Which of the following is not a basic flux?

Predict conditions under which $Al$ might be expected to reduce $MgO$.

During the extraction of gold,the following reactions take place: $4Au + 8CN^{-} + 2H_2O + O_2 \longrightarrow 4[Au(CN)_2]^{-} + 4OH^{-}$ and $2[Au(CN)_2]^{-} + Zn \longrightarrow [Zn(CN)_4]^{2-} + 2Au$. $X$ and $Y$ are respectively:

In the extraction of copper from its sulphide ore,the slag is formed by adding which of the following?

In the Goldschmidt aluminothermic process,which of the following reducing agents is used?

During the cyanide process,the silver complex ion formed is......