JEE Main 2017 — Some Basic Concepts Of Chemistry Question with Solution
From: JEE Main 2017 (Offline)
Question
The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon
(22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all
1H atoms are replaced by 2H atoms is:
Choose an option
Show full solutionCorrect option: B
Correct answer
B7.5 kg
Step-by-step explanation
Given that weight of human adult is = 75 kg
Among those 75 kg, 10% is Hydrogen(1H).
Mass of 1H = = 7.5 kg
Now when every 1H atom is replaced by 2H atom then weight of every atom is become double. So total weight of 2H becomes = 27.5 = 15 kg.
So the weight gain by the person = 15 - 7.5 = 7.5 kg
Among those 75 kg, 10% is Hydrogen(1H).
Mass of 1H = = 7.5 kg
Now when every 1H atom is replaced by 2H atom then weight of every atom is become double. So total weight of 2H becomes = 27.5 = 15 kg.
So the weight gain by the person = 15 - 7.5 = 7.5 kg
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Some Basic Concepts Of Chemistry chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2017, covering the Some Basic Concepts Of Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.