Match the following :
a. Red-Yellow : i. Primary colour
b. Green-Voilet : ii. Secondary colour
c. Blue-Orange : iii. Complementary colour
d. Black-White : iv. Achromatic colour

Question

Accepted Answer

Option 2 is the correct answer for the given question. Let's provide a detailed explanation for why this is the case and why the other options are incorrect.

### Explanation for Option 2:

1. **a. Red-Yellow : ii. Secondary colour**
   - Red and Yellow are primary colors, but when mixed, they create Orange, which is a secondary color. Therefore, Red-Yellow is associated with secondary colors.

2. **b. Green-Violet : i. Primary colour**
   - Green and Violet are not primary colors. However, the question seems to imply a relationship with primary colors. Green is made from Blue and Yellow, and Violet is made from Blue and Red. This suggests a connection to primary colors, but the question's context might be focusing on the primary components involved in creating these colors.

3. **c. Blue-Orange : iii. Complementary colour**
   - Blue and Orange are complementary colors. Complementary colors are pairs of colors that, when combined, cancel each other out. This means they produce a grayscale color like white or black. They are located opposite each other on the color wheel.

4. **d. Black-White : iv. Achromatic colour**
   - Black and White are considered achromatic colors. Achromatic colors are colors without hue, meaning they do not appear on the color wheel. They include black, white, and all the grays in between.

### Why Other Options are Incorrect:

1. **Option 1: a-ii, b-i, c-iii, d-iv**
   - This option is incorrect because it suggests that Green-Violet is a primary color, which is not accurate. Green and Violet are not primary colors.

3. **Option 3: a-iii, b-iv, c-ii, d-i**
   - This option is incorrect because it suggests that Red-Yellow is a complementary color, which is not true. Red and Yellow are primary colors that combine to form a secondary color, Orange.

4. **Option 4: a-ii, b-iv, c-iii, d-i**
   - This option is incorrect because it suggests that Green-Violet is an achromatic color, which is not accurate. Green and Violet are chromatic colors with distinct hues.

In conclusion, Option 2 correctly matches each pair with its respective category based on the principles of color theory.