Which alloy is used to make surgical instruments?

An electrolytic cell consists of
$(i)$ positively charged cathode
$(ii)$ negatively charged anode
$(iii)$ positively charged anode
$(iv)$ negatively charged cathode

State whether the following statement is true or false:
Iron does not burn on heating,but iron filings burn vigorously when sprinkled in the flame of a burner.

Which of the following gases is of brown colour?

Which of the following methods is $NOT$ used for the concentration of an ore?

Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.