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Q.

What is the molecular formula of sodium hydroxide?

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a

NaOH

b

Na2O

c

NaCO3

d

Na(OH)2

answer is A.

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Detailed Solution

This chemical compound consists of sodium Na+ cations and hydroxide OH− anions. According to the criss-cross method, the numerical value of the ion charge of the two atoms is crossed over, which becomes the subscript of the other ion.  In this case, both ions have the same charge. So, the molecular formula of sodium hydroxide is NaOH.

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