Every Book Back multiple-choice question from Periodic Classification of Elements (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
The number of periods and groups in the periodic table are ______.
- A. 6, 16
- B. 7, 17
- C. 8, 18
- D. 7, 18Correct
Explanation. The modern periodic table organizes chemical elements into horizontal rows known as periods and vertical columns called groups. There are seven periods and eighteen groups in total.
Q2
The basis of modern periodic law is ______.
- A. atomic numberCorrect
- B. atomic mass
- C. isotopic mass
- D. number of neutrons
Explanation. Modern periodic law states that the properties of chemical elements are periodic functions of their atomic numbers. Hence, the modern periodic table is organized by increasing atomic number.
Q3
_____ group contains the member of halogen family.
- A. 17thCorrect
- B. 15th
- C. 18th
- D. 16th
Explanation. The halogen family, which includes elements like fluorine, chlorine, bromine, and iodine, is located in group seventeen of the modern periodic table.
Q4
_____ is a relative periodic property.
- A. atomic radii
- B. ionic radii
- C. electron affinity
- D. electronegativityCorrect
Explanation. Electronegativity is a relative periodic property because it measures an atom's relative tendency to attract a shared pair of electrons in a covalent bond and has no physical units.
Q5
Chemical formula of rust is ______.
- A. FeO.xH2O
- B. FeO4.xH2O
- C. Fe2O3.xH2OCorrect
- D. FeO
Explanation. Rust is chemically known as hydrated ferric oxide. Its chemical formula is Fe2O3.xH2O, which forms when iron reacts with oxygen and moisture.
Q6
In the alumino thermic process the role of Al is _____.
- A. oxidizing agent
- B. reducing agentCorrect
- C. hydrogenating agent
- D. sulphurising agent
Explanation. In the alumino thermic process, aluminium acts as a reducing agent because it has a strong affinity for oxygen and reduces metal oxides to their respective molten metals.
Q7
The process of coating the surface of metal with a thin layer of zinc is called ______.
- A. painting
- B. thinning
- C. galvanizationCorrect
- D. electroplating
Explanation. Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting, as zinc corrodes preferentially to protect the underlying metal.
Q8
Which of the following inert gases has 2 electrons in the outermost shell?
- A. HeCorrect
- B. Ne
- C. Ar
- D. Kr
Explanation. Helium is an inert gas that has only one electron shell. This single valence shell is completely filled with two electrons, satisfying its stable configuration.
Q9
Neon shows zero electron affinity due to ______.
- A. stable arrangement of neutrons
- B. stable configuration of electronsCorrect
- C. reduced size
- D. increased density
Explanation. Neon is a noble gas with a completely filled valence shell. Because of this highly stable electronic configuration, it has no tendency to accept additional electrons, resulting in zero electron affinity.
Q10
______ is an important metal to form amalgam.
- A. Ag
- B. HgCorrect
- C. Mg
- D. Al
Explanation. An amalgam is a specific type of alloy formed by mixing mercury with another metal. Mercury is the primary and essential component required to form any amalgam.
About these Periodic Classification of Elements questions
These are the Book Back multiple-choice questions for Periodic Classification of Elements from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Periodic Classification of Elements?
This chapter has 10 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Periodic Classification of Elements book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
