 0.564nm.What is the density of sodium chloride?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q11
asked
Aug 1, 2014
by
sreemathi.v
1
answer
A compound formed by elements A and B crystallizes in cubic structure where A atoms are at the corners of a cube and B atoms are at the face-centre.What is the formula of the compound?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
medium
additionalproblem
q10
asked
Aug 1, 2014
by
sreemathi.v
1
answer
The length of the unit cell edge of a body-centred cubic metal crystal is 352pm.Calculate the radius of an atom of the metal.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q9
asked
Aug 1, 2014
by
sreemathi.v
1
answer
By X-ray diffraction it is found that nickel crystals are face-centred cubic.The edge of the unit cell is $3.52A^{\large\circ}$.The atomic mass of nickel is $58.7$ and its density is $8.94g/cm^3$.Calculate Avogadro's number from the data.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q8
asked
Aug 1, 2014
by
sreemathi.v
1
answer
Iron crystallizes in a bcc system with a lattice parameter of $2.861A^{\large\circ}$.Calculate the density of iron in the bcc system.(Given : Atomic weight of $Fe=56,N=6.023\times 10^{23}mol^{-1}$)
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
medium
additionalproblem
q7
asked
Aug 1, 2014
by
sreemathi.v
1
answer
A metal of density $7.5\times 10^3kgm^{-3}$ has an fcc crystal structure with lattice parameter $a=400$pm.Calculate the number of unit cells present in 0.015kg of the metal
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q6
asked
Aug 1, 2014
by
sreemathi.v
1
answer
The unit cell of metallic gold is face centred cubic.What is the mass of a gold unit cell?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q5-b
asked
Jul 31, 2014
by
sreemathi.v
1
answer
The unit cell of metallic gold is face centred cubic.How many atoms occupy the gold unit cell?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q5-a
asked
Jul 31, 2014
by
sreemathi.v
1
answer
At what angles with X-rays of wavelength $1.542\times 10^{-10}m$ undergo first order and second order reflections by planes separated by $3.5\times 10^{-10}m$?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
easy
additionalproblem
q4
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Using X-rays of wavelength 154.1pm and starting from the glancing angle,the reflection from silver crystal was found to occur at $\theta=22.20^{\large\circ}$.Calculate the spacing between the planes of Ag atoms that gave rise to the above reflection.($\sin 22.20^{\large\circ}=0.3778$)
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
additionalproblem
q3
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Calculate the angle at which second-order reflection will occur in an X-ray spectrometer when X-rays of 0.154nm are diffracted by the atoms of a crystal having distance b/w two planes at 404 pm
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
medium
additionalproblem
q2
asked
Jul 31, 2014
by
sreemathi.v
1
answer
A sample of crystalline solid scatters a beam of X-rays of wavelength 70.93pm at an angle $2\theta$ of $14.66^{\large\circ}$.If this is a second order reflection (n=2),calculate the distance between the parallel planes of atoms from which the scattered beam appears to have been reflected.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
additionalproblem
q1
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Explain the following with suitable examples: 12-16 and 13-15 group compounds.
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
difficult
bookproblem
q1.26-v
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Explain the following with suitable examples: Antiferromagnetism
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.26-iv
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Explain the following with suitable examples: Ferrimagnetism
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
difficult
bookproblem
q1.26-iii
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Explain the following with suitable examples: Paramagnetism
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.26-ii
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Explain the following with suitable examples: Ferromagnetism
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.26-i
asked
Jul 31, 2014
by
sreemathi.v
1
answer
If NaCl is doped with $10^{–3}$ mol % of $SrCl_2$, what is the concentration of cation vacancies?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
easy
bookproblem
q1.25
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.How many unit cells are there in $1.00cm^3$ of aluminium?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
difficult
bookproblem
q1.24-ii
asked
Jul 31, 2014
by
sreemathi.v
1
answer
Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.What is the length of the side of the unit cell?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
difficult
bookproblem
q1.24-i
asked
Jul 30, 2014
by
sreemathi.v
1
answer
Explain the following term with suitable examples: F-centres
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.23-iv
asked
Jul 30, 2014
by
sreemathi.v
1
answer
Explain the following term with suitable examples: Interstitials
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.23-iii
asked
Jul 30, 2014
by
sreemathi.v
1
answer
Explain the following term with suitable examples: Frenkel defect
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.23-ii
asked
Jul 30, 2014
by
sreemathi.v
1
answer
Explain the following term with suitable examples: Schottky defect
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-c
easy
bookproblem
q1.23-i
asked
Jul 30, 2014
by
sreemathi.v
1
answer
In terms of band theory, what is the difference between a conductor and a semiconductor
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-b
medium
bookproblem
q1.22-ii
asked
Jul 30, 2014
by
sreemathi.v
1
answer
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