Chemistry of Metals and Alloys

Its constituents are iron and carbon.

It is a non-metal.

This is the correct option. Wood is the material which is non-lustrous in nature. 

Tungsten is used for electric bulb filaments because it has an extremely high melting point (3422°C) and low vapor pressure at high temperatures. This allows it to withstand the intense heat of incandescence without rapidly evaporating or breaking.

Rubidium is a metallic solid.

Lead is used for containers storing strong acids because it forms a protective oxide layer that resists further reaction with most acids. Copper reacts with oxidizing acids, tin can react with strong acids, and brass (copper-zinc alloy) is also reactive.

This is the correct option. Platinum cannot be produced by passing electric current through its compounds in molten state because it is the least reactive metal.

Mercury is the metal, which exists in liquid state at room temperature.

Mixture is impure and a compound is in pure state.

Boron is a nonmetal, belongs to 3rd group and has a symbol - B. The other elements of this group are aluminium, gallium,  indium, thallium.

Ferrum means iron, and iron is used in making steel (Steel is alloy of iron and carbon).

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.

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.

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.

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.