Question

Q.No: 4. Which of the following reactions involves the combination of two elements 1. CaO + CO2 -> CaCO3 2. 4Na + O2 -> 2Na2O 3. SO2 +(1/2)O2 -> SO3 4. NH3 + HCI -> NH4Cl​

Answer 1

Answer:

Correct option is 2

4Na+O

2

→2Na

2

O

4Na+O

2

⟶2Na

2

O

Here two element sodium and oxygen participate in the reaction and Na oxide to form sodium oxide.

All other reaction involves a combination of compounds.

Answer 2

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