Multiple choice Which of the following materials contains se

Multiple choice. Which of the following materials contains secondary bonding? Steel Graphite Magnesium oxide Sodium chloride Which of the following materials expands the most when heated from room temperature to 100 degree C? Aluminum Diamond Silicon nitride Polycarbonate Which of the following materials has the highest melting temperature? Steel Teflon Aluminum Silicon carbide Which of the following materials is noncrystalline? Glass. Quartz. Aluminum. Aluminum oxide. Which of the following statements regarding the BCC structure is correct?

Solution

1) In graphite there will be van den wall forces between the layers. Van den wall forces do come in secondary bonding hence option B is correct

2) The coefficient of thermal expansion of the following materials is as follows

Polycarbonate > aluminium > silicon nitride > diamond.

Hence option D is correct

3) the melting temperature of

Steel is 1500 deg Celsius

Teflon is 326 deg Celsius

Aluminium 660 deg Celsius

Silicon carbide is 2730 deg Celsius

Hence option D is correct

4) Glass is an amorphous solid which means it is not a crystalline substance