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Recent questions tagged states-of-matter

Why Nitrogen is a gas whereas phosphorous is a solid ?

asked Oct 13, 2016 by meena.p

0 answers

In basic solution, $CrO_4^{2–}$ oxidises $S_2O_3^{2–}$ to form $Cr(OH)_4^{–} \& SO_4^{2–}$. The volume of $0.15\; M CrO_4^{2–}$ required of react with $40\; ml$ of $0.225\;M \;S_2O_3^{2–}$ would be :

asked Jan 18, 2016 by meena.p

1 answer

what would be the ratio of mean square velocity of hydrogen gas at 50K and that of oxygen gas at 800K?

asked Sep 18, 2014 by anonymous

1 answer

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00g.

asked Aug 4, 2014 by sreemathi.v

1 answer

A metallic element has a cubic lattice .Each edge of the unit cell is $2A^{\large\circ}$.The density of the metal is $2.5gcm^{-3}$.The unit cells in 200g of the metal are ?

asked Aug 4, 2014 by sreemathi.v

1 answer

At room temperature ,sodium crystallises in a body-centred cubic lattice with $a=4.24A^{\large\circ}$.The theoretical density of sodium (At.wt of Na=23) is ?

asked Aug 4, 2014 by sreemathi.v

1 answer

Potassium has a bcc structure with nearest neighbour distance $4.52A^{\large\circ}$.Its atomic weight is 39.Calculate its density.

asked Aug 4, 2014 by sreemathi.v

1 answer

An element crystallises in a structure having fcc unit cell with edge length of 200pm.Calculate its density .If 200g of this element contains $24\times 10^{23}$ atoms.

asked Aug 4, 2014 by sreemathi.v

1 answer

An element crystallizes in the simple cubic structure.Its density is $8gcm^{-3}$ and its 200g contains $24\times 10^{23}$ atoms.Calculate the edge length.

asked Aug 4, 2014 by sreemathi.v

1 answer

A metal (atomic mass =50) has a body-centred cubic lattice.The density of the metal is $5.91gcm^{-3}$.Find out the volume of the unit cell.$[N_A=6.023\times 10^{23}]$

asked Aug 4, 2014 by sreemathi.v

1 answer

An element (atomic mass =60) having face-centred cubic unit cell has a density of $6.23gcm^{-3}$.What is edge length of unit cell ?

asked Aug 4, 2014 by sreemathi.v

1 answer

Sodium crystallises in the cubic lattice and the edge of the unit cell is 430pm.Calculate the number of atoms in a unit cell.

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.

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.

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.

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?

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

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.

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.

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.

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 $x$.

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.

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.

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.

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.

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?

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?

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.

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?

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?

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?

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.

asked Aug 1, 2014 by sreemathi.v

1 answer

Prove that the void space percentage in zinc blende structure is 25%

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.

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?

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

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?

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?

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.

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.

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 $Fe=56,N=6.023\times 10^{23}mol^{-1}$)

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

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?

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?

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 $3.5\times 10^{-10}m$?

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.($\sin 22.20^{\large\circ}=0.3778$)

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

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.

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: 12-16 and 13-15 group compounds.

asked Jul 31, 2014 by sreemathi.v

1 answer

Explain the following with suitable examples: Antiferromagnetism

asked Jul 31, 2014 by sreemathi.v

1 answer

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