Total Questions: 50
Argon is a noble gas. It is used in arc welding as it shows low reactivity with metals. During welding, there is no chemical change. But at high temperatures, the metal reacts with atmospheric oxygen to form oxides.
Acetylene is an organic gas with the chemical formula C₂H₂. This gas combines with oxygen to form oxyacetylene, which is used in welding metals.
Inert gases are chemically inert. These are also called noble gases. They are members of group 18 of the periodic table. Like helium, argon, neon, etc., are inert gases.
Ammonium (NH₄⁺) is a cation, while fluoride (F⁻), chloride (Cl⁻), and iodide (I⁻) are anions of halogens (group 17 elements).
The unit of pressure, i.e., force/area, is newton/m², and 1 newton/m² = 1 Pascal (Pa). Meter is the unit of distance. Hence, option (d) is wrong.
Osmium is the densest element ever known on Earth. The symbol for osmium is 'Os,' and the atomic number is 76. It is the transition element of the platinum group, which is very hard.
Xenon gas is used as an anesthetic agent. The symbol of Xenon is 'Xe,' and the atomic number of Xenon is 54.
Noble gases are also called inert gases. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are inert gases. Boron is not an inert gas but a non-metallic element.
The 'Rn' symbol is the symbol for the element Radon. It is a colorless, tasteless gas. Radon is included in the category of noble gases, which is the 18th group of the periodic table. Its atomic number is 86, and its atomic weight is 222.
Of all the gases, the lightest gas is hydrogen, and the second lightest gas is helium. Radon is the heaviest gas.
