Which of the following characteristics do alloys have?

High melting point and low conductivity

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High melting point and high conductivity

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Low melting point and low conductivity

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Low melting point and high conductivity

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Solution

The correct option is C
Low melting point and low conductivity

An alloy is a mixture of two or more metals or a metal and a non-metal. The electrical conductivity and melting point of an alloy is generally lesser than that of pure metals. For example, brass, an alloy of copper and zinc (Cu and Zn) and bronze, an alloy of copper and tin (Cu and Sn) are not good conductors of electricity whereas copper is widely used for making electrical circuits as it is an excellent conductor.
Similarly, solder, an alloy of lead and tin (Pb and Sn) has a low melting point and is used for welding electrical wires together.

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(a) Compound X consists of molecules.

Choose the letter corresponding to the correct answer from the options A, B, C and D given below :

(i) The type of bonding in X will be :

A. ionic B. electrovalent

C. covalent D. molecular

(ii) X is likely to have a :

A. low melting point and high boiling point,

B. high melting point and low boiling point,

C. low melting point and low boiling point,

D. high melting point and high boiling point.

(iii) In the liquid state, X will :

A. become ionic,

B. be an electrolyte

C. conduct electricity,

D. not conduct electricity.

(b) Electrons are getting added to an element Y :

(i) is Y getting oxidized or reduced ?

(ii) what charge will Y migrate to during the process of electrolysis ?

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