Metals and Non-metals — Flashcards
Karnataka Board · Class 10 · Science
20 flashcards for Metals and Non-metals (Karnataka Board Class 10 Science) to test yourself on key terms and facts.
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A metal wire conducts electricity, but when you touch it during current flow, you get a shock. Why does this happen and how can you prevent it?
Answer
Metals are good conductors because their electrons can move freely. You get a shock because your body completes the electrical circuit. Prevention: Use insulated wires (covered with PVC/rubber) and av…
Why do we use aluminum and copper for making cooking utensils instead of iron or lead?
Answer
Aluminum and copper are excellent heat conductors, allowing even cooking. Iron rusts and affects food taste, while lead is toxic. Aluminum is lightweight and doesn't react with most foods. Copper cond…
What happens when you add zinc metal to copper sulfate solution? Write the reaction and explain the observation.
Answer
Zn + CuSO₄ → ZnSO₄ + Cu. The blue copper sulfate solution turns colorless, and reddish-brown copper metal is deposited. This happens because zinc is more reactive than copper (higher in reactivity ser…
Why is sodium kept immersed in kerosene oil in laboratories?
Answer
Sodium is extremely reactive and reacts vigorously with oxygen and water vapor in air, producing heat and catching fire. Kerosene oil prevents contact with air and moisture, keeping sodium safe. The r…
How do you test if a given solution contains ions and can conduct electricity?
Answer
Set up a circuit with battery, bulb, and two electrodes. Dip electrodes in the solution. If bulb glows, the solution contains ions and conducts electricity. Ionic compounds in solution dissociate into…
Why do ionic compounds have high melting and boiling points?
Answer
Ionic compounds have strong electrostatic forces of attraction between oppositely charged ions (ionic bonds). Large amounts of energy are needed to break these strong forces, resulting in high melting…
What is observed when magnesium ribbon is burned in air? Write the reaction and explain the product's nature.
Answer
Mg burns with dazzling white light: 2Mg + O₂ → 2MgO. White ash (magnesium oxide) is formed. When dissolved in water: MgO + H₂O → Mg(OH)₂. Testing with litmus shows it's basic (turns red litmus blue).
Malleability and Ductility
Answer
Malleability: Ability of metals to be beaten into thin sheets. Example: Gold can be hammered into extremely thin gold leaf. Ductility: Ability to be drawn into thin wires. Example: 1 gram of gold can …
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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