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West Bengal Madhyamik (Class 10) Class 10 Science — practice questions

Explore 30 free Class 10 Science questions in West Bengal Madhyamik (Class 10) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Class 10 Science questions and exercises with answers

Showing questions 1–30 of 30.

Dobereiner grouped elements with similar properties into sets of three called:Read the answer and worked solution →In a Dobereiner triad, the atomic mass of the middle element is roughly the:Read the answer and worked solution →Lithium, sodium and potassium have atomic masses 6.9, 23.0 and 39.0. The average of the first and last is:Read the answer and worked solution →Dobereiner's system failed because he could identify only how many triads?Read the answer and worked solution →In 1866 John Newlands arranged the known elements in order of increasing:Read the answer and worked solution →Newlands found every eighth element repeated the properties of the first, like notes in:Read the answer and worked solution →Newlands assumed that the total number of elements in nature was only:Read the answer and worked solution →The Law of Octaves broke down for heavier elements and was fully upset by the discovery of:Read the answer and worked solution →In 1913 Henry Moseley showed that the most fundamental property of an element is its:Read the answer and worked solution →The Modern Periodic Law says properties of elements are a periodic function of their:Read the answer and worked solution →The atomic number of an element gives the number of protons in its:Read the answer and worked solution →The Modern Periodic Table has how many vertical columns called groups?Read the answer and worked solution →All the elements in one group of the table share the same number of:Read the answer and worked solution →Going down a group, the number of occupied shells in the atoms:Read the answer and worked solution →All elements in one period of the table share the same number of:Read the answer and worked solution →Sodium, magnesium, aluminium, silicon, phosphorus, sulphur, chlorine and argon belong to period:Read the answer and worked solution →Moving from left to right across a period, the atomic radius of the elements:Read the answer and worked solution →Moving down a group, the atomic size of the elements:Read the answer and worked solution →The atomic radius of a hydrogen atom is about:Read the answer and worked solution →In the Modern Periodic Table the metals are found towards the:Read the answer and worked solution →Elements such as boron, silicon and germanium, intermediate in properties, are called:Read the answer and worked solution →Metals tend to lose electrons when forming bonds, so they are described as:Read the answer and worked solution →Catch the metalsRead the answer and worked solution →Pop the early attemptsRead the answer and worked solution →Run the periodic gatesRead the answer and worked solution →Slice the periodic termsRead the answer and worked solution →Across or downRead the answer and worked solution →Sort the classificationsRead the answer and worked solution →Type the numberRead the answer and worked solution →Periodic table bingoRead the answer and worked solution →

Worked practice questions

Dobereiner grouped elements with similar properties into sets of three called:

  1. Triads
  2. Trends
  3. Tracks
  4. Traces
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Correct answer: A. Triads

1. He searched for families of similar elements. 2. Each family he found held three members. 3. He called them triads. _Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._

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In a Dobereiner triad, the atomic mass of the middle element is roughly the:

  1. Average of volumes
  2. Average of others
  3. Average of shells
  4. Average of charges
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Correct answer: B. Average of others

1. The three are written in order of rising atomic mass. 2. The middle one sits halfway between the outer two. 3. So it is the average of the others. _Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._

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Lithium, sodium and potassium have atomic masses 6.9, 23.0 and 39.0. The average of the first and last is:

  1. 22.95
  2. 20.95
  3. 24.95
  4. 26.95
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Correct answer: A. 22.95

1. Add 6.9 and 39.0 to get 45.9. 2. Half of 45.9 is 22.95. 3. So the average is 22.95. _Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._

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More Chemistry topics

ChemistryPeriodic Classification of Elements