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Recent questions and answers in States of Matter - Solid State

Questions >> CBSE XII >> Chemistry >> States of Matter - Solid State

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

answered Nov 8, 2018 by amilasbest15

2 answers

In a face centred cubic (fcc) arrangement, the number of atoms per unit cell is

answered Aug 5, 2018 by jayachandhacking

2 answers

The total number of tetrahedral voids in the face- centred unit cell

answered Aug 5, 2018 by jayachandhacking

2 answers

When electron are trapped into the crystal in anion vacancy , the defect is known as

answered Apr 7, 2018 by shubhamkumar73193

2 answers

The ability of a given substance to assume two or more crystalline structure is called

answered Feb 9, 2018 by syamantaksarkar2002

2 answers

r atomic mass of gold 197u , atomic radius=0.144nm crystallizes in a face centred cubix unit cell . Determine the density of gold?

answered Jul 27, 2017 by sharmaaparna1

1 answer

Germanium or silicon becomes semiconductor due to

answered Jul 23, 2017 by shehenazbegum1972

3 answers

Give the Relationship between radius of constituent particle (r) and edge lengt

answered Jun 2, 2017 by pady_1

1 answer

What are the Types of voids:

answered Jun 2, 2017 by pady_1

1 answer

<div>Explain the Number of particles at different lattice positions</div>

answered Jun 2, 2017 by pady_1

1 answer

<span style="font-family: Calibri, sans-serif; font-size: 14.6667px; line-height: 16.8667px;">Give the properties of crystalline solids ?

answered Jun 2, 2017 by pady_1

1 answer

<span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif&quo

answered May 31, 2017 by pady_1

1 answer

Define Point defect and give its types

answered May 31, 2017 by pady_1

1 answer

What is semiconductors? Give its type

answered May 31, 2017 by pady_1

1 answer

Define Point defect and give its types

answered May 31, 2017 by pady_1

1 answer

What is packing fraction and coordination number ?

answered May 31, 2017 by pady_1

1 answer

What are the three types of Centred Unit Cell.

answered May 22, 2017 by pady_1

1 answer

What is Crystal Lattice and give its Characteristics.

answered May 22, 2017 by pady_1

1 answer

Which of the following statement is not true about amorphous solids ?

answered Apr 28, 2017 by meena.p

1 answer

Iodine molecules are held in the crystals lattice by _________

answered Apr 28, 2017 by meena.p

1 answer

Which of the following is an amorphous solid ?

answered Apr 28, 2017 by meena.p

1 answer

The sharp melting point of crystalline solids is due to ________

answered Apr 28, 2017 by meena.p

1 answer

Which of the following is not a characteristic of a crystalline solid ?

answered Apr 28, 2017 by meena.p

1 answer

Which of the following is true about the value of refractive index of quartz glass ?

answered Apr 28, 2017 by meena.p

1 answer

Which of the following condition favours the existence of a substance in the solid state ?

answered Apr 28, 2017 by meena.p

1 answer

Which of the following oxides shows electrical properties like metals

answered Feb 20, 2017 by rupeshkumar4045

2 answers

Earth receives enormous amount of energy from sunlight. The problem of shortage of power can be solved if we could convert solar energy into electricity. A device which generates electrical power from sunlight is called solar cell or photovoltaic cell. Solar cells are made up of silicon doped with arsenic and silicon doped with boron. Answer the following questions: (i) When silicon is doped with arsenic, what type of semiconductor is obtained? Explain. (ii) What type of semiconductor is obtained by doping silicon with boron? (iii) Give any two applications (other than solar cells) of semiconductors.

answered Nov 28, 2016 by meena.p

1 answer

Analysis shows that nickel oxide has the formula $Ni0_{98}O_{1.00}$. What fractions of nickel exist as $Ni^{2+}$ and $Ni_{3+}$ ions?

answered Nov 23, 2016 by meena.p

1 answer

Give reason (a) window glass of old building look milky. (b) window glass of old building is thick at bottom (c) $Cacl_2$ will introduced schotlky defect if added to $Agcl$ crystal

answered Nov 23, 2016 by meena.p

1 answer

How is ferromagnetism different from paramagnetism

answered Nov 21, 2016 by meena.p

1 answer

Why does the electrical conductivity of semiconductor increase in temperature ?

answered Nov 21, 2016 by meena.p

1 answer

Gold (atomic mass $=197\;v$ atomic radius $=0.144\;nm$) crystallizers in a face centered unit cell . Determined the density of gold $[N_A=6.022 \times 10^{23}mol^{-1}]$

answered Nov 15, 2016 by meena.p

1 answer

Why is an increase in temperature observed on mixing chloroform with acetone ?

answered Nov 9, 2016 by meena.p

1 answer

Ionic solid conduct in the molten state but not in the solid state . Explain

answered Nov 9, 2016 by meena.p

1 answer

Copper crystallizer into an fcc lattice with edge length $3.61 \times 10^{-8}\;cm$ Show that the calculated density is in agreement with its measured value of $8.92 \;g\;cm^{-3}$

answered Nov 4, 2016 by meena.p

1 answer

Define the following terms in relation to crystalline solids . (i) Unit cell (ii) Coordination number . Give one example in each case

answered Nov 2, 2016 by meena.p

1 answer

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

answered Oct 26, 2016 by meena.p

1 answer

What type of defect can arises when a solid is heated ? Which physical properly is affected by it and in what way ?

answered Oct 26, 2016 by meena.p

1 answer

Aluminium crystallizes in a cubic - packed structure . Radius of the atom in the metal is $125\;pm$ (i) What is the length of the side of the unit cell ? (ii) How many unit cells are there in $1\;cm^3$ of aluminium ?

answered Oct 25, 2016 by meena.p

1 answer

A compound is formed by two elements, M and N . The element N forms CCP and atoms of M occupy $\large\frac{1}{3}$ rd of tetrahedral voids . What is the formula of the compound?

answered Oct 21, 2016 by meena.p

1 answer

Sodium crystallizes in a bcc unit cell , calculate the appropriate number of unit cell in $9.2\;g$ of sodium (Atomic mass of Na=23 u)

answered Oct 19, 2016 by meena.p

1 answer

(a) Calculate the charge in coulombs required for oxidation for 2 moles of water to oxygen. [Given $IF= 96,500\;c\;mol^{-1}$] (b) Zinc / Silver oxide cell is used is hearing aids and electric watches . The following reaction occur. $Zn(S) \to Z_n^{2+} (aq)+2e^{-} E^0_{Zn^{2+}/Zn}=-0.76\;V \\ Ag_20+H_2O+2e^{-} \to 2Ag +2 OH - E^0_{Ag^{+}/Ag}=0.344\;V$ Calculate (i) Standard potential of the cell (ii) Standard Gibbs energy .

answered Oct 19, 2016 by meena.p

1 answer

Why Nitrogen is a gas whereas phosphorous is a solid ?

asked Oct 13, 2016 by meena.p

0 answers

An aqueous of methanol in water has vapor pressure :

answered Jun 14, 2016 by omhealthcentre

2 answers

Heating of rubber with sulphur is known as :

answered Dec 17, 2015 by meena.p

1 answer

What is formed when a primary alcohol undergoes catalytic dehydrogenation ?

answered Nov 24, 2015 by meena.p

1 answer

Ethyl chloride is concerted into diethyl ether by

answered Nov 24, 2015 by meena.p

1 answer

The nitro group in nitrobenzene is

answered Nov 23, 2015 by meena.p

1 answer

Number of the parts by weight of solute in one million parts by weight of the solution is called as

answered Sep 9, 2015 by meena.p

1 answer

In $Nacl$ crystal each b$cl^{-}$ ion is surrounded by

asked Sep 9, 2015 by meena.p

1 answer

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