(i) Which of the following sets contains only reactive metals?
(a) Li, Na, K, Rb (b) Na, Zn, Cd, Be
(c) Fe, Cr, Mn, Cu (d) Zn, Cu, P, Sn
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Curd contains lactic acid and vinegar contains acetic acid. Lime water, soap, and milk of magnesia are basic substances and grapes contain tartaric acid.
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