Which one of the following is an oxidation reduction reaction?

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Q: 54 (NDA-II/2018)

Which one of the following is an oxidation reduction reaction?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,1,7,3,2,1,2

keywords: 

{'oxidation reduction reaction': [0, 0, 0, 1], 'bacl2': [0, 0, 0, 1], 'cao': [0, 0, 0, 3], 'naoh': [0, 0, 1, 9], 'h2o': [0, 0, 2, 3], 'baso4': [0, 0, 0, 1]}

Option 1: NaOH + HCI ^ NaCI + H2O

This is a neutralization reaction between a base (NaOH) and an acid (HCl). It does not involve any change in oxidation states and therefore is not an oxidation-reduction reaction.

Option 2: CaO + H2O ^ Ca(OH)2

This is a combination reaction between calcium oxide (CaO) and water (H2O) to form calcium hydroxide (Ca(OH)2). It also does not involve any change in oxidation states and is not an oxidation-reduction reaction.

Option 3: 2Mg + O2 ^ 2MgO

This is an example of an oxidation-reduction reaction. Magnesium (Mg) is being oxidized because it is gaining oxygen from the oxygen molecule (O2) to form magnesium oxide (MgO). The oxidation state of magnesium increases from 0 to +2, indicating oxidation.

Option 4: Na2SO4 + BaCl2 ^ BaSO4 + 2NaCl

This is a precipitation reaction between sodium sulfate (Na2SO4) and barium chloride (BaCl2). It does not involve any change in oxidation states and is