Metals And Non Metals Exam: Quiz!

Explanation
Potassium is the most reactive metal among the options given. This is because it belongs to the alkali metal group, which is known for its high reactivity. Potassium readily reacts with water and oxygen in the air, forming potassium hydroxide and potassium oxide respectively. It also reacts vigorously with other elements and compounds, making it highly reactive compared to iron, zinc, and gold.

Explanation
Mercury is the correct answer because it is the only metal that remains in liquid form at room temperature. Gold, sodium, and bromine are all solid at room temperature. Mercury's low melting point allows it to exist as a liquid, making it unique among metals.

Explanation
Non-metals are generally solids and gases because they have low melting and boiling points compared to metals. This means that at room temperature, many non-metals exist in a solid state, such as carbon and sulfur. However, some non-metals, like oxygen and nitrogen, exist as gases at room temperature. Therefore, non-metals can exist in both solid and gaseous states, making the answer "generally solids and gases" correct.

Explanation
Sodium is stored in kerosene because it reacts violently with air and water. Kerosene is a non-reactive liquid that helps to prevent the sodium from coming into contact with air or moisture, which could cause it to ignite or explode. Storing sodium in kerosene ensures its safety and stability.

Explanation
Bromine is the correct answer because it is the only non-metal that is a liquid at room temperature. Carbon, iodine, and chlorine are all non-metals, but they exist as solids or gases at room temperature. Bromine, on the other hand, is a reddish-brown liquid that easily evaporates into a gas. It has a low boiling point of 58.8 degrees Celsius, allowing it to remain in a liquid state at room temperature.

Explanation
Metal oxides are of nature basic because they react with acids to form salts and water. They have a tendency to donate electrons and accept protons, making them basic in nature. This is due to the presence of metal cations in the oxide, which have a strong affinity for accepting protons. Therefore, metal oxides can be classified as basic compounds.

Explanation
Sodium and potassium are highly reactive metals that can react with water and air. They are soft enough to be easily cut with a knife. Potassium is even softer than sodium and can be cut with a butter knife. Therefore, the statement "The metal can be cut with a knife" is true for sodium and potassium.

Explanation
Iron is a good conductor of electricity because it has free electrons that are able to move easily through the material. This allows electric current to flow smoothly without much resistance. In contrast, materials like glass, wood, and plastic do not have free electrons and therefore do not conduct electricity well.

Explanation
Iron is known for its malleability, ductility, and sonorousness. Malleability refers to the ability of a material to be hammered or pressed into different shapes without breaking. Ductility refers to the ability of a material to be stretched into wires without breaking. Sonorousness refers to the ability of a material to produce a ringing sound when struck. However, iron is not known for its brittleness, which is the tendency of a material to break or shatter when subjected to stress.

Explanation
Ductility refers to the ability of a metal to be stretched or deformed without breaking and to be drawn into thin wires. This property is important in various industries, such as electrical wiring and jewelry making, where metals need to be shaped into different forms. Conductivity, on the other hand, refers to the ability of a material to conduct electricity, while malleability refers to the ability to be hammered or rolled into thin sheets. Therefore, ductility is the correct answer for the given question.

Explanation
Silver will not produce hydrogen gas on reacting with dilute sulphuric acid because it is a less reactive metal. Silver is below hydrogen in the reactivity series, so it cannot displace hydrogen from sulphuric acid to form hydrogen gas.

Explanation
Malleability is the property of metals that allows them to be beaten into thin sheets without breaking or shattering. This property is due to the ability of metal atoms to move and rearrange themselves under pressure, allowing the metal to be easily shaped. Conduction refers to the ability of a material to transfer heat or electricity, while ductility refers to the ability of a material to be stretched into a wire. None of these properties are directly related to the ability of metals to be beaten into thin sheets.