Question

The shape of lactose crystal is

• A. Bandshaw
• B. Tomahawk
• C. Brooch
• D. Mallet

Hint:

$\alpha$-lactose monohydrate exhibits tomahawk crystal geometry, while $\beta$-anhydrous lactose forms needle or prismatic crystals.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Lactose in dairy products crystallizes predominantly in the $\alpha$-lactose monohydrate form when concentration exceeds saturation solubility.

Step 2: Detailed Explanation:
During slow or uncontrolled cooling of sweetened condensed milk or ice cream, $\alpha$-lactose monohydrate crystals grow into a distinct wedge-like or tomahawk prism morphology.
If crystals exceed $10\,\mu\text{m}$ in length, they impart an objectionable gritty or sandy texture known as sandiness defect.

Step 3: Final Answer:
Hence, the shape of lactose crystals is tomahawk.