The most unsymmetrical unit cell is

1.  Monoclinic

2.  Triclinic

3.  Orthorhombic

4.  Tetragonal

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4
Correct Answer :

Triclinic


Explanation :
No Explanation available for this question

A pure crystalline substance on heating forms a turbid looking liquid at a constant temperature and then at a still higher constant temperature the turbidity completely disappears. This behaviour is characteristic of

1.  Isomeric crystal

2.  Liquid crystals

3.  Isomorphous crystals

4.  Allotropic crystals

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4
Correct Answer :

Liquid crystals


Explanation :
No Explanation available for this question

In a primitive cubic lattice, the percentage of void volume is

1.  52.36%

2.  25.95%

3.  74.05%

4.  47.64%

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4
Correct Answer :

47.64\%


Explanation :
No Explanation available for this question

ABABABA...type of arrangement of different layers in close packed structure is called

1.  Hexagonal close packed

2.  Cubic close packed

3.  Face centred close packed

4.  Body centred close packed

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4
Correct Answer :

Hexagonal close packed


Explanation :
No Explanation available for this question

A compound AB crystallizes in bcc lattice with unit cell edge length of 480pm. If the radius of B- is 225pm, then the radius of A+ is

1.  225 pm

2.  190.7 pm

3.  129.6 pm

4.  132.8 pm

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4
Correct Answer :

225 pm


Explanation :
No Explanation available for this question

In a cubic crystal anions are arranged in fcc arrangement and the cations occupy all the octahedral voids and half the tetrahederal voids. The ratio of the cations and anions in the crystal is

1.  1 : 1

2.  2 : 1

3.  1 : 2

4.  3 : 2

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4
Correct Answer :

2 : 1


Explanation :
No Explanation available for this question

The standard heat of formation at 101.3kNm-2 an 298K is arbitarily taken to be zero for

1.  Gaseous bromine atoms

2.  Gaseous bromine molecules

3.  Liquid bromine

4.  Solid bromine

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4
Correct Answer :

Liquid bromine


Explanation :
No Explanation available for this question

For an ideal gas, the joule Thomson co-efficient is equal to

1.  1

2.  0

3.  2

4.  infinity

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4
Correct Answer :

0


Explanation :
No Explanation available for this question

Which of the following gases has the highest heat of combution

1.  Acetylene

2.  Ethylene

3.  Ethane

4.  Methane

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4
Correct Answer :

Ethane


Explanation :
No Explanation available for this question

In which case of mixing of a strong acid and a strong base each of 1 M concentration, temperature increase is highest

1.  15 ml acid - 40 ml alkali

2.  10 ml acid - 25 ml alkali

3.  20 ml acid - 20 ml alkali

4.  40 ml acid - 20 ml alkali

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4
Correct Answer :

20 ml acid - 20 ml alkali


Explanation :
No Explanation available for this question
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