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Consider the following… (Class 10 Science 2024, Q5)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 5

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section A, question 5, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q5 · 1 mark · MCQChemical Reactions and Equations

Consider the following Chemical equation :

In order to balance this chemical equation, the values of a, b, c and d must be

  1. (A)1, 6, 2 and 3
  2. (B)1, 6, 3 and 2
  3. (C)2, 6, 2 and 3
  4. (D)2, 6, 3 and 2

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

Start by balancing the Al atoms.

Hint 2

Then balance Cl, and finally use the O atoms to fix the number of water molecules.

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. Balance Al: 2 Al on the left, so (2 ). Balance Cl: Cl, so HCl.

  2. Balance O and H: 3 O come from , so . This gives 6 H, which matches the 6 HCl.

  3. Balanced equation: . So a, b, c, d = 1, 6, 2, 3, option (A).

    1 mark

Answer: 1, 6, 2 and 3, option (A)

Where the marks are

  • Obtains the balanced coefficients 1, 6, 2, 3 (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 31/3/1: 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.