The Periodic Table Quiz - ICSE Class 9 Chemistry
Free practice quiz: The Periodic Table (ICSE Class 9 Chemistry). 47 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following elements exhibits the highest ionization enthalpy in the third period of the periodic table?
- Sodium (Na)
- Magnesium (Mg)
- Aluminum (Al)
- Chlorine (Cl)
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Answer: D. Chlorine (Cl)
Ionization enthalpy generally increases across a period due to increasing effective nuclear charge, which holds the valence electrons more tightly. Chlorine has the highest effective nuclear charge in the third period, leading to the highest ionization enthalpy.
Which of the following oxides is amphoteric?
- Na₂O
- MgO
- Al₂O₃
- SO₂
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Answer: C. Al₂O₃
Amphoteric oxides are those that can react with both acids and bases. Sodium oxide (Na₂O) and magnesium oxide (MgO) are basic oxides. Sulfur dioxide (SO₂) is an acidic oxide. Aluminum oxide (Al₂O₃) is an amphoteric oxide, reacting with acids to form salt and water, and with bases to form salts.
Which property generally increases as we move down Group 1 of the periodic table?
- Electronegativity
- Ionization enthalpy
- Reactivity
- Electron affinity
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Answer: C. Reactivity
Reactivity of alkali metals (Group 1) increases down the group because the atomic size increases, and the valence electron is further from the nucleus and more easily lost. Electronegativity and ionization enthalpy decrease down the group, and electron affinity also generally decreases.
An element in Period 4 and Group 18 is:
- Argon (Ar)
- Krypton (Kr)
- Xenon (Xe)
- Radon (Rn)
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Answer: B. Krypton (Kr)
Period 4 corresponds to the filling of the fourth electron shell. Group 18 elements are noble gases. Krypton (Kr) has atomic number 36 and its electronic configuration is 2, 8, 18, 8, which places it in Period 4 and Group 18.
An element with 7 protons and 7 neutrons in its nucleus has an atomic number of:
- 7
- 14
- 0
- 1
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Answer: A. 7
The atomic number of an element is equal to the number of protons in the nucleus of an atom of that element. The number of neutrons affects the mass number but not the atomic number.