Chemistry
Draw the dot and cross structure of the following:
(a) Hydronium ion
(b) Oxygen molecule
(c) Calcium oxide
[Atomic number: H = 1, O = 8, Ca = 20]
Related Questions
Match the uses of alloys in List 1 with the appropriate answer from List 2.
List 1 List 2 (a) Used in making decorative articles. 1. Stainless steel (b) An alloy used in making aircraft and light tools. 2. Brass (c) Used in making surgical Instruments. 3. Duralumin You are provided with some compounds in the box.
[SO2, PbO, CO, K2SO4, H2SO4, CH3COOH, NaHSO4, KCl]
Choose the compound from the above box that fits the descriptions from (a) to (c).
(a) An acid present in vinegar.
(b) An oxide which dissolves in water forming an acid.
(c) A salt formed by the incomplete neutralization of an acid by a base.
Given below is the diagram for the laboratory preparation of Nitric Acid.
(a) Name the reactant labelled Y.
(b) Write a balanced equation for the reaction between Y and KNO3.
(c) The complete apparatus is made up of glass. Why?
(d) State why concentrated HNO3 appears slightly yellowish in colour when left standing in a glass bottle for a long time.
Answer the following questions related to the electrolytic reduction of pure Alumina by Hall Heroult’s process.
(a) The reaction occurring at the anode.
(b) The reaction occurring at the cathode.