These are the materials which can withstand very high temperatures without melting or becoming soft.
210) Refractory materials are generally used in furnaces because:
Answer is:
They can withstand high temperatures
Explanation:
Related Inorganic Chemistry MCQ with Answers
Answer is:
Na
Explanation:
Because Na is very reactive and can not be extracted by means of reduction by C, CO, etc. So, extracted by electrolysis.
Answer is: