Why nacl not expected to produce a gas when tested with hcl?

Explanation:

NaCl is a strong salt of strong base and strong acid whereas HCl is a strong acid.

In the solution both dissociates in the solution into their respective ions as shown below:

NaCl ⇒ Na⁺ + Cl⁻

HCl ⇒ H⁺ + Cl⁻

Hence, the ions Na⁺, Cl⁻ and H⁺ are formed and there is no scope of reaction between them for a gas to evolve. They remain in the hydrated state in water.

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answer; talc and gypsum;