Multiple Choice Question Answer IV — task. Science CBSE, Class 9.

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1. Neutron is a fundamental particle which have -

No charge and 1 unit mass
Have -1 unit charge and 1 unit mass
+1 unit charge and mass
Have no charge and mass

2. Number of unpaired electrons in \(1s^2\), \(2s^2\), \(2p^4\), -

2
1
4
0

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