Atoms, Molecules and Nuclei Test

Result

Atoms, Molecules and Nuclei Test - 1

Score
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Rank
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Weekly Quiz Competition

Question 1
1 / -0

The binding energies for nuclei ₁H¹, ₂He⁴, ₂₆Fe⁵⁶ and ₉₂U²³⁵ are 2.22, 28.3, 492 and 17.86 MeV, respectively. The most stable nucleus is

A
₁H¹

B
₂He⁴

C
₂₆Fe⁵⁶

D
₉₂U²³⁵

Solution

As the binding energy of Fe⁵⁶ is highest, so the most stable nucleus will be₂₆Fe⁵⁶.
Question 2
1 / -0

The binding energy per nucleon of ₁H² is 1.1 MeV and binding energy per nucleon of ₂He⁴ is 7 MeV. The energy released when two ₁H² combine to form ₂He⁴ is

A
6.8 MeV

B
30.2 MeV

C
23.6 MeV

D
None of these

Solution

Energy Absorbed to break apart 2 ₁H² atoms = 1.1 × 4 = 4.4 MeV
Energy Released in formation of 1 ₂He⁴ atom = 7 × 4 = 28 MeV
Hence, energy released = (28 - 4.4) MeV = 23.6 MeV