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NDA Materials: Metals and Non-Metals — practice questions

Explore 20 free Materials: Metals and Non-Metals questions in NDA Science. Open each question or exercise to read its content, reference answers and available explanation.

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Materials: Metals and Non-Metals questions and exercises with answers

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CLASS10 · Chemistry · pH Scale — Gap FillRead the answer and worked solution →pH of pure water at 25 °C is:Read the answer and worked solution →The salt formed from NaOH + HCl is:Read the answer and worked solution →pH of the stomach (gastric juice) is approximately:Read the answer and worked solution →Tooth enamel is made of:Read the answer and worked solution →Which of the following metal oxides is amphoteric (reacts with both acids and bases)?Read the answer and worked solution →Arrange the following metals in decreasing order of reactivity as verified in your syllabus reactivity seriesRead the answer and worked solution →Which of these metals does NOT react with dilute HCl to release hydrogen gas?Read the answer and worked solution →Rusting of iron requires the simultaneous presence ofRead the answer and worked solution →The alloy called brass is composed ofRead the answer and worked solution →The metal that is stored under kerosene to protect it from air isRead the answer and worked solution →Metals are generallyRead the answer and worked solution →The reaction between iron and copper(II) sulphate solution is an example ofRead the answer and worked solution →Which of the following is a non-metal that is a LIQUID at room temperature?Read the answer and worked solution →The process of coating iron/steel articles with a thin layer of zinc to prevent rusting is calledRead the answer and worked solution →An ore of iron that is best in terms of iron content and magnetic properties As per your syllabus, isRead the answer and worked solution →When zinc is added to dilute sulphuric acid, the gas evolved isRead the answer and worked solution →The most abundant metal in the Earth's crust isRead the answer and worked solution →The reaction of sodium with water at room temperature isRead the answer and worked solution →Sort: metal or non-metalRead the answer and worked solution →

Worked practice questions

CLASS10 · Chemistry · pH Scale — Gap Fill

Read exercise and reference answers
Missing parts
  1. Answer
    7
    Choices
    1. 6
    2. 7
    3. 8
    4. 14
  2. Answer
    7
    Choices
    1. 5
    2. 6
    3. 7
    4. 10
Complete the statement
Pure water has pH {0}. A pH below {1} indicates an acidic solution.
Instructions
Fill the basic pH facts.

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pH of pure water at 25 °C is:

  1. 1
  2. 7
  3. 14
  4. 0
Show answer and solution

Correct answer: B. 7

1. Pure water: [H⁺] = [OH⁻] = 10⁻⁷ M. 2. pH = −log [H⁺] = −log 10⁻⁷ = 7 (neutral). 3. pH < 7 = acidic; pH > 7 = basic. _Source: syllabus Science Ch 2 §2.2 pH Scale_

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The salt formed from NaOH + HCl is:

  1. Sodium oxide (Na₂O)
  2. Sodium chloride (NaCl)
  3. Sodium hydride (NaH)
  4. Sodium bicarbonate (NaHCO₃)
Show answer and solution

Correct answer: B. Sodium chloride (NaCl)

1. Strong acid + strong base → neutral salt + water. 2. NaOH + HCl → NaCl + H₂O. 3. Resulting solution has pH ≈ 7. _Source: syllabus Science Ch 2 §2.1.3 Neutralisation_

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