Properties and Classification of Metals and Non-Metals

Ductility is the physical property of a material that allows it to be drawn out into thin wires without breaking. Metals like copper, aluminum, and gold are highly ductile, which is why they're used for electrical wiring. Malleability refers to being hammered into thin sheets, opacity means not allowing light to pass through, and sonorous means producing sound when struck. These are different physical properties.

Malleability is defined as the ability of a material to be hammered or rolled into thin sheets without breaking. This is a characteristic property of metals - gold can be hammered into extremely thin gold leaf, and aluminum can be rolled into foil. Option B describes ductility (drawing into wires), option C describes sonorosity (producing sound), and option D is incorrect because these are distinct properties, not all the same property.

Metals typically share several characteristic properties: they are lustrous (shiny), malleable (can be hammered into sheets), ductile (can be drawn into wires), good conductors of heat and electricity, and mostly opaque. Brittleness is NOT a property of metals - brittle materials break or shatter when stressed instead of deforming. Brittleness is actually a characteristic of non-metals like sulfur or phosphorus. Therefore brittle is the property that does not belong with metals.

Mercury is the only metal that exists as a liquid at standard room temperature (20-25°C). This is due to its weak metallic bonding and relatively low melting point of -38.83°C. All other metals listed (iron, gold, aluminum) are solids at room temperature. Mercury's unique liquid state makes it useful in thermometers, barometers, and electrical switches, despite its toxicity.

Sonorosity is the property of producing a ringing sound when struck - this is a characteristic property of metals, which is why bells are made of metal. Non-metals are typically non-sonorous - they don't produce ringing sounds. The question asks which is NOT a property of non-metals, so sonorous is the correct answer because it's a metal property, not a non-metal property. Non-lustrous (dull appearance), transparent (allowing light through), and non-ductile (cannot be drawn into wires) are all properties that can describe non-metals.

Non-metals are highly electronegative, meaning they have a strong tendency to attract electrons when forming chemical bonds. This is why non-metals typically gain electrons to form negative ions (anions). Option B is incorrect because non-metals are generally oxidizing agents (accept electrons), not reducing agents (donate electrons). Option C describes metals, not non-metals. Option D is incorrect because non-metals typically form acidic or neutral oxides (like CO2, SO2, NO2), while metals form basic oxides.

Metals react with oxygen to form basic oxides because they are electropositive elements that readily lose electrons. This is a key chemical property distinguishing metals from non-metals, which typically form acidic or neutral oxides. Option A is incorrect because metals tend to lose electrons (not gain). Option B is wrong because metals are reducing agents (not oxidizing agents). Option D is false because metals are electropositive (not electronegative).

Mercury is the only metal listed among these elements. It is a transition metal that is unique in being liquid at room temperature, which is why it is used in thermometers. Nitrogen and Chlorine are gaseous non-metals, while Sulphur is a solid non-metal.

Phosphorus (specifically red or white phosphorus) is used in matchbox industries, particularly on the striking surface of safety matches. When the match head is rubbed against this surface, the friction generates enough heat to ignite the phosphorus, which then ignites the match head. Sulphur is sometimes present in the match head itself, but the key material on the striking surface is phosphorus.

This question appears to be asking about which metal can be easily CUT or broken (low hardness). Zinc is relatively soft compared to iron and aluminium, and can be more easily deformed or cut. However, the wording 'broken down' is ambiguous. Mercury cannot be 'broken' as it is liquid. Iron and aluminium are harder structural metals. Among solid metals listed, zinc has the lowest hardness.

Graphite, an allotrope of carbon, is an excellent conductor of electricity due to its delocalized electrons in the layered structure. This makes it unique among non-metals. Bromine, Iodine, and Oxygen are typical non-metals that are insulators (poor conductors). Graphite's conductivity explains its use in electrodes and motor brushes.

Oxygen is the most abundant element in Earth's crust, comprising approximately 46-47% by mass. It is found in silicate minerals, oxides, water, and atmospheric oxygen. Silicon is the second most abundant (28%), followed by aluminium (8%), then iron (~5%). Sulphur, Potassium, and Magnesium are present in much smaller quantities.

Diamond is the hardest known natural material, rating 10 on the Mohs hardness scale. Its extreme hardness comes from the three-dimensional network of strong covalent bonds between carbon atoms. Graphite (another carbon allotrope) is soft, while Bromine and Iodine are soft non-metals. Diamond's hardness makes it valuable for cutting tools and industrial abrasives.

Sodium is a very soft metal that can be easily cut with a knife. It is an alkali metal with low hardness due to its large atomic radius and weak metallic bonding (single valence electron). Aluminium, Iron, and Copper are much harder metals used in structural applications. Sodium's softness is characteristic of Group 1 metals.

Zinc is the odd one out because it is the only metal in the list. Nitrogen, Bromine, and Iodine are all non-metals (Nitrogen is a gas, Bromine and Iodine are halogens). Zinc is a transition metal with typical metallic properties: luster, conductivity, and malleability.

Carbon is the only non-metal in this list. It exists as graphite, diamond, or amorphous carbon and lacks metallic properties like luster, electrical conductivity (except graphite), and malleability. Potassium, Sodium, and Mercury are all metals with characteristic metallic properties: conductivity, malleability, and tendency to lose electrons.

Silver is a metal with all the listed properties: bright metallic luster (reflectivity), hardness (though relatively soft among metals), and excellent electrical conductivity (highest among all elements). Carbon (graphite form conducts but has no luster), Oxygen and Sulphur are non-metals lacking these metallic characteristics. Silver's combination of these properties makes it valuable in jewelry, electronics, and mirrors.

Bromine is the only non-metal that exists as a liquid at room temperature (25°C). Graphite is a solid form of carbon, iodine sublimates directly from solid to gas, and sulphur is a solid yellow powder.