Because it is a TIN coating on the inside of cans of food {today replaced by Teflon/plastic} with the majority of metal comprising of steel.
Some non-magnetic metals: aluminium, copper, lead, tin, titanium, zinc, brass, bronze, gold, and silver
Some do and some don't
no
egg beater,trucks,cars,clocks and tin openers
Not to pure tin. Magnets stick to things with iron in them.
Because tin cans had already been invented but there was no easy way to open them.
They are niobium-titanium or niobium-tin intermetallic compounds.
Magnets attract magnetic materials such as iron. Magnets either attract or repel other magnets depending on the polarity. Magnets repel diamagnetic materials. Most diamagnetic materials (bismuth, diamond, graphite, silver) are only weakly repelled. Super conductors are strongly diamagnetic, and are more strongly repelled.
permeability of nonmagnetic medium equal μο
If you mean an electric can opener, then yes. The electric motor contains an electromagnet, and the cutting arm contains a magnet to lift the can into place and hold the lid. But manual can openers usually don't, unless they were made to double as refrigerator magnets. You usually see that with bottle openers rather than can openers.
NO
No magnets only stick to iron. (Magnets will also stick to nickel) yes tin is metal. tin is a low-melting, malleable, ductile metallic element nearly approaching silver in color and luster: used in plating and in making alloys, tinfoil, and soft solders. Symbol: Sn; atomic weight: 118.69; atomic number: 50; specific gravity: 7.31 at 20°C.