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The electronic… (Class 10 Science SQP 2024-25, Q6)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2024-25: question 6

From the official CBSE sample question paper for 2024-25, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQMetals and Non-metals

The electronic configuration of three elements X, Y and Z are X- 2, 8, 7; Y- 2, 8, 2; and Z - 2, 8

  1. (A)Y and Z are metals
  2. (B)Y and X are non-metals
  3. (C)X is a non -metal and Y is a metal
  4. (D)Y is a non-metal and Z is a metal

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

Open one hint at a time and try again before the next.

Hint 1

Look at the number of electrons in the outermost shell of each element.

Hint 2

Atoms that lose electrons are metals; atoms that gain electrons are non-metals.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. X (2, 8, 7) has 7 valence electrons and tends to gain 1 electron, so X is a non-metal (chlorine). Y (2, 8, 2) has 2 valence electrons and tends to lose them, so Y is a metal (magnesium).

    ½ mark

  2. Z (2, 8) has a complete octet and is a noble gas (neon). The correct statement is option (C): X is a non-metal and Y is a metal.

    ½ mark

Answer: X is a non-metal and Y is a metal; option (C)

Where the marks are

  • Classifies the elements from their valence electrons and chooses (C) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Metals and Non-metals, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.