Which d block element is used in the manufacture of dry cell?
AZinc
BIron
CNickel
DCobalt
Answer:
A. Zinc
Read Explanation:
Zinc (Zn) in Dry Cell Construction
- The d-block element commonly used in the manufacture of a standard dry cell (Leclanche cell) is Zinc.
- Anode Function: In a zinc-carbon dry cell, the outer casing is made of zinc metal, which serves as the negative electrode or the anode.
- Chemical Reaction: During the discharge process, the zinc container undergoes oxidation according to the half-reaction: Zn(s) → Zn²⁺(aq) + 2e⁻.
- Classification: Zinc is a transition metal located in Group 12 of the periodic table, specifically in the d-block, with the atomic number 30.
- Electrolyte Context: While the anode is zinc, the cathode typically consists of a carbon (graphite) rod surrounded by a paste of ammonium chloride (NH₄Cl) and manganese dioxide (MnO₂).
- Importance: Zinc is preferred due to its favorable electrode potential, durability, and cost-effectiveness for portable power sources.