[[1]] is the complete reaction of $Z n + N a O H →$

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Detailed Solution

Concept- The above-given equation is the reaction of metal with base. Generally, the acids react with metals and release the hydrogen gas. If the reaction of the base takes place with the metal, it forms salt and also releases hydrogen gas.
The acids, as well as the Bases both, react with metals. The bases also react with some certain metals, like zinc or aluminum to release the hydrogen gas.
The bases produce hydrogen gas when they react with metals such as zinc. When the sodium hydroxide reacts with the zinc, it produces the sodium zincate and releases hydrogen gas.
The complete reaction is as follows: