Formalin is 37% formaldehyde in water solution. Formaldehyde is soluble in water because it is alan* polar covalent compound. non-polar covalent compound. ionic compound. strong electrolyte. When sodium reacts with water, the products are (a) sodium oxide, (b) hydrogen gas, (c) sodium hydroxide. (c) oxygen gas a and b b and c O c and d a and d Which of the following group 1 elements has the lowest melting point? * Na

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