3. Give reasons for the following: (a) Copper cannot displace zinc from its salt solution. (b)/ Immersion rods pre made of metallic substances. (c) Phosphorous is stored under water.
Answers
Answer:
(a) In the reactivity series, zinc is more reactive than copper. A more reactive metal can replace a less reactive metal, but a less reactive metal cannot replace a more reactive metal. Thus, copper cannot displace zinc from its salt solution, while zinc can displace copper from its salt solution.
(b) Immersion rods are made up of metallic substances because metals are good conductors of heat and electricity. They get hot very soon and allow to passage of current and warm water.
(c) Phosphorus is a very reactive non-metal. It reacts with air and catches fire. However, it does not react with water. Hence, it can stored in water as it wont react with water.
Explanation:
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(a) Copper can not displace zinc from its salt-solution because copper is less reactive than zinc. A less reactive metal can not displace more reactive metal from its solution.
Sodium and Potassium are stored in Kerosene since they are very reactive. They quickly react in air and water
Explanation:
(b) Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. The immersion rod needs electric supply to get heated and; in turn; to heat liquids.
(c) White phosphorus is highly reactive, and spontaneously ignites at about 30°C in moist air. It is usually stored under water, to prevent exposure to the air.
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