Answer: (3) Applying a coating of zinc The formation of rust, that is a mixture of iron oxides, on the surface of iron objects or structures. The... View Article
Answer: (d) AgNO3 solution and copper metal A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in... View Article
Answer: Reduction method is used to obtain metal from its oxide. Metallic oxide is reduced to metal during the extraction of metals. Metallurgy... View Article
Answer: Mineral is a naturally occurring inorganic solid with a definite chemical composition and a crystalline structure. Mineral elements... View Article
Answer: Electron dot structures or Lewis dot formula can be drawn if the molecular formula of the compound is known. It defines the nature of... View Article
Answer: When zinc is introduced to an iron sulphate solution, the colour of the iron sulphate solution changes. Since zinc is more reactive than... View Article
Answer: The reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their... View Article
Answer: Metals are minerals or substances that form naturally below the surface of the Earth. Most metals are lustrous or shiny. Metals are... View Article
Answer: Plaster of Paris is a popular substance that is utilized most commonly for sculpting materials and in gauze bandages. Plaster of Paris... View Article
Answer: The pH value of milk is 6 since it is acidic in nature. When the milk is converted into curd due to the action of bacteria lactic acid... View Article
Answer: Acetic acid is a weak acid, while HCl is a strong acid. The formation of hydrogen gas as a result of the acid's reaction with the... View Article
Answer: pH is defined as the negative logarithm of H+ ion concentration. Hence, the meaning of the name pH is justified as the power of... View Article
Answer: Acids are substances that produce hydrogen ions as they dissociate with water. As some compounds dissociate in aqueous solution,... View Article
Answer: The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of... View Article
Answer: (c) Antacid Because of the presence of HCl, the pH of our digestive system is acidic. Antacids are bases that give relief from pain and... View Article
Answer: (b) HCl The eggshell contains calcium carbonate, which on reaction with HCl liberates CO2Â gas which turn lime water to milky. CaCO3 +... View Article
Answer: Sodium Hydrogen Carbonate also known as Sodium Bicarbonate or Baking Soda. It is a crystalline solid white which has no odour. In its... View Article