If you spill a chemical toilet cleaning liquid on your hand, your first aid would be:
(1) vinegar
(2) aqueous NaOH
(3) aqueous NaHCO3
(4) aqueous NH3
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Ans. (3) aqueous NaHCO3
Sol. In toilet cleaning liquid the main constituent is HCl, which can cause skin burn so it should be treated with NaHCO3 which can easily consume the acid.
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