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NDA 2026
Exam
NDA
Year
2026
Subject
General Ability
Chapter
General Science

NDA 2026 · General Ability · General Science

1.7\,g of silver nitrate is dissolved in 100\,g of water, and...

1.7 g1.7\,\text{g} of silver nitrate is dissolved in 100 g100\,\text{g} of water, and 0.585 g0.585\,\text{g} of sodium chloride is dissolved in 100 g100\,\text{g} of water. Both are mixed and a chemical reaction occurs. 1.435 g1.435\,\text{g} of silver chloride and 0.85 g0.85\,\text{g} of sodium nitrate are formed. Which law of chemical combination is shown by the above reaction?

Options

  1. ALaw of multiple proportions
  2. BLaw of conservation of mass
  3. CLaw of reciprocal proportions
  4. DLaw of constant proportions

Correct answer

B. Law of conservation of mass

Step-by-step solution

Total mass of reactants = Mass of silver nitrate + Mass of water + Mass of sodium chloride + Mass of water

Total mass of reactants = 1.7+100+0.585+100=202.285 g1.7 + 100 + 0.585 + 100 = 202.285\,\text{g}

Total mass of products = Mass of silver chloride + Mass of sodium nitrate + Mass of water

Total mass of products = 1.435+0.85+200=202.285 g1.435 + 0.85 + 200 = 202.285\,\text{g}

Since the total mass of reactants is exactly equal to the total mass of products, this reaction demonstrates the law of conservation of mass.

Answer: Law of conservation of mass
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