In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as
Assertion . A reversible reaction cannot be carried out in an open vessel.
Reason. When equilibrium is reached , no more vapour are formed .

Options

A. If both assertion and reason are true, and reason is the true explanation of the assertion .
B. If both assertion and reason are true but reason is the true explanation of the assertion .
C. If assertion is true, but reason is false.
D. If both assertion and reason are false .

Explanation

To solve the question regarding the assertion and reason statements, we will analyze each statement step by step.

### Step 1: Analyze the Assertion
The assertion states: "A reversible reaction cannot be carried out in an open vessel."

- A reversible reaction is one where the products can react to form the reactants again.
- In an open vessel, substances can escape into the atmosphere, especially if they are gases or volatile liquids. This can disrupt the equilibrium of the reaction.
- However, if the reactants and products are both in liquid state, the reaction can still be reversible in an open vessel, as the concentration of liquids does not change significantly with evaporation.
- Therefore, the assertion is **not universally true**; it depends on the states of the reactants and products.

### Step 2: Analyze the Reason
The reason states: "When equilibrium is reached, no more vapour are formed."

- At equilibrium, the rates of the forward and reverse reactions are equal, meaning that the concentrations of reactants and products remain constant.
- However, this does not mean that no vapor is formed; it means that the rate of vapor formation is equal to the rate of condensation back to liquid.
- Therefore, the reason is also **incorrect** because vapor can still be present and formed at equilibrium.

### Conclusion
Both the assertion and the reason are incorrect. Therefore, the correct answer is that both the assertion and reason are false.

### Final Answer
The correct answer is: **D** (Both Assertion and Reason are false).

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