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A metal ribbon 'X' burns in… (Class 10 Science 2023, Q3)

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ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 3

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQChemical Reactions and Equations

A metal ribbon 'X' burns in oxygen with a dazzling white flame forming a white ash 'Y'. The correct description of X, Y and the type of reaction is :

  1. (A)X = Ca ; Y = CaO ; Type of reaction = Decomposition
  2. (B)X = Mg ; Y = MgO ; Type of reaction = Combination
  3. (C)X = Al ; Y = Al_2O_3 ; Type of reaction = Thermal decomposition
  4. (D)X = Zn ; Y = ZnO ; Type of reaction = Endothermic

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

Recall the ribbon burnt in the Class 10 activity on chemical reactions.

Hint 2

Count how many products form from the reactants.

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. Magnesium ribbon burns with a dazzling white flame and forms white MgO: .

  2. Two reactants form one product, so this is a combination reaction. Option (B) is correct.

    1 mark

Answer: X = Mg, Y = MgO, combination, option (B)

Where the marks are

  • Identifies Mg/MgO and combination reaction (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Chemical Reactions and Equations, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/4/1: 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.