What should be added to the plastics , to change from hard to soft and readily workable into new object .

Options

A. Catalysts
B. Telomers
C. Plasticisers
D. Vulcaniser

Answer

To solve the question, "What should be added to the plastics to change from hard to soft and readily workable into new objects?", we can follow these steps:

### Step 1: Understand the types of additives
We need to consider the four options provided: catalysts, telomers, plasticizers, and vulcanizers. Each of these has a different function in relation to plastics.

### Step 2: Analyze each option
- **Catalysts**: These are substances that increase the rate of a chemical reaction without being consumed in the process. They do not change the physical properties of plastics from hard to soft.

- **Telomers**: These are repetitive nucleotide sequences at the ends of chromosomes. They are not relevant to the modification of plastic properties.

- **Plasticizers**: These are substances added to plastics to make them softer, more flexible, and easier to work with. They are specifically designed to reduce the hardness of rigid plastics, making them more workable.

- **Vulcanizers**: These are used in the process of vulcanization, primarily for rubber, to enhance its strength and durability. They do not convert hard plastics into soft ones.

### Step 3: Identify the correct answer
From the analysis, the only additive that effectively changes hard plastics into soft and workable materials is **plasticizers**. Therefore, the correct answer is plasticizers.

### Final Answer
**Plasticizers** should be added to the plastics to change them from hard to soft and readily workable into new objects.

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