If water samples are taken from a sea, river, cloud, lake, or snow, they will be found to contain hydrogen and oxygen in the ratio of 1:8 by weight. This indicates the law of:
Correct answer: A. Definite proportion
- A. Definite proportion
- B. Multiple proportion
- C. Reciprocal proportion
- D. None of above
Explanation
The law of constant composition states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source or method of preparation. A sample of H₂O from any source will have hydrogen and oxygen in a ratio of 1:8 by mass. (Mass ratio in H2O = 2:16 = 1:8).
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
Practise Fundamental Concepts of Chemistry
894 free Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Moles and Avogadro's Number questions
74g of calcium hydroxide will yield OH ions:
The sample of a compound contains 0:100g of hydrogen and 4.20 of nitrogen. The simplest formula for the compound is:
Calculate the number of moles of NaCl in 75.0g of table salt.
How many atoms are contained in one mole of Ca(OH)2?
74g of calcium hydroxide will yield OH- ions:
10 L of Cl2 gas reacts with 40L of H2 gas under same condiitions of temperature and pressure. How much volume of HCl should be produced?