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Recent questions tagged ch1

The atomic radius of strontium is 215pm and it crystallizes with a cubical closest-packed structure.Calculate the density of strontium.The molar mass of strontium is $87.6gmol^{-1}$.

asked Jul 16, 2014 by sreemathi.v

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals.The edge length of unit cell is 412pm.Determine the ionic radius of $Cs^+$ if the ionic radius of $Cl^-$ is 181pm.Given :M(Cs)=$133gmol^{-1}$

asked Jul 16, 2014 by sreemathi.v

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals.The edge length of unit cell is 412pm.Determine the density of CsCl.Given :M(Cs)=$133gmol^{-1}$

asked Jul 16, 2014 by sreemathi.v

1 answer

The edge length of a cubic unit cell of metallic calcium is 556pm.If the density of calcium is $1.54gcm^{-3}$ and its molar mass is $40.08gmol^{-1}$,calculate the radius of calcium atom

asked Jul 16, 2014 by sreemathi.v

1 answer

Calculate the radius of molybdenum atom if the element crystallizes as body-centred cubic crystals.Given : Density of $Mo=10.3gcm^{-3}$ and molar mass of $Mo=95.94gmol^{-1}$ .

asked Jul 16, 2014 by sreemathi.v

1 answer

Which of the following statements are correct?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

Find out the ratio of the mole-fraction of the Frenkel’s defect in $NaCl$ crystal at $4000\;K$ temperature. The amount of energy needed to form Frenkel’s defects and Schottky defects are respectively $2\;eV$ and $4\;eV$.

asked Jul 15, 2014 by balaji.thirumalai

1 answer

Which of the following statements is incorrect?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

Which of the following statements is incorrect?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces. If side length is 10$A^{\large\circ}$, what is the density of the solid assuming atomic weights of A and B as 50 and 100 gms respectively.

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A metal crystallizes in two cubic phases FCC and BCC with unit length equal to 350 pm and 300 pm. The ratio of densities of FCC and BCC is about?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A substance which has a face centered cubic crystal has a density of 1.984 gcm$^{-3}$ and the edge length of the unit cell equal to 630 ppm. What is the molar mass of the substance?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The cubic unit cell of aluminium has an edge length of 405 pm. If its density is 2.7 gcm$^{-3}$, what is the type of unit cell? (Note: Molar mass = 27 g/mol)

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The unit cell length of sodium chloride crystal is 564 pm. What is its density?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a diamond shaped cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a face centric cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a body centric cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The fraction of volume occupied in a primitive cubic cell is:

asked Jul 15, 2014 by balaji.thirumalai

1 answer

What is the total number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each diagonal?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

In a ccp of mixed oxide, it is found that lattice has $O^{2-}$ ions and one half of the octahedral voids are occupied by trivalent cataions ($X^{3+}$) and one eight of the tetrahedral voids by divalent cataions ($Y^{2+}$). What is the formula of the mixed oxide?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A compound is formed by 2 elements M and N. The element N forms ccp and atoms of M occupy a third of tetrahedral voids. What is the formula of the compound?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

A compound is formed by 2 elements M and N. The element N forms ccp and atoms of M occupy a third of tetrahedral voids. What is the formula of the compound?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces. What is the empirical formula for this compound?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

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