What are the constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires? Solder is an alloy of lead and tin. Low melting point of …
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why? It is because …
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them? It is easier to obtain metal from its oxide, …
What type of oxides are formed when non-metals combine with oxygen? When non-metals combine with oxygen, they form either acidic oxide or neutral oxide.
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte ? In this process, the impure metal is made the …
Name two metals, which will displace hydrogen from, dilute acids, and two metals, which will not. (i) Two metals which will displace hydrogen from dilute acids are: magnesium and aluminium. …
What are alloys? Alloys are homogeneous mixtures of two or more elements. The elements could be two metals, or a metal and a non-metal. An alloy is formed by first …
Which metals do not corrode easily? More reactive a metal is, more likely it is to be corroded. Therefore, less reactive metals are less likely to get corroded. This is …
What chemical process is used for obtaining a metal from its oxide? The chemical process used for obtaining a metal from its oxide is reduction. In this process, metal oxides …
Name two metals which, are found in nature in the free state. The metals at the bottom of the reactivity series are mostly found in free state. For example, gold, …