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To balance the following… (Class 10 Science 2024, Q1)

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ScienceCBSE Class 10 · Board exam 2024, set 31/5/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 1

Set in the CBSE Class 10 board exam of 2024, paper 31/5/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQChemical Reactions and Equations

To balance the following chemical equation, the values of the coefficients , and must be respectively:

  1. (A)4, 2, 2
  2. (B)4, 4, 2
  3. (C)2, 2, 4
  4. (D)2, 4, 2

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/5/1.

Hints

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

Hint 1

Count the atoms of each element on both sides.

Hint 2

Balance N first, then O; there is only one O₂.

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. Balanced equation: .

  2. Check: Zn 2 = 2; N 4 = 4; O: . So , option (C).

    1 mark

Answer: 2, 2, 4, option (C)

Where the marks are

  • Chooses (C) 2, 2, 4 (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 paper2024 board paper, set 31/5/1: 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.