Recent questions tagged ch1

In terms of band theory, what is the difference between a conductor and an insulator

asked Jul 30, 2014 by sreemathi.v

1 answer

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

asked Jul 30, 2014 by sreemathi.v

1 answer

Classify the following as being either a p-type or a n-type semiconductor: B doped with Si

asked Jul 30, 2014 by sreemathi.v

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Classify the following as being either a p-type or a n-type semiconductor: Ge doped with In

asked Jul 30, 2014 by sreemathi.v

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Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

asked Jul 30, 2014 by sreemathi.v

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Non-stoichiometric cuprous oxide, $Cu_2O$ can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2:1. Can you account for the fact that this substance is a p-type semiconductor?

asked Jul 30, 2014 by sreemathi.v

1 answer

What is a semiconductor? Describe the two main types of semiconductors and contrast their conduction mechanism.

asked Jul 30, 2014 by sreemathi.v

2 answers

Analysis shows that nickel oxide has the formula $Ni_{0.98}O_{1.00}$. What fractions of nickel exist as $Ni^{2+}$ and $Ni^{3+}$ ions?

asked Jul 30, 2014 by sreemathi.v

1 answer

Copper crystallises into a fcc lattice with edge length $3.6\times 10^{-8}$cm.Show that the calculated density is in agreement with its measured value of $8.92gcm^{-3}$.

asked Jul 30, 2014 by sreemathi.v

1 answer

If the radius of the octahedral void is r and radius of the atoms in close- packing is R, derive relation between r and R.

asked Jul 30, 2014 by sreemathi.v

1 answer

Niobium crystallises in body-centred cubic structure. If density is $8.55 g cm^{–3}$, calculate atomic radius of niobium using its atomic mass 93 u.

asked Jul 30, 2014 by sreemathi.v

1 answer

A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q?

asked Jul 30, 2014 by sreemathi.v

1 answer

Silver crystallises in fcc lattice.If edge length of the cell is $4.077\times 10^{-8}cm$ and density is $10.5gcm^{-3}$.Calculate the atomic mass of silver.

asked Jul 30, 2014 by sreemathi.v

1 answer

Calculate the efficiency of packing in case of a metal crystals for : face-centered cubic (with the assumptions that atoms are touching each other)

asked Jul 30, 2014 by sreemathi.v

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Calculate the efficiency of packing in case of a metal crystals for : body-centered cubic

asked Jul 30, 2014 by sreemathi.v

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Calculate the efficiency of packing in case of a metal crystals for : simple cubic

asked Jul 30, 2014 by sreemathi.v

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Explain : Ionic solids are hard and brittle

asked Jul 30, 2014 by sreemathi.v

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Explain : The basis of similarities and differences between metallic and ionic crystals.

asked Jul 30, 2014 by sreemathi.v

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How many lattice points are there in one unit cell of each of the following lattice?Body-centred

asked Jul 30, 2014 by sreemathi.v

1 answer