5. Multiple choice (2 points each) Ionic materials consist of positively charged

Question

5. Multiple choice (2 points each) Ionic materials consist of positively charged atoms (cations) and negatively charged (anions). Thus, ionic materials are generally: A. Good electrical conductors because cations and anions can freely move B. Good electrical conductors because electrons can freely move C. Poor electrical conductors due to lack of freely-moving electrons The correct answer is: . Quenching is an effective means to harden carbon iron steels. If not carefully, the steels can easily break due to the rapid crystal structural change during quenching. An atomic packing factor is an important parameter to explain this phenomenon. When FCC iron changes to BCC iron, the volume will: A. Decrease B. Increase The correct answer is: . Grain boundaries of a material are formed as a result of: A. Different material composition B. Different crystalline structure C. Identical single crystals at different directions D. Identical materials with different chemical bonding The correct answer is: .

Explanation / Answer

Answer 5)

Statment : Ionic materials consist of positively charged atoms (cations) and negatively charged (anions). Thus, ionic materials are generally:

Options :

A. YES, Good electrical conductors because cations and anions can freely move.

Ionic material is consisting of cations and anions (almost in 1:1 stoichiometry) formed due to complete transfer of electron from a metal (getting converted into cation) to non metal (getting converted into anion).

After an electron transfer, once species i.e. cation and anion formed the bind in specific crystaline stucture. On application of an electricity the act as electrostatic point charges and conducts electricity.

B. YES Good electrical conductors BUT NOT because electrons can freely move. ELectrons do not move but ions does and gives conductivity.

C. NO. Poor electrical conductors due to lack of freely-moving electrons.

Answer option : (A) Good electrical conductors because cations and anions can freely move.

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