Question
Question: Naphthalene balls are prepared from which of the natural resources? A– Coke B– Coal tar C– Pet...
Naphthalene balls are prepared from which of the natural resources?
A– Coke
B– Coal tar
C– Petroleum
D– All of these
Solution
Hint: We know that coke, and coal tar are the by-products obtained in the destructive distillation, and production of coke respectively. Coke is used for production of iron, whereas coal tar is used for the production of insecticides etc. On the basis of the uses of the given options, the natural resources used can be identified.
Complete step by step solution:
Now, we talk about the structure of naphthalene, then it can be represented as:
Now, we will discuss the options one by one.
The first we have is coke. As mentioned coke is produced as the by-product from the destructive-distillation of a coal.
We can say that the coke contains high carbon content, so it is also considered to be the purest form of carbon.
If we talk about the use of coke, then it is used as a fuel. It causes less smoke, that’s why it is more preferable over the use of coal.
The second we have is coal tar. As mentioned, it is the by-product in the production of coke.
If we talk about the use of coal-tar. It is used for the manufacturing of products like perfumes, synthetic dyes as it has an unpleasant smell.
As mentioned, it is used for the production of insecticides, and pesticides.
We know that naphthalene balls are used as a preservative for the protection of clothes from the various insecticides.
The third we have is petroleum; it is a natural rock mineral, and exists in the liquid state.
In the last, we can conclude that the naphthalene balls are prepared from the coal tar.
Hence, the correct option is (B).
Note: Don’t get confused while selecting the natural resources. Just look at the uses of the given options as discussed above, or the properties of the sources. Here, we didn’t consider petroleum because it is used in the production of solvents, fertilizers, and plastics as a raw material.