Test: Classification of Crystalline Solids (NCERT)
5 Questions MCQ Test Chemistry Class 12 | Test: Classification of Crystalline Solids (NCERT)
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Which of the following statements is not correct about molecular crystals?
Molecular crystals are bad conductors of electricity as the electrons are localised in the bonds.
Ionic solids conduct electricity In molten state but not in solid state because
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.
Which of the solids show the following properties?
(i) Electrical conductivity
(ii) Malleability
(iii) Ductility
(iv) Fairly high melting point
(i) Electrical conductivity
(ii) Malleability
(iii) Ductility
(iv) Fairly high melting point
Metallic solids conduct electricity in molten state as well as solid state and are malleable, ductile and have fairly high melting point.
The major binding force of diamond, silicon and quartz is
In covalent solids, the forces of attraction are covalent bond forces.
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?
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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