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SSC Selection Post 2023 PYQ — Question 28

SSC Selection Post - Higher Secondary Level 2023 - 27 June 2023 - Shift 3 • General Awareness • Q28

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What is the ratio by mass of hydrogen and oxygen in water?

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Correct answer: A

Explanation

The correct answer is Option 1 i.e. 1 : 8.

The ratio by mass of hydrogen to oxygen in water (H₂O) is: 1 : 8

Here's how it's calculated:

Molecular mass of water (H₂O):

  • Hydrogen (H) = 1 × 2 = 2 g/mol
  • Oxygen (O) = 16 g/mol
  • Total = 2 + 16 = 18 g/mol

So, in one molecule of water:

  • Mass of hydrogen = 2 g
  • Mass of oxygen = 16 g
  • Ratio (Hydrogen : Oxygen) = 2 : 16 = 1 : 8