To determine which statement could be correct, we need to consider the separation process described: mixing two substances, filtering out one, and then heating the remaining liquid to remove water and leave the other substance.
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The first two options imply a reaction between sodium and chloride to form sodium chloride (table salt). However, sodium and chloride do not mix to form a solution that can be separated; they react, and the result is solid sodium chloride. Therefore, these options are not correct.
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The second pair of options presents the idea that substance A is alcohol and substance B is salt. Alcohol (which is soluble in water) can be separated from salt (which is also soluble) using filtration. If water is added, salt dissolves while alcohol does not, allowing for filtration, and the remaining liquid (water plus salt) can then be evaporated to leave behind salt. This option seems plausible.
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The third pair suggests that substance A is rice and substance B is sugar. Rice would generally require boiling to separate from water, and it cannot be filtered out directly when both are dissolved. This scenario does not align with the separation method described.
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The last option states that both substances are salts. If both substances were salt, they wouldn't need to go through the described separation process since they wouldn’t differentiate in solution.
From the reasoning above, the correct statements are:
- Substance A is alcohol, and substance B is salt.
This option aligns with the separation process mentioned, where a liquid mixture is formed, and one substance can be filtered out while the other one can be evaporated from water.