18. Which pair of elements is most apt to form A) aluminum, oxygen B) magnesium,

Question

18. Which pair of elements is most apt to form A) aluminum, oxygen B) magnesium, iodine C) sulfur, fluorine D) potassium, lithium E) barium, bromine a molecular compound with each other? 19 Barium reacts with a polyatomic ion to form a compound with the general formula Ba30x)2 What would be the most likely formula for the compound formed between sodium and the polyatomic ion X? A) NaX B) Na2X C) Na2X2 E) Na3X2 20, A certain mass of carbon reacts with 128 g of oxygen to form carbon monoxide. _ - grams of oxygen would react with that same mass of carbon to form carbon dioxide, according to the law of multiple proportions A) 25.6 B) 64.0 C) 128 D) 1280 E) 256

Explanation / Answer

Ans 18 : C) sulfur , fluorine

The molecular compounds are the ones that are made up of non metals. Since here both the elements sulfur and fluorine are non metals , the compound formed from them , will be a molecular compound. When metal and non metal unite , they form an ionic compound.

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