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NTSE Chemistry — practice by topic

Browse 60 questions across 5 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Chemistry (60)Carbon and its Compounds (30)Chemical Bonding (30)NTSE Science (30)Olympiad Science (30)

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An atom is stable when its valence shell holds a full set of electrons called an:Read the answer and worked solution →To reach that stable arrangement, atoms may lose, gain or:Read the answer and worked solution →Two hydrogen atoms joining together form a molecule of an:Read the answer and worked solution →Hydrogen and chlorine atoms joining together form a molecule of a:Read the answer and worked solution →

Worked practice questions

An atom is stable when its valence shell holds a full set of electrons called an:

  1. Octet
  2. Orbit
  3. Offset
  4. Outlet
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Correct answer: A. Octet

1. A full outer shell leaves nothing to gain or lose. 2. For most atoms that means eight electrons. 3. That full set is an octet. _Source: syllabus Science Class IX, Chapter 9, Atomic Foundations of Matter._

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To reach that stable arrangement, atoms may lose, gain or:

  1. Shuffle
  2. Share
  3. Shrink
  4. Shatter
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Correct answer: B. Share

1. Losing and gaining are two of the three routes. 2. The third lets two atoms use the same electrons. 3. That third route is sharing. _Source: syllabus Science Class IX, Chapter 9, Atomic Foundations of Matter._

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Two hydrogen atoms joining together form a molecule of an:

  1. Element
  2. Emulsion
  3. Equation
  4. Extract
Show answer and solution

Correct answer: A. Element

1. Both atoms are the same kind. 2. No second element takes part. 3. So it is a molecule of an element. _Source: syllabus Science Class IX, Chapter 9, Atomic Foundations of Matter._

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