Which alloy is used to prepare surgical instruments?

What is the chemical formula of rust?

Which alloy is used to solder electric wires?

During which reaction is dihydrogen gas not produced under normal conditions?

Generally,in what forms are the elements present in the lithosphere?

Provide one exception for each of the following general statements:
$(i)$ Metals are lustrous.
$(ii)$ Metals are solids at room temperature.
$(iii)$ Metals have high melting points.
$(iv)$ Non-metals are non-lustrous.
$(v)$ Non-metals are insulators or non-conductors of electricity.