Q1: Cadmium in zinc leach liquor is removed by cementation using

ANS:A - zinc

Zinc is a chemical element with the symbol "Zn" and atomic number 30. It is a bluish-white metal that is relatively soft, malleable, and ductile. Here are some key points about zinc:

1. Physical Properties: Zinc has a melting point of 419.5°C (787.1°F) and a boiling point of 907°C (1,665°F). It has a density of approximately 7.14 grams per cubic centimeter, making it relatively dense.
2. Chemical Properties: Zinc is a moderately reactive metal. It readily reacts with oxygen in the air to form zinc oxide (ZnO), which creates a protective layer on the surface of the metal, preventing further corrosion. It reacts with acids to produce zinc salts and hydrogen gas.
3. Uses: Zinc has numerous industrial applications. It is commonly used as a protective coating for steel and iron products through a process called galvanization, which helps prevent corrosion. Zinc is also used in the production of brass, bronze, and other alloys. Additionally, zinc compounds find applications in various sectors, including agriculture (as a nutrient supplement), rubber manufacturing, and pharmaceuticals.
4. Biological Importance: Zinc is an essential trace element for living organisms. It plays crucial roles in enzyme function, immune system function, wound healing, and DNA synthesis. Zinc deficiency can lead to various health issues.
5. Extraction: Zinc is primarily obtained from its ore, zinc sulfide (ZnS), through a process called roasting, followed by the electrolytic or pyrometallurgical extraction of zinc from zinc oxide (ZnO).

In the context of the question, zinc is used for the cementation process to remove cadmium from zinc leach liquor. This is achieved by exploiting the reactivity of zinc, which allows it to displace cadmium from the solution, facilitating the purification of the zinc leach liquor.