when hydrogen burns in oxygen water is formed; when electricity is passed through water hydrogen and oxygen is given out. Name the type of chemical change involved in two cases.

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Solution

Both are chemical changes as they are irreversible and chemical composition gets changed.

The formation of water is a combination reaction.
2 H₂ + O₂ ---- 2 H₂O

The electrolysis of water to give hydrogen and oxygen is a decomposition reaction.

2 H₂O ----- 2 H₂ + O₂

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when hydrogen burns in oxygen water is formed; when electricity is passed through water hydrogen and oxygen is given out. Name the type of chemical change involved in two cases.

Both are chemical changes as they are irreversible and chemical composition gets changed. The formation of water is a combination reaction. 2 H2 + O2 ---- 2 H2O The electrolysis of water to give hydrogen and oxygen is a decomposition reaction. 2 H2O ----- 2 H2 + O2

Both are chemical changes as they are irreversible and chemical composition gets changed.

The formation of water is a combination reaction.
2 H₂ + O₂ ---- 2 H₂O

The electrolysis of water to give hydrogen and oxygen is a decomposition reaction.

2 H₂O ----- 2 H₂ + O₂