If the boiling point of H2O is 373 K, the boiling point of H2S will be :

Options

A. greater than 300 K but less than 373 K
B. equal to 373 K
C. more than 373 K
D. less than 300 K

Explanation

To determine the boiling point of H2S in comparison to H2O, we need to analyze the intermolecular forces present in both substances.

### Step 1: Understand the boiling point of water (H2O)
The boiling point of water is given as 373 K. Water exhibits strong hydrogen bonding due to the presence of highly electronegative oxygen atoms, which can form hydrogen bonds with hydrogen atoms of neighboring water molecules.

### Step 2: Analyze H2S
H2S (hydrogen sulfide) has sulfur as the central atom instead of oxygen. Although sulfur is more electronegative than hydrogen, it is not as electronegative as oxygen. Therefore, H2S does not exhibit hydrogen bonding to the same extent as water does.

### Step 3: Identify the type of intermolecular forces in H2S
H2S primarily exhibits dipole-dipole interactions due to the polar nature of the H-S bond. However, these dipole-dipole interactions are weaker than the hydrogen bonds present in water.

### Step 4: Compare the boiling points
Since the boiling point of a substance is influenced by the strength of its intermolecular forces, and given that H2S has weaker dipole-dipole interactions compared to the strong hydrogen bonding in water, we can conclude that the boiling point of H2S will be lower than that of water.

### Conclusion
Thus, the boiling point of H2S will be less than 373 K.

**Final Answer: The boiling point of H2S will be less than 373 K.**

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