Question

In the metallury of aluminium, purified $Al_2O_3$ is mixed with $Na_3AlF_6$ or $CaF_2$. $Na_3AlF_6$ or $CaF_2$ lowers the melting point of mixture and increases its conductivity.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

If both assertion and reason are true and reason is the correct explanation of assertion

Answer 2

$NaAlF _{6}$ or $CaF _{2}$ is added to the purified $Al _{2} O _{3}$ to lowers the melting point of mixture and increase the cinductivity.