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No verified paper has been uploaded for PPSC-PMS Paper Chemistry 2005 MCQs yet. The MCQs below are drawn from the Chemistry subject category.
Ionization potential is the minimum energy required to remove an electron from an atom, resulting in a positively charged ion.
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Molecules with unpaired electrons exhibit paramagnetic behavior due to the presence of unpaired spins, which are attracted to magnetic fields. This distinguishes them from diamagnetic substances that have all electrons paired and are weakly repelled by magnetic fields.
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Melting points generally increase down Group VII-A (halogens) due to increasing atomic size and stronger London dispersion forces between atoms. These stronger forces require more energy to overcome, leading to higher melting points.
Nitrogen (N) has a higher first ionization energy due to its half-filled p-subshell configuration, which provides extra stability. This makes it harder to remove an electron from N compared to the other options.
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The atomic bomb dropped on Nagasaki, Japan, released an enormous amount of energy, equivalent to around 20 kilotons of TNT. This massive release of energy caused widespread destruction and loss of life.
Among the given options, the neutron has the greatest mass. A proton is slightly less massive than a neutron, while an electron is much lighter. Thus, the neutron is the heaviest subatomic particle listed.
The mass of one mole of an electron is extremely small, approximately 0.55 u (unified atomic mass units), which is the standard unit for measuring the mass of particles.
