Naphthalene balls are obtained from coal...

Naphthalene balls are obtained from coal tar and are used as

mosquito repellant

honey bee repellant

moth repellant

snake repellant

Text Solution

AI Generated Solution

The correct Answer is:

**Step-by-Step Solution:** 1. **Identify the Source of Naphthalene Balls:** - Naphthalene balls are derived from coal tar. They can also be obtained from crude oil. 2. **Understand the Purpose of Naphthalene Balls:** - Naphthalene balls are primarily used for pest control. 3. **Specify the Type of Pests:** - They are particularly effective against moths and other insects. 4. **Explain the Mechanism:** - When naphthalene balls are placed in storage areas, such as under clothes, they release vapors that repel or kill moths and other insects. 5. **Clarify Misconceptions:** - Naphthalene balls are not effective against mosquitoes or bees, and they do not repel snakes. 6. **Conclude with the Correct Usage:** - Therefore, the correct answer is that naphthalene balls are used as moth repellents. **Final Answer:** Naphthalene balls are obtained from coal tar and are used as moth repellents. ---

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Select the correct statement(s). I. Natural gas is used for the manufacture of fertilisers. II. Petrochemicals are used in the manufacture of detergents. III. Naphthalene balls are obtained from coal tar.

I and Il only

III only

II and III only

I,II and III

Coal tar is a

black,thick liquid

dark,oily liquid

tough,porous and black substance

gas

Naphthalene can be separted from sand:

by sublimation

by distillation

by crystallisation

by using water as solvent