Which one of the following metals has both malleability and ductility properties ?

1. General Physical Properties of Metals (basic)

Metals are defined by a specific set of physical characteristics that distinguish them from non-metals. At a basic level, metals are generally hard solids with a characteristic shine known as metallic luster. While most metals are tough and durable, there are fascinating exceptions; for instance, Sodium (Na) and Potassium (K) are alkali metals so soft they can be sliced with a simple kitchen knife Science, Class X (NCERT 2025 ed.), Chapter 3, p.40.

Two critical properties you must master for any competitive exam are malleability and ductility. These define how a metal responds to mechanical stress. Gold (Au) is the most remarkable example, being both the most malleable and the most ductile metal known Science, Class X (NCERT 2025 ed.), Chapter 3, p.39.

Property	Definition	Common Example
Malleability	The ability to be beaten or hammered into thin sheets.	Aluminium foil used for food packaging.
Ductility	The ability to be drawn or stretched into thin wires.	Copper wires used in household electrical circuits.

Additionally, metals are sonorous, meaning they produce a deep, ringing sound when struck. This is why metals are used to make bells and strings for musical instruments like the sitar or violin Science-Class VII, NCERT (Revised ed 2025), Chapter 4, p.46. They are also excellent conductors of heat and electricity, which is why your cooking pans have metal bases but often plastic or wooden handles to protect your hands.

Sources: Science, Class X (NCERT 2025 ed.), Chapter 3: Metals and Non-metals, p.37, 39, 40; Science-Class VII, NCERT (Revised ed 2025), Chapter 4: The World of Metals and Non-metals, p.46

2. Exceptions to the Rules of Metal States (basic)

In chemistry, we often define metals by a set of standard physical properties: they are usually hard, lustrous (shiny), and exist as solids at room temperature. However, for a UPSC aspirant, the true mastery lies in the exceptions to these rules. Nature rarely follows a perfect script, and these deviations are frequently tested because they challenge our general assumptions about elements. For instance, while we think of metals as heavy and indestructible, the alkali metals—specifically Lithium (Li), Sodium (Na), and Potassium (K)—are so soft that they can be easily cut with a simple kitchen knife Science, Class VII, Chapter 4, p.43. They also possess surprisingly low densities, unlike the dense metals like Iron or Gold we encounter in daily life.

The most striking exception involves the physical state of metals. Almost all 118 known elements that are categorized as metals exist in a rigid, solid form. The lone standout at standard room temperature is Mercury (Hg), which remains a liquid—a property that historically made it indispensable for use in clinical thermometers Science, Class VIII, Chapter 8, p.123. Beyond Mercury, there are "borderline" cases like Gallium (Ga) and Caesium (Cs). While technically solids at room temperature (approx. 25°C), their melting points are so low (around 30°C) that they will literally turn into a silvery liquid if you simply hold them in the palm of your hand Science, Class X, Chapter 3, p.40.

Property	General Rule	The Exceptions
Physical State	Solid at Room Temp	Mercury (Hg) is liquid; Gallium & Caesium melt near body temp.
Hardness	Hard and Strong	Lithium, Sodium, Potassium are soft enough to be cut with a knife.
Melting Point	Very High	Alkali metals and Gallium/Caesium have very low melting points.

Lastly, while metals are generally malleable (can be beaten into sheets) and ductile (can be drawn into wires), the degree varies significantly. Gold (Au) and Silver (Ag) are the champions of these properties. In contrast, a liquid metal like Mercury is neither malleable nor ductile in its standard state. Understanding these nuances helps us realize that the Periodic Table is not just a list of elements, but a spectrum of varying behaviors Science, Class X, Chapter 3, p.39.

Sources: Science, Class X (NCERT 2025 ed.), Chapter 3: Metals and Non-metals, p.39-40; Science-Class VII (NCERT 2025 ed.), Chapter 4: The World of Metals and Non-metals, p.43; Science, Class VIII (NCERT 2025 ed.), Chapter 8: Nature of Matter, p.123

3. Chemical Reactivity and the Reactivity Series (intermediate)

At its heart, chemical reactivity is a metal's 'hunger' to lose electrons and achieve a stable electronic configuration. Not all metals share the same level of enthusiasm for this process. While Potassium (K) and Sodium (Na) react so violently with cold water that the evolved Hydrogen gas immediately catches fire, others like Calcium (Ca) react more calmly, and some, like Gold (Au), refuse to react with water or oxygen altogether Science, class X (NCERT 2025 ed.), Chapter 3, p. 43. This spectrum of behavior is what we call the Reactivity Series (or Activity Series). To organize these elements scientifically, we use displacement reactions. Imagine a 'tug-of-war' for a chemical bond: a more reactive metal will always displace a less reactive metal from its salt solution. For example, if Iron (Fe) is placed in a Copper (II) sulphate solution, it will push the copper out because iron is higher in the series Science, class X (NCERT 2025 ed.), Chapter 3, p. 46. By performing these tests, scientists have ranked metals from the most reactive (at the top) to the least reactive (at the bottom).

Category	Metals	Behavior in Nature
Highly Reactive	K, Na, Ca, Mg, Al	Never found in free state; found as compounds.
Moderately Reactive	Zn, Fe, Pb, [H], Cu	Found as oxides, sulphides, or carbonates.
Least Reactive	Ag, Au	Often found in the 'free state' (native form).

Understanding this hierarchy is vital for metallurgy. Metals at the bottom of the series, like Gold and Silver, are found in their pure form because they are chemically 'noble'—they do not easily bond with other elements. Conversely, metals at the top are so reactive that they must be extracted through intensive processes like electrolysis Science, class X (NCERT 2025 ed.), Chapter 3, p. 49.

Sources: Science, class X (NCERT 2025 ed.), Metals and Non-metals, p.43; Science, class X (NCERT 2025 ed.), Metals and Non-metals, p.45; Science, class X (NCERT 2025 ed.), Metals and Non-metals, p.46; Science, class X (NCERT 2025 ed.), Metals and Non-metals, p.49

4. Occurrence of Metals: Ores and Native States (intermediate)

To understand where metals come from, we must look at the Earth's crust, which acts as a massive reservoir for these elements. Metals exist in nature in two primary forms: the Native State (free state) and the Combined State. The deciding factor behind which state a metal adopts is its position in the reactivity series. Metals at the bottom of this series, such as Gold (Au), Silver (Ag), and Platinum (Pt), are chemically 'noble' or unreactive. Because they do not easily react with moisture or oxygen, they are often found in their pure, metallic form in nature Science, Class X (NCERT 2025 ed.), Chapter 3: Metals and Non-metals, p. 50. Interestingly, some metals like Copper (Cu) and Silver (Ag) are versatile; they can be found both in their free state and as compounds like sulphides or oxides.

In contrast, metals at the top of the reactivity series—such as Potassium (K), Sodium (Na), and Calcium (Ca)—are so reactive that they are never found as free elements. They are always bonded with other elements. Those in the middle of the series, like Iron (Fe) and Zinc (Zn), are typically found as oxides, sulphides, or carbonates Science, Class X (NCERT 2025 ed.), Chapter 3: Metals and Non-metals, p. 50. Oxygen is the most common partner because it is highly reactive and abundant in the Earth's crust. This leads to the definition of an Ore: a mineral from which a metal can be extracted profitably and conveniently. As geographers note, for a mineral accumulation to be called an 'ore', the metal concentration must be high enough to make mining commercially viable Contemporary India II: Geography Class X, p. 106.

Finally, we classify these metallic minerals based on their composition. Ferrous minerals contain iron (like iron ore or manganese), while Non-ferrous minerals do not (like copper or bauxite) India People and Economy, Geography Class XII, Chapter 5, p. 54. Understanding these formations is crucial because the type of rock structure (cracks in igneous rocks or layers in sedimentary rocks) determines how difficult and expensive it will be to extract the metal.

Reactivity Level	Metals	Common Occurrence State
High Reactivity	K, Na, Ca, Mg, Al	Always combined (Chlorides, Oxides)
Medium Reactivity	Zn, Fe, Pb	Oxides, Sulphides, Carbonates
Low Reactivity	Cu, Ag, Au, Pt	Native state (Free state)

Sources: Science, Class X (NCERT 2025 ed.), Chapter 3: Metals and Non-metals, p.50; Contemporary India II: Geography Class X (NCERT), Minerals and Energy Resources, p.106; India People and Economy, Geography Class XII (NCERT 2025 ed.), Chapter 5: Mineral and Energy Resources, p.54

5. Alloys and Property Modification (intermediate)

In their pure state, many metals possess limitations that make them unsuitable for specific industrial or domestic uses. For instance, pure gold (24 carat) is incredibly soft, making it impractical for durable jewelry; it must be mixed with silver or copper to increase its hardness Science, Class X, Metals and Non-metals, p.54. An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, designed to 'engineer' specific desirable properties. This process of alloying allows us to enhance strength, resist corrosion, or alter electrical and thermal characteristics Science, Class VIII, Nature of Matter, p.118. One of the most significant changes during alloying is the reduction of melting point and electrical conductivity. For example, while pure copper is an excellent conductor used in electrical circuits, its alloys like Brass (Copper + Zinc) and Bronze (Copper + Tin) are significantly poorer conductors Science, Class X, Metals and Non-metals, p.54. Similarly, Solder, an alloy of lead (Pb) and tin (Sn), is specifically designed to have a very low melting point so it can be easily melted to join electrical wires Science, Class X, Metals and Non-metals, p.54. If one of the constituent metals in an alloy is mercury (Hg), the resulting mixture is referred to as an amalgam.

Alloy	Composition	Key Modification/Use
Stainless Steel	Fe, Ni, Cr, and a little C	Resists rusting; highly durable Science, Class VIII, p.118
22 Carat Gold	22 parts Au, 2 parts Ag or Cu	Increased hardness for jewelry Science, Class X, p.54
Sterling Silver	Silver and Copper	Hardened for coins and silverware Environment and Ecology, Majid Hussain, p.34
Solder	Pb and Sn	Low melting point for welding wires Science, Class X, p.54

Sources: Science, Class VIII (NCERT 2025), Nature of Matter: Elements, Compounds, and Mixtures, p.118; Science, Class X (NCERT 2025), Metals and Non-metals, p.54; Environment and Ecology, Majid Hussain (3rd ed.), Distribution of World Natural Resources, p.34

6. Defining Malleability and Ductility (exam-level)

In our journey through the periodic table, we encounter metals as the dominant group, defined largely by how they respond to physical force. For the UPSC, it is essential to distinguish between two closely related but distinct mechanical properties: malleability and ductility. These properties arise from the unique way metal atoms are bonded together, allowing layers of atoms to slide over one another without the bond actually breaking.

Malleability is the ability of a material to be beaten, pressed, or hammered into thin sheets without cracking or breaking Science, Class X (NCERT 2025 ed.), Chapter 3, p. 38. You see this property in action every day when you use aluminum foil to wrap food or notice the silver foil (vark) used to decorate traditional Indian sweets Science-Class VII, NCERT (Revised ed 2025), Chapter 4, p. 43. On the other hand, ductility is the ability of a material to be stretched or drawn into thin wires Science, Class X (NCERT 2025 ed.), Chapter 3, p. 38. This is why copper and aluminum are so vital for electrical wiring and why stringed instruments like the sitar or guitar use metal strings Science-Class VII, NCERT (Revised ed 2025), Chapter 4, p. 44.

While these traits are characteristic of metals, they exist on a spectrum. Gold (Au) and Silver (Ag) are the most malleable and ductile of all metals. To give you a sense of the scale, a single gram of gold can be drawn into a wire nearly 2 kilometers long! Science, Class X (NCERT 2025 ed.), Chapter 3, p. 38. However, there are notable exceptions to these "general" rules. Mercury (Hg), being a liquid at room temperature, is neither malleable nor ductile, and alkali metals like Sodium (Na) are so soft they can be cut with a knife rather than being beaten into sheets. Non-metals, by contrast, are typically brittle and will shatter if struck with a hammer Science, Class X (NCERT 2025 ed.), Chapter 3, p. 55.

Property	Definition	End Result	Champion Metal
Malleability	Ability to withstand hammering/pressure	Thin Sheets / Foils	Gold & Silver
Ductility	Ability to be drawn/stretched	Thin Wires	Gold

Sources: Science, Class X (NCERT 2025 ed.), Chapter 3: Metals and Non-metals, p.38, 55; Science-Class VII, NCERT (Revised ed 2025), Chapter 4: The World of Metals and Non-metals, p.43, 44

7. Solving the Original PYQ (exam-level)

Now that you have mastered the foundational physical properties of elements, this question serves as a perfect application of the general vs. exceptional characteristics of metals. In your conceptual learning path, you explored malleability (the ability to be hammered into thin sheets) and ductility (the ability to be drawn into thin wires). This PYQ tests your ability to move beyond simple definitions and identify which specific elements represent the pinnacle of these properties, a common theme in Science, class X (NCERT 2025 ed.).

To arrive at the correct answer, (B) Au (Gold), you must apply a process of elimination based on the physical state and atomic structure of the options. While most metals are solid and hard, Gold is scientifically recognized as the most malleable and ductile metal known to man. In a clinical exam setting, you should recall that a very small amount of gold can be stretched into an incredibly long wire, making it the quintessential example of these properties as per Science-Class VII . NCERT(Revised ed 2025).

The UPSC often includes "trap" options that represent exceptions to the rules you just learned. Mercury (Hg) is the most famous exception; because it is a liquid at room temperature, it cannot be hammered or drawn into wires. Similarly, Sodium (Na) is an alkali metal that is so soft it can be cut with a knife, lacking the structural integrity for high ductility. While Cerium (Ce) is indeed a metal, it does not exhibit these specific mechanical strengths to the legendary degree that Gold does. Identifying these exceptions is key to navigating the Materials section of the Prelims syllabus.