Yes.
Lemon has acid content and when metal gets into contact with it, rust will be formed.
A paperclip cannot rust because rust is the oxidation of iron or steel as a result with interaction with water or air. Therefore a paperclip cannot rust because it is made out of iron or steel. It is made out of aluminum.
Paper clips are made from low carbon steel then plated with solution to prevent rusting. If you want to test this sand off the side of a clip and hang half way it in a glass of water or coke and you will see rust in a short time
Lemonade
Well , A penny is copper and therefor will not rust but corrode . Many paper clips are fake metal and will not rust either . But yes it will effect it .
A nail soaked in lemonade looks clean if it has rust. It will be cleaner that it is normally.
bleach or vinegar
no
Most common paper clips are steel and conduct electricity. Some clips are made of plastic or have thin plastic coatings to reduce rust and these will not conduct electricity.yes
Car magnets doesn't cause rust.
pennies don't rust, they're made of cooper, rust is iron-oxide (meaning it has iron and oxygen in it). But copper oxidises (tarnishes). so a liquid with a high oxygen content would work
An ordinary steel paper clip will crumble into rust within a year or so, depending on the moisture content of the soil. They are seldom given any real corrosion protection, because they are designed to hold dry things together.
Something that is rust resistant will not rust easily; minor exposure to water will not cause it to rust. Something that is rust proof will not rust.