(1) The reaction for producing hydrogen sulfide gas can be expressed by the chemical equation: FeS+H2SO═FeSO4+H2S↑;

(2) In the laboratory, the reaction of producing hydrogen sulfide gas is Hydrogen gas uses solid ferrous sulfide (FeS) and dilute sulfuric acid, so a solid-liquid type generator B that does not require heating is selected;

(3) Since hydrogen sulfide gas can be dissolved in water, drainage cannot be used Method to collect hydrogen sulfide gas;

(4) Because the aqueous solution of hydrogen sulfide gas is acidic, it can be verified with purple litmus test solution, because purple litmus test solution turns red when exposed to acid;

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(5) Since H2S gas is acidic when dissolved in water, sodium hydroxide solution can be used to neutralize excess H2S gas.

The answer is: (1) FeS+H2SO═FeSO4+H2S↑; (2) B; (3) Can be dissolved in water; (4) Purple litmus solution; (5) Hydroxide sodium.