Non - Metals Free MCQ Practice Test with solutions, SSC CGL General Awareness

The key characteristics of non-metals include being brittle and poor conductors of heat and electricity. These properties differentiate non-metals from metals, which are typically malleable and good conductors of heat and electricity.

Bromine is highlighted as the only liquid non-metal. This unique characteristic sets it apart from other non-metals like chlorine, xenon, and argon, which exist in gaseous states.

Silicon finds extensive use in the production of semiconductors and computer chips due to its unique electrical properties. These materials are fundamental in modern electronics, forming the basis of various technologies we use daily, such as computers, smartphones, and other electronic devices. Silicon's ability to conduct electricity under specific conditions makes it invaluable in the semiconductor industry, driving innovations in computing and technology.

Nitrogen plays a crucial role in the growth and development of plant and animal proteins, essential for sustaining life on Earth. Constituting a significant portion of the Earth's atmosphere, nitrogen is involved in various biological processes, including the creation of amino acids, the building blocks of proteins. Its presence is crucial for the functioning of ecosystems and agricultural practices, emphasizing its importance in maintaining life on our planet.

Ozone in the atmosphere plays a crucial role in protecting life on Earth by blocking harmful ultraviolet (UV) radiation from the sun. This protective layer of ozone absorbs and scatters the majority of incoming UV radiation, preventing it from reaching the Earth's surface in harmful amounts. Without this ozone layer, increased UV exposure could lead to various health issues, including skin cancer and damage to ecosystems, highlighting the critical role ozone plays in maintaining a habitable environment.

The most stable form of Sulphur at room temperature is Rhombic Sulphur. This allotrope transitions to this form from other allotropes over time, making it the predominant form of Sulphur under normal conditions.

Sulphuric Acid (H₂SO₄) is famously known as the "king of chemicals". It is a strong oxidizing and dehydrating agent, and it finds applications in various industries such as fertilizer production, explosives, and drug manufacturing.

Chlorine, discovered by Scheele in 1774, is always found in nature as chlorides like sodium chloride and potassium chloride. It is a yellow-green, pungent, toxic gas, commonly used as a disinfectant and bleaching agent in various industries.

Noble gases stand out from other elements due to their possession of completely filled valence shells. This characteristic makes them chemically inert and stable. The full valence shell renders noble gases unreactive under normal conditions, which is a unique feature compared to other elements.

Graphene, an allotrope of carbon with a one-atom-thick planar sheet structure, is known for its exceptional conductivity and strength. Graphene's unique properties have made it a promising material for various applications, including touch screens, LCDs, LEDs, and other advanced technologies.

The most stable and common molecular form of oxygen is dioxygen (O2). This form of oxygen is characterized by being colorless, odorless, and tasteless. It is essential for supporting combustion and is a key component of the atmosphere, making up approximately 21% of the air by volume. Dioxygen is crucial for aerobic organisms and plays a vital role in various processes, including respiration and combustion.

Noble gases are characterized by their completely filled valence shells, which make them chemically inert. This means they are stable and unlikely to form chemical bonds with other elements. This unique property gives them their name "noble gases."

Phosphine (PH3) is a colorless, toxic gas with a distinctive rotten fish odor, commonly used in applications such as smoke screens and warfare due to its toxic properties. Despite its hazardous nature, phosphine finds use in various industrial processes, including fumigation, where its toxicity can be leveraged for pest control and other specialized applications.