Aluminium oxide: Al³⁺ and O²⁻. To balance charges, 2 Al³⁺ (total +6) combine with 3 O²⁻ (total -6). Thus valency of Al is 3. It loses three electrons. Formula determined by criss-cross method.
Explanation:
Teflon (Polytetrafluoroethylene or PTFE) is used as a non-stick coating for cookware because of its extreme chemical inertness, high heat resistance, and low friction coefficient. Polythene and PVC melt at lower temperatures, and Bakelite is a thermosetting plastic used for electrical switches.
Explanation:
Methyl orange is red at pH < 3.1 and yellow at pH > 4.4. Litmus: red in acid, blue in base. Phenolphthalein: colorless in acid, pink in base. Turmeric: yellow in acid, reddish-brown in base.
Explanation:
Faraday's First Law of Electrolysis states that the mass of a substance deposited or liberated at an electrode is directly proportional to the total charge (Q) passed through the electrolyte (m = ZQ, where Z is the electrochemical equivalent). The Second Law relates mass to equivalent weight.
No comments yet. Be the first to start the discussion!