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Kerala SSLC (Class 10) Chemistry — practice by topic

Browse 119 questions across 4 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

Periodic Table & Periodic Properties (54)Chemical Reactions and Equations (37)Metallurgy (20)Elements, Compounds and Mixtures (8)

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The modern periodic law was given by whom?Read the answer and worked solution →How many groups and periods are in the modern periodic table?Read the answer and worked solution →Which group is known as the alkali metals?Read the answer and worked solution →Which group contains the noble gases?Read the answer and worked solution →

Worked practice questions

The modern periodic law was given by whom?

  1. Henry Moseley
  2. Dmitri Mendeleev
  3. John Dalton
  4. Johann Dobereiner
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Correct answer: A. Henry Moseley

1. Mendeleev arranged elements by atomic mass and gave the older periodic law. 2. Henry Moseley in 1913 showed that atomic number, not mass, decides periodicity. 3. The modern periodic law states that properties are periodic functions of atomic number. 4. So the law is credited to Moseley. _Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_

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How many groups and periods are in the modern periodic table?

  1. 7 groups and 18 periods
  2. 18 groups and 7 periods
  3. 8 groups and 7 periods
  4. 7 groups and 8 periods
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Correct answer: B. 18 groups and 7 periods

1. The modern periodic table has vertical columns called groups. 2. It has horizontal rows called periods. 3. There are 18 groups and 7 periods in the modern table. 4. Hence the correct answer is 18 groups and 7 periods. _Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_

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Which group is known as the alkali metals?

  1. Group 17
  2. Group 2
  3. Group 1
  4. Group 18
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Correct answer: C. Group 1

1. Alkali metals are highly reactive metals with one valence electron. 2. This valence-electron count places them in Group 1. 3. Examples include lithium, sodium and potassium. 4. Hence the alkali metals are in Group 1. _Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_

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