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ICSE Class 9 Chemistry — practice by topic

Browse 84 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

The Periodic Table (28)Periodic Table (27)The Language of Chemistry (27)Atomic Structure (26)Language of Chemistry (21)

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The atomic number of an element equals its number of:Read the answer and worked solution →Mass number of an atom is the sum of its:Read the answer and worked solution →Which is the charge on a proton?Read the answer and worked solution →Mass of a proton compared with that of an electron is:Read the answer and worked solution →

Worked practice questions

The atomic number of an element equals its number of:

  1. Valence electrons
  2. Neutrons
  3. Protons plus neutrons
  4. Protons
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Correct answer: D. Protons

1. Atomic number Z is the count of protons in the nucleus. 2. It uniquely identifies an element. 3. Mass number A = protons + neutrons. 4. So atomic number equals number of protons. _Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_

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Mass number of an atom is the sum of its:

  1. Protons and neutrons
  2. Protons and electrons
  3. Electrons and neutrons
  4. Electrons only
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Correct answer: A. Protons and neutrons

1. Mass number A counts heavy particles in the nucleus. 2. Electrons are extremely light and ignored in A. 3. So A = protons + neutrons. 4. Often written as 'A = p + n'. _Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_

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Which is the charge on a proton?

  1. -1.6 * 10^-19 C
  2. Zero
  3. +1.6 * 10^-19 C
  4. +2.0 * 10^-19 C
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Correct answer: C. +1.6 * 10^-19 C

1. A proton carries one elementary positive charge. 2. The value of one elementary charge is 1.6 * 10^-19 coulomb. 3. So the proton charge is +1.6 * 10^-19 C. 4. An electron carries the same magnitude but with negative sign. _Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_

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