Question

Cr is added as an alloying element into steel to increase
1) Hot hardness temperature
2) Wear resistance
3) Corrosion resistanc
4) Machinability

Answer 1

Answer is 1

HOPE IT HELPS

Answer 2

$\textbf{3}$

Chromium is added to an alloy in sense of making it corrosion resistive.

Chromium actually played as a layer, which their just prevent direct contact of oxygen from it.