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Indian Navy 10+2 B.Tech Cadet Metals and Non-metals — practice questions

Explore 6 free Metals and Non-metals questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Metals and Non-metals questions and exercises with answers

Showing questions 1–6 of 6.

Iron nail dipped in copper sulfate solution shows colour change because:Read the answer and worked solution →In the formation of NaCl from Na and Cl, sodium:Read the answer and worked solution →Heating a sulfide ore strongly in excess air converts it to an oxide. This step is called:Read the answer and worked solution →Which one of the following properties is not generally exhibited by ionic compounds?Read the answer and worked solution →Stainless steel is very useful material for our life. In stainless steel, iron is mixed withRead the answer and worked solution →Which one of the following four metals would be displaced from the solution of its salts by other three metals?Read the answer and worked solution →

Worked practice questions

Iron nail dipped in copper sulfate solution shows colour change because:

  1. No reaction occurs
  2. Fe is more reactive than Cu
  3. Cu corrodes iron
  4. Cu is more reactive than Fe
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Correct answer: B. Fe is more reactive than Cu

Iron is above copper in the reactivity series, so it displaces copper from CuSO₄: Fe + CuSO₄ → FeSO₄ + Cu. Solution turns from blue to green; nail gets a brown coating.

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In the formation of NaCl from Na and Cl, sodium:

  1. gains an electron
  2. shares an electron
  3. loses an electron
  4. gains two electrons
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Correct answer: C. loses an electron

Na has 1 outer electron. It loses it to become Na⁺. Chlorine accepts the electron and becomes Cl⁻. The opposite charges attract.

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Heating a sulfide ore strongly in excess air converts it to an oxide. This step is called:

  1. calcination
  2. smelting
  3. roasting
  4. electrolysis
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Correct answer: C. roasting

Roasting = heating in excess air (for sulfides). Calcination = limited air (for carbonates). The aim of both is to obtain the oxide for the next reduction step.

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