Question

Please answer this question please ​

Answer 1

1. Oxygen

2. Hydrogen.

3. Reactivity series

4. Lead pb

1. Nitrogen

2. carbon dioxide

3. Endothermic reaction.

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Answer 2

Explanation:

Across

1. Oxygen

2. Hydrogen

3. Displacement

4. Lead

Down

1. Nitrogen

2. Carbon Dioxide

3. Endothermic

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