JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Hydrogen

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Hydrogen has three isotopes (a), (b) and (c). If the number of neutron(s) in (a), (b) and (c) respectively, are (x), (y) and (z), the sum of (x), (y) and (z) is:

(A)4
(B)3✓ Correct
(C)2
(D)1

Answer: (B)

Solution

Hydrogen's three isotopes are protium, deuterium and tritium, each with one proton but with

0

1

and

2

neutrons. So the neutron counts are

x = 0

y = 1

z = 2

, and

x + y + z = 0 + 1 + 2 = 3

JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Single correct option

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