The force that holds nucleons together in the nucleus is:
A. Strong nuclear force
B. Van der Waals force
C. Gravitational force
D. Electrostatic force
Answer: Option A
Solution (By JKSSB Mock Tests)
The strong nuclear force is the attractive force that binds protons and neutrons (nucleons) together in the nucleus, overcoming the electrostatic repulsion between protons. It is short-range and charge-independent. Electrostatic repulsion would otherwise blow the nucleus apart. Gravitational force is negligible at this scale. Van der Waals forces operate between molecules.
Explanation:
Salt (NaCl) dissolved in water increases the electrical conductivity of the electrolyte, facilitating the electrochemical corrosion process. This is why iron rusts faster in coastal areas and on roads treated with deicing salts. Dry air prevents rusting (needs moisture). Coating with paint blocks oxygen and moisture. Vacuum has no oxygen.
Explanation:
Silver (Ag) is a noble metal below hydrogen in the reactivity series and does not displace H₂ from dilute acids. Mg, Al, Fe are above H and react: Mg + 2HCl → MgCl₂ + H₂. However, Al reacts slowly initially due to oxide layer. Copper also doesn't react. The reactivity series determines acid reactivity.
Explanation:
There are three naturally occurring radioactive decay series: the Uranium series (4n+2), the Thorium series (4n), and the Actinium series (4n+3). The Neptunium series (4n+1) is an artificial series; its longest-lived isotope, Neptunium-237, has a half-life too short to have survived since the Earth's formation.
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