In the realm of academic excellence, there are certain individuals who leave an indelible mark on their journey. Ritika Kumari, a young and talented student, has emerged as a true inspiration and role model for aspiring scholars. Hailing from Dhanbad, a district known for its coal and mineral resources, Ritika has not only topped her …
In the realm of academic achievements, there are exceptional individuals who stand out from the crowd, inspiring others with their unwavering dedication and remarkable talents. Meet Ritika Kumari, a brilliant student who has soared to new heights in the district of Dhanbad, leaving an indelible mark in the realm of 12th Science exams. In this …
Ritika Kumari: A Shining Star in District Dhanbad’s 12th Science Exams Read More »
Using red litmus paper, we can determine what is in each test tube. This can be obtained by observing the red litmus paper\’s change in colour. The three test tube solutions are poured one at a time on litmus paper.A basic solution can be found in the substance that changes red litmus into blue.Divide the …
(a) The process of corrosion involves the oxidation of refined metal by atmospheric oxygen to produce a more stable product, such as oxides. Throughout the corrosion process, the metal gradually deteriorates. Iron rusting is a prime example of corrosion since it results in the formation of iron oxide. Annually, millions of dollars are paid to …
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity Read More »
Flushing nitrogen into food packets that include oil and fat-containing substances is mainly done to stop rancidity, which occurs when oil or fat combines with air and produces an undesirable smell and flavour. Therefore, rancidity is avoided by eliminating nitrogen, which creates an environment that is not reactive.
Iron articles are painted to prevent them from rusting. When a metal surface is unpainted, it comes into touch with atmospheric oxygen and develops Iron(III) oxide when there is moisture present. However, if the surface is painted, it is protected from moisture and the elements, preventing rusting.
Copper metal is the shining brown element (Cu). The metal reacts with atmospheric oxygen when heated in air to produce copper oxide. Thus, the substance that is black in colour is copper oxide. 2Cu(s) + O2(g) → 2CuO(s)
(a) The element being oxidised is the one to which oxygen is added in a chemical reaction to form the element\’s corresponding oxide. Example: O2(g) + 4K(s) = 2K2O (s) O2 (g) + H2S = O2 + SO2 (b) A compound is said to be reduced in a chemical reaction when the oxygen is removed …
In a double displacement reaction, the ions are exchanged between the compounds when two solutions containing soluble salts are combined. One of these compounds settles to the bottom of the container when it has solid formed and is insoluble in water. This substance is known to as a precipitate, and the associated reaction is known as …
What do you mean by a precipitation reaction? Explain by giving examples. Read More »
Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
