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The video tutorial explains the classification of metals based on their chemical reactivity, particularly their ability to react with oxygen. It categorizes metals into three groups: highly reactive, moderately reactive, and weakly reactive. Highly reactive metals like sodium and potassium lose their shine quickly and are stored under kerosene. Moderately reactive metals such as aluminum, iron, and copper form a layer of rust when exposed to air for days. Weakly reactive metals, including gold and silver, are resistant to oxidation and are used in jewelry making.

Which of the following metals is stored under kerosene to prevent reaction with air?

• Iron

• Sodium

• Copper

• Gold

What happens to moderately active metals like iron when exposed to air for several days?

• They explode

• They become shiny

• They form a layer of rust

• They melt

Why is it necessary to paint large iron structures periodically?

• To prevent them from rusting

• To make them conduct electricity better

• To make them look attractive

• To increase their weight

Which of the following metals is least likely to react with oxygen?

• Aluminum

• Copper

• Sodium

• Gold

What is a common use for weakly active metals like platinum?

• Fuel

• Battery production

• Jewelry making

• Construction