Sea water is trapped in shallow pans and allowed to evaporate under sunlight, leaving behind crude salt. This is then purified. Distillation gives pure water, not salt.
Explanation:
Silver has the highest thermal conductivity, followed by copper. It's also the best electrical conductor. Copper is more commonly used due to cost.
Explanation:
Graphite is used in electrodes (due to electrical conductivity) and as a moderator in nuclear reactors (to slow down neutrons). It is chemically stable and can withstand high temperatures. Diamond is an insulator. Fullerene is a nanomaterial. Charcoal is used as adsorbent and fuel. Graphite blocks are used in RBMK reactors (like Chernobyl) and in advanced gas-cooled reactors.
Explanation:
Reactivity series order: Na > Zn > Fe > Cu. Sodium (alkali metal) is extremely reactive, reacting violently with water. Copper is low in the series, hence used for water pipes.
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