Which of the following alloys contains copper and zinc?
A. Bronze
B. Solder
C. Brass
D. Steel
Answer: Option C
Solution (By JKSSB Mock Tests)
Brass is an alloy of copper (Cu) and zinc (Zn). Proportions vary to give different properties; common brass is 70% Cu, 30% Zn. Bronze is primarily Cu and Sn (tin). Solder is Pb and Sn. Steel is Fe with C and other elements. Brass is used for musical instruments, plumbing, and decorative hardware due to its gold-like appearance and corrosion resistance.
Explanation:
Boyle's law: PV = constant (at fixed T and n). So P ∝ 1/V. If volume is doubled, pressure halves. Charles' law relates V and T; Graham's law relates diffusion rate to molar mass.
Explanation:
Fractional distillation is the primary separation method in a petroleum refinery, where crude oil is heated and components separated based on boiling points. Cracking breaks larger molecules into smaller ones. Refining includes many processes including distillation. Polymerisation is joining molecules. Fractional distillation yields petrol, kerosene, diesel, etc.
Explanation:
Faraday's First Law of Electrolysis states that the mass of a substance deposited or liberated at an electrode is directly proportional to the total charge (Q) passed through the electrolyte (m = ZQ, where Z is the electrochemical equivalent). The Second Law relates mass to equivalent weight.
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