Chemistry of Metals and Alloys

Ag is the chemical symbol for silver, derived from the Latin word 'argentum'. Gold is Au, Mercury is Hg, and Silicon is Si.

Copper's chemical symbol is Cu, derived from the Latin word 'cuprum'. This symbol is used universally in chemical formulas, equations, and periodic tables to represent copper.

This option is correct. Mum, the first commercial deodorant does contain the zinc compound. It is active ingredient human perspiration, which is largely odourless, until it is fermented by bacteria.

Stainless steel is an iron-based alloy that contains chromium as its essential element, with nickel and manganese as common additional components. Chromium (minimum 10.5%) provides corrosion resistance by forming a protective oxide layer on the surface. Nickel enhances corrosion resistance and mechanical properties, while manganese improves hot working properties and contributes to the alloy's strength and toughness.

Hydrogen sulphide (H2S) reacts with copper in brass to form black copper sulphide, causing discoloration. Oxygen and nitrogen don't react noticeably with brass under normal conditions. Carbon dioxide doesn't significantly tarnish brass compared to H2S's strong reaction with copper.

Mercury is the only metal that is liquid at room temperature (standard conditions). Hydrogen and chlorine are non-metal gases, and water is a liquid compound but not a metal. This is a fundamental property of mercury.

Correct Answer: Iron The most extensively used metal in Indus Valley Civilization was pure copper (unalloyed copper).The metal which made earliest appearance during the Indus Valley Civilization was Silver. The Harappans obtained raw material from outside. The various minerals (metals) used by Indus Valley Civilization people and their sources are as follows: Silver from Afghanistan, Iran and Iraq Lead from Kashmir, Rajasthan, etc. Gold from Karnataka Copper from Rajasthan Lapis Lazuli from Afghanistan Iron was not known to Indus Valley Civilization people.

Correct option: Tetrathiomolybdate is used as an anti copper agent in Wilson’s disease.

Gold is diamagnetic, meaning it creates a weak magnetic field in opposition to an external magnetic field, causing very slight repulsion. Iron, cobalt, and nickel are ferromagnetic materials strongly attracted to magnets. Most metals exhibit either ferromagnetism (attraction) or paramagnetism (weak attraction), while only a few like gold and bismuth show diamagnetic repulsion.

Soft iron is used to make magnetic keepers.

"Metal" is a common noun, so 'a' will be used here.

The Shaurya Chakra is India's peacetime gallantry award made of bronze. It is the third-highest peacetime gallantry award after Ashoka Chakra (made of gold) and Kirti Chakra (made of silver). The bronze composition distinguishes it from higher awards.

Solder is an alloy, typically of tin and lead (or lead-free alternatives like tin-silver-copper), with a lower melting point than the metals being joined. This property allows it to flow into joints when heated, creating conductive and mechanical connections in electronics and plumbing.

Aluminium is used in microprocessors for interconnects due to its excellent balance of conductivity, reliability, and cost-effectiveness. While copper has better conductivity, aluminium's lower tendency to electromigration and established deposition processes made it the industry standard for decades until copper's adoption in the 1990s.