part =4 Major Metals
Total Questions: 50
Selenium is a non-metallic element (Non-Metal). Its atomic number is 34 and it belongs to group 16 of the periodic table. All other elements given in the options are metals,
Galena (PbS) is an ore of lead (Pb), which is sulfide in origin. Lead is not found in nature in metallic form, but it is obtained from galena ores.
Sulphur, also known as 'brimstone', is a pale crystalline solid that burns with a blue-yellow flame. It is used in making gunpowder.
Gold is the least reactive metal in comparison to metals like copper, iron, and magnesium. The chemical element gold has the symbol Au and the atomic number 79.
Copper is moistened with carbon dioxide (CO₂). On reaction, a brownish-green surface is formed, this is due to the formation of copper carbonate
Mercury is used as the base metal of amalgam alloy.
Lead is a poor conductor of heat among the given metals.
Mercury metal (Hg) or mercury is found in the liquid state at room temperature.
Antiperspirant deodorant contains a mixture of different aluminium compounds as active ingredients. For example, aluminium chlorohydrate, aluminium chloride, etc.
Calcium is the most reactive metal among the given metals. It reacts with water to produce hydrogen and calcium hydroxide [Ca(OH),] is formed.
