name the acid which can cut the iron rod
Any dilute acid will react with iron: 2Fe + 6H+ --> 2Fe3+(aq) + 3H2,(gas)
The physical shape doesn't influence what is is chemically. Pure iron (Fe) is an element regardless of the shape. Strictly speaking an iron rod is probably an alloy. Mostly iron, but with a dab of other elements to make it stronger and easier to shape.
Acid itself cannot generate electricity. The electricity is generated by the flow of the electrons. So we can use active metal & inactive medal with acid to generate electricity. For example. If you put a copper rod and a zinc rod in acid solution (for example, HCl), connect the two rods with a conductive wire (metal wire). The the electricity will be generated because the electrons will move from the Zinc (active) rod to the copper (inactive) rod
as oxide of iron is formed on the nail in contact with the environment
A baghdad battery works with an electrolyte solution , an iron rod , and a copper cylinder.
Any dilute acid will react with iron: 2Fe + 6H+ --> 2Fe3+(aq) + 3H2,(gas)
iron rod
You need the length of the rod to compute the weight. To do so, you can calculate the volume of the rod, which would be length*Pi*22 multiplied by the density of MS, which is 7.86 g/cm3, or simply 15.72(Pi)*length of the rod Mildsteel rod 40mm dia. = 9.85 kg per metre. I think that is what you asked.
A rod that is made out of iron.
If the rod is made from pure iron it is not a mixture.
Melting an iron rod is a physical change
No. Lead-acid batteries are made using lead which is immersed in an acid, usually sulfuric. Carbon batteries have a carbon rod core with zinc and copper. NiCad batteries are similar to carbon batteries, but a nickle-Cadmium rod are used. Lithium batteries are similar as well, but lithium is used.
8 mm iron rod 1 feet how much weight its come
Iron rod is a conductive material. You will get electrocuted if you touch a live wire with any conductive material like iron rod. It could be fatal to do so.
An expression of "firmness".
magnetism
I am not aware of a cast iron rod for oxy acetylene welding, I am for arc welding, For cast, I use a brazing rod, a brass or copper alloy, but what do I know. If there is a cast rod available, it would be the same process, get the cast you are welding hot almost to the point of melting, bring in the rod, heat it at the same place and bring both to a melting point. Work from that point along the crack or joint you are welding. ----------------------------------------------------------------------------------------------------------------- You need not use brazing rod for case iron welding. You get arc welding electrodes for cast iron. Use appropriate grade of rod for your case iron under welding.