Arrange the following steps in a sequence for the manufacture of glass.
(1) addition of cullet
(2) mixing of raw materials in a proper proportion
(3) addition of colouring pigments
(4) annealing

Options

A. 2134
B. 2341
C. 3214
D. 2431

Explanation

To arrange the steps in the sequence for the manufacture of glass, we follow these steps:

1. **Mixing of raw materials in a proper proportion**: The first step in the glass manufacturing process is to gather all the necessary raw materials, such as silica sand, soda ash, and limestone, and mix them in the correct proportions. This is crucial because the quality and properties of the final glass product depend on the right mixture of these materials.

2. **Addition of cullet**: After mixing the raw materials, the next step is to add cullet. Cullet refers to crushed glass pieces that are recycled and ready to be melted. Adding cullet helps in reducing the energy required for melting the raw materials and improves the quality of the glass.

3. **Addition of colouring pigments**: Once the cullet is added, the next step is to incorporate any desired coloring pigments. These pigments are added to give the glass its specific color and aesthetic appeal.

4. **Annealing**: The final step in the glass manufacturing process is annealing. This involves heating the glass to a specific temperature and then gradually cooling it down. Annealing is essential as it helps to relieve internal stresses within the glass and ensures that it has the desired physical properties and shape.

So, the correct sequence of steps for the manufacture of glass is: **2, 1, 3, 4**.