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Test: Classification of Crystalline Solids (Old NCERT) - Grade 12 MCQ


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5 Questions MCQ Test - Test: Classification of Crystalline Solids (Old NCERT)

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Test: Classification of Crystalline Solids (Old NCERT) - Question 1

Which of the following statements is not correct about molecular crystals?

Detailed Solution for Test: Classification of Crystalline Solids (Old NCERT) - Question 1

Molecular crystals are bad conductors of electricity as the electrons are localised in the bonds.

Test: Classification of Crystalline Solids (Old NCERT) - Question 2

Ionic solids conduct electricity In molten state but not in solid state because

Detailed Solution for Test: Classification of Crystalline Solids (Old NCERT) - Question 2

Ionic solids conduct electricity in molten state since in molten state ionic solids dissociate to give free ions which in solid state are not free to move and are held together by strong electrostatic forces of attraction.

Test: Classification of Crystalline Solids (Old NCERT) - Question 3

Which of the solids show the following properties?
(i) Electrical conductivity
(ii) Malleability
(iii) Ductility
(iv) Fairly high melting point

Detailed Solution for Test: Classification of Crystalline Solids (Old NCERT) - Question 3

Metallic solids conduct electricity in molten state as well as solid state and are malleable, ductile and have fairly high melting point.

Test: Classification of Crystalline Solids (Old NCERT) - Question 4

The major binding force of diamond, silicon and quartz is

Detailed Solution for Test: Classification of Crystalline Solids (Old NCERT) - Question 4

In covalent solids, the forces of attraction are covalent bond forces.

Test: Classification of Crystalline Solids (Old NCERT) - Question 5

Solid X is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it?

Detailed Solution for Test: Classification of Crystalline Solids (Old NCERT) - Question 5

Covalent solids or network solids are very hard with high melting point and are insulators in solid as well 25 in molten state.

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