Which subatomic particle has a mass of approximately 1.67 × 10⁻²⁷ kg and no charge?
A. Proton
B. Positron
C. Electron
D. Neutron
Answer: Option D
Solution (By JKSSB Mock Tests)
Neutron has mass approximately equal to proton (1.675 × 10⁻²⁷ kg) and no electric charge. Proton mass ~1.673 × 10⁻²⁷ kg, positive charge. Electron mass ~9.11 × 10⁻³¹ kg, negative charge. Positron is the antiparticle of electron, same mass, positive charge. Neutron's neutrality makes it important for nuclear stability.
Explanation:
Rusting involves anodic oxidation of iron (Fe → Fe²⁺ + 2e⁻) and cathodic reduction of oxygen (O₂ + 2H₂O + 4e⁻ → 4OH⁻) in the presence of water acting as electrolyte. CO₂ can form carbonic acid accelerating it, but not required. Nitrogen is inert. High temperature alone doesn't cause rusting without moisture and oxygen.
Explanation:
Ethanol, commonly known as ethyl alcohol, has the chemical formula C₂H₅OH. Methanol is CH₃OH. Acetic acid (ethanoic acid) is CH₃COOH, and propionic acid is C₂H₅COOH. Ethanol is widely used as a solvent, in alcoholic beverages, and as a biofuel.
Explanation:
Fractional distillation is the primary separation method in refining. Cracking breaks larger hydrocarbons into smaller ones (gasoline). Reforming alters structure to improve octane rating. Polymerisation combines small molecules. Fractional distillation separates based on boiling points in a fractionating column.
No comments yet. Be the first to start the discussion!