The figure given below represents the experiment carried out between conc. sulphuric acid and sodium chloride, which react with each other to form HCl gas.Blue litmus paper is brought near the mouth of the delivery tube to check the presence of HCl acid but no change is observed in the color of litmus paper because: * 1 point a. The litmus paper used is dry b. The litmus paper used is moist c. Blue litmus paper does not change its color with an acid d. The litmus paper is kept very close to the mouth of the delivery tube
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The answer is a. The litmus paper used is dry.
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