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Which of the following substances cannot act as both acid as well as a base?
  • a)
    amphoteric substance
  • b)
    amphiprotic substance
  • c)
    ampholyte
  • d)
    protophilic
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which of the following substances cannot act as both acid as well as a...
Amphoteric or amphiprotic substance or ampholytes are the substances which act as an acid as well as a base and example for this is water. It acts as an acid with Ammonia and base with acetic acid.
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Which of the following substances cannot act as both acid as well as a...

Protophilic substance cannot act as both acid and base

Protophilic substances refer to molecules or ions that are capable of accepting a proton but not donating a proton. This means that they can act as bases by accepting a proton, but they cannot act as acids by donating a proton.

Amphoteric substance
- Amphoteric substances are capable of acting as both an acid and a base depending on the reaction conditions. They can either donate or accept a proton, making them versatile in their reactivity.

Amphiprotic substance
- Amphiprotic substances are molecules or ions that can both donate and accept a proton. They can act as both an acid and a base in different chemical reactions.

Ampholyte
- Ampholytes are substances that can behave as both an acid and a base depending on the medium they are in. They can donate or accept protons in different situations.

In conclusion, while amphoteric substances, amphiprotic substances, and ampholytes can all act as both acids and bases, protophilic substances lack the ability to donate protons and therefore cannot act as acids.
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Two scientists wanted to test the solubility of different substances. Solubility is a measure of how many moles of a given substance (known as the solut e) can dissolve in a given volume of another substance (known as the solvent). The solvent can also be thought of as the substance present in greater amount, while the solute can be seen as the substance present in lesser amount. The scientists performed the following experiments to investigate this property.Experiment 1The scientists tested the number of moles of several substances that could be completely dissolved in 50mL of water at various temperatures. They made their solutions by slowly adding amounts of each substance to beakers sitting on a hot plate containing water and a stirring rod until no more of the substance dissolved in the solution. The beakers were weighed before and after the additions and the difference in mass was calculated to be the added mass of the substance. The researchers then calculated the number of moles that dissolved for each trial using the molecular mass and the recorded mass for each trial. Results are recorded in Table 1.Table 1Experiment 2In this experiment, the scientists wanted to test the solubility of NaCl in a variety of liquids at several temperatures. Their procedure was similar to that of Experiment 1, but with a range of liquids and only one solid. The results are compiled in Table 2.Table 2Q.In Experiment 2, which of the following combinations of temperature and solvent dissolved the greatest number of moles of NaCl?

Two scientists wanted to test the solubility of different substances. Solubility is a measure of how many moles of a given substance (known as the solut e) can dissolve in a given volume of another substance (known as the solvent). The solvent can also be thought of as the substance present in greater amount, while the solute can be seen as the substance present in lesser amount. The scientists performed the following experiments to investigate this property.Experiment 1The scientists tested the number of moles of several substances that could be completely dissolved in 50mL of water at various temperatures. They made their solutions by slowly adding amounts of each substance to beakers sitting on a hot plate containing water and a stirring rod until no more of the substance dissolved in the solution. The beakers were weighed before and after the additions and the difference in mass was calculated to be the added mass of the substance. The researchers then calculated the number of moles that dissolved for each trial using the molecular mass and the recorded mass for each trial. Results are recorded in Table 1.Table 1Experiment 2In this experiment, the scientists wanted to test the solubility of NaCl in a variety of liquids at several temperatures. Their procedure was similar to that of Experiment 1, but with a range of liquids and only one solid. The results are compiled in Table 2.Table 2Q.Which of the following correctly ranks the solutes from Experiment 1 in decreasing order of solubility in water at 50C?

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Which of the following substances cannot act as both acid as well as a base?a)amphoteric substanceb)amphiprotic substancec)ampholyted)protophilicCorrect answer is option 'D'. Can you explain this answer?
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