Which of the following is a non-ferrous alloy?

Addition of high proportions of manganese makes steel useful in making rails of rail-roads because manganese

What is the appropriate process for the extraction of lead from low-grade ore (impurity level is high)?

Explain the following:
$(a)$ $CO_2$ is a better reducing agent below $710 \ K$ whereas $CO$ is a better reducing agent above $710 \ K$.
$(b)$ Generally,sulphide ores are converted into oxides before reduction.
$(c)$ Silica $(SiO_2)$ is added to the sulphide ore of copper in the reverberatory furnace.
$(d)$ Carbon and hydrogen are not used as reducing agents at high temperatures for certain metals.
$(e)$ Vapour phase refining method is used for the purification of $Ti$.

Which one of the following reactions does not occur during the extraction of copper?

Steel contains