Chemistry of Metals and Alloys

Magnesium wire burns with an intense white light when ignited, making it ideal for flash bulbs in photography. Magnesium has a low ignition point and produces a very bright flash, illuminating the scene briefly.

Zinc is the primary metal used for galvanizing iron because it forms a protective oxide layer that prevents corrosion through sacrificial protection. Mercury, cadmium, and tin are used in other plating processes but not galvanization.

Nichrome is used because it has high electrical resistance and does not oxidize or corrode easily at high temperatures. Tungsten is used in incandescent bulbs, while iron would oxidize rapidly at heating element temperatures.

Diamond is the hardest known natural material on Earth, ranking 10 on the Mohs scale of mineral hardness. Its exceptional hardness comes from its crystal structure where each carbon atom is strongly bonded to four others in a tetrahedral arrangement. Tungsten is very hard but not the hardest substance.

With base: Be(OH)₂ + 2OH^- ---------> [Be(OH)₄]^2- With acid: Be(OH)₂ + 2HCl + 2H₂O -----------> [Be(OH)₄]Cl₂

This option is correct because the molten metal is taken out of the converter and is allowed to cool. This is dissolved in sulphur dioxide slowly given out by molten metal. It causes the blister on surface of metal. Hence, Cu obtained is called blister copper. It is an impure copper.

Titanium is one of the elements found on the lunar surface, confirmed by analysis of moon samples brought back by Apollo missions. The moon contains various elements including titanium, iron, calcium, and others in different concentrations in the lunar regolith.

The Satavahana dynasty (1st century BCE - 3rd century CE) predominantly minted lead coins, though they also used copper and potin. Lead was abundant in their Deccan region. Gold coins were rare ( Kushans used gold), and silver coins came later with other dynasties. This reflects their regional economic conditions and metal availability.

 Tetrathiomolybdate is used as anti-copper agent in Wilson’s disease.

Lavosier classified the elements as metal and non metals.

Gallium is the present name of eka- aluminium.

Barium compounds produce green colors in fireworks. Different elements create different colored flames: barium gives green, copper produces blue, strontium gives red, and sodium yields yellow. This is based on the principle of flame emission spectroscopy where each element emits characteristic wavelengths of light when heated.

Tungsten has the highest melting point of all pure metals at approximately 3,422 degrees Celsius. This high melting point makes it the primary material used for filaments in incandescent light bulbs.

Barium sulphate is used for diagnostic X-rays.

Gold never tarnishes because it never reacts with oxygen.