Answer:

A) Solid phosphorus reacts with gaseous oxygen to produce solid diphosphorus pentaoxide.

B) Potassium oxide is an ionic compound formed by combining potassium and oxygen.

C) Calcium + oxygen → Calcium oxide.

D) In the presence of very high temperatures nitrogen and oxygen do react together to form nitric oxide.

Explanation:

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Verified answer

[tex]\bold\blue{Answers:-}[/tex]

[tex]\sf\orange{A:-}[/tex]

P +O2 = PO2.

– Po2 = phosphorous dioxide.

[tex]\sf\pink{B:-}[/tex]

4K+O2 =2k2O

–2k2O = potassium oxide

[tex]\sf\green{C:-}[/tex]

2Ca+O2 =2CaO

– 2CaO = calcium oxide

This is a combination reaction.

[tex]\sf\red{D:-}[/tex]

N2O2 = nitric oxide

At normal temperatures the oxygen and nitrogen gases do not react together. In the presence of very high temperatures nitrogen and oxygen do react together to form nitric oxide