Which subatomic particle has a mass of approximately 1.67 × 10⁻²⁷ kg and no charge?
A. Positron
B. Electron
C. Proton
D. Neutron
Answer: Option D
Solution (By JKExamLibrary)
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:
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂↑. Carbon dioxide turns limewater milky. This is a test for carbonates and bicarbonates. The reaction is used in laboratory preparation of CO₂.
Explanation:
Haber process: N₂ + 3H₂ ⇌ 2NH₃ using finely divided iron catalyst with promoters (K₂O, Al₂O₃). Pt in Ostwald for HNO₃, V₂O₅ in Contact for H₂SO₄, Ni in hydrogenation.
Explanation:
Cracking is a petrochemical process where complex, heavy hydrocarbon molecules are broken down (cleaved) into lighter, more valuable molecules like gasoline and alkenes. This is achieved by applying high temperatures and pressures, often in the presence of a catalyst (catalytic cracking).
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