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NEET CHEMISTRYMedium

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has a high melting point?

A

Metallic bonding

B

Van der Waals' bonding

C

Ionic bonding

D

Covalent bonding

Step-by-Step Solution

  1. Metallic Luster (Reflects Light): Metals have a unique luster and reflect light due to the presence of free, mobile electrons (sea of electrons) that interact with incident light.
  2. Electrical Conductivity vs Temperature: Metals are excellent conductors due to these free electrons. However, metallic (electronic) conductance decreases with an increase in temperature [Class 12 Chemistry, Unit 2, Sec 2.4.1]. This occurs because increasing temperature increases the thermal vibration of the positive metal kernels, which hinders the flow of electrons.
  3. High Melting Point: Strong metallic bonding (electrostatic attraction between positive kernels and the electron sea) generally results in high melting points [Class 12 Chemistry, Unit 4, Sec 4.3.1].
  4. Comparison: Ionic solids are insulators in the solid state. Covalent network solids (like diamond) have high melting points but are insulators. Molecular solids (Van der Waals) have low melting points.
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