Consider the following statements about bakelite
I. It is a phenol-formaldehyde resin.
II. It is a linear product.
III. Soft bakelite is used for making glue for binding laminated wooden planks and also in varnishes
IV. Hard bakelite useful for in making combs, fountain pen, phonographs records, barrels, etc.
Which of the above fact(s) is/are true about bakelite? Choose the correct option.

Options

A. I, II and III
B. II, III and IV
C. I, III and IV
D. All of these

Answer

To solve the question regarding the statements about Bakelite, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I**: "It is a phenol-formaldehyde resin."
- Bakelite is indeed a type of synthetic polymer known as a phenol-formaldehyde resin. This statement is **true**.

### Step 2: Analyze Statement II
**Statement II**: "It is a linear product."
- Bakelite is a thermosetting polymer, which means that once it is set, it cannot be remolded. It has a three-dimensional cross-linked structure rather than a linear structure. Therefore, this statement is **false**.

### Step 3: Analyze Statement III
**Statement III**: "Soft bakelite is used for making glue for binding laminated wooden planks and also in varnishes."
- Soft Bakelite, also known as a phenolic resin, is indeed used in adhesives and varnishes. This statement is **true**.

### Step 4: Analyze Statement IV
**Statement IV**: "Hard bakelite is useful for making combs, fountain pens, phonograph records, barrels, etc."
- Hard Bakelite is known for its durability and is commonly used in the manufacture of various items such as combs, fountain pens, and phonograph records. This statement is **true**.

### Conclusion
Based on the analysis:
- Statement I: True
- Statement II: False
- Statement III: True
- Statement IV: True

Thus, the true statements about Bakelite are I, III, and IV.

### Final Answer
The correct option includes statements I, III, and IV as true.

---