Cement types — identification of white cement Portland cement manufactured from pure white chalk and clay and essentially free from iron oxide pigments is commonly called:

Introduction / Context:
Different cements are formulated to achieve specific color or performance objectives. When architectural aesthetics call for light or colored finishes, a special low-iron formulation is used to produce a white product.

Given Data / Assumptions:

• Raw materials: very low iron and manganese content to avoid gray coloration.
• Manufacturing controls to prevent contamination from kiln and grinding media.
• Application focus: decorative concrete, terrazzo, tiles, and colored mortars.

Concept / Approach:
The absence of coloring oxides (primarily Fe2O3) yields a white clinker which, when ground with gypsum, becomes white cement. Performance is comparable to ordinary Portland cement, but color control is paramount; white pigments can be added without muddying.

Step-by-Step Solution:

Verification / Alternative check:
Colorimetric tests (whiteness index) and chemical analysis confirm low iron content; compressive strength tests verify structural suitability.

Why Other Options Are Wrong:

• Quick-setting and rapid-hardening cements (A/B): defined by setting/strength characteristics, not color.
• Low-heat cement (D): formulated for mass concrete to limit temperature rise; again not color-driven.
• PPC (E): blended with pozzolana, typically gray.

Common Pitfalls:
Assuming white cement is always weaker or only decorative; it can meet structural grades but is more expensive due to stringent raw materials and processing.

Final Answer: