Which of the following alloys contains copper and zinc?
A. Steel
B. Solder
C. Brass
D. Bronze
Answer: Option C
Solution (By JKExamLibrary)
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:
Elements in the same group (vertical column) have the same number of valence electrons, resulting in similar chemical properties. For example, all Group 1 elements have 1 valence electron (ns¹). The number of shells increases down the group. Atomic mass varies. This similarity was the basis for Mendeleev's grouping. Modern table uses atomic number for ordering.
Explanation:
DAP (diammonium phosphate) contains N (18%) and P₂O₅ (46%). Urea only N; MOP (muriate of potash) only K; SSP only P. NPK mixtures provide all three.
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