Which of the following combination of elementary substances may react to form a chemical compound made up of molecules? - c(s) and br2(i) -i2(s) and mg(s) -o2(g) and na(s) - all of them react to produce compounds made up of molecules

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Only C(s) and Br2(l)

Explanation: -

Ionic compounds are formed between metals and nonmetals.

We use the term molecule when covalent compounds are formed but not for ionic compounds. In the case for Na(s) and O2(g), an ionic compound is formed. Similarly between Mg (s) and I2(s) an ionic compound is formed.

Only between C(s) and Br2 (l) a covalent compound  gets formed. These compound is formed of molecules.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it