CBSE Class 12 (Science) p-Block Elements (Groups 15-18) — practice questions
29 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) p-Block Elements (Groups 15-18) in the app →The radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:The minimum energy required to remove an electron from the ground state of a hydrogen atom is:The kinetic energy of an electron in the $n$-th Bohr orbit of a hydrogen atom is related to its total energy $Which spectral series of hydrogen lies entirely in the ultraviolet region?The hydrogen spectral lines that lie in the visible region of the electromagnetic spectrum belong to the:The major shortcoming of the Rutherford atomic model was that it could not explain:For a hydrogen-like ion of atomic number $Z$, the ground-state energy is:An electron in a hydrogen atom undergoes a transition from $n = 3$ to $n = 2$. The energy of the emitted photoGroup 16 of the periodic table is also known as the:The name chalcogen comes from the Greek word for:The most abundant element on earth is:Oxygen forms what share of the earth's crust by mass?Ozone is an allotropic form of which element?Ozone forms in the atmosphere at a height of about:The ozone layer shields the earth from radiation that is:Ozone is prepared by passing oxygen through an electrical discharge:Forming ozone from oxygen is a process that is:Pure ozone gas has which colour?Ozone becomes uncomfortable to breathe above about:Group 17 elements are collectively known as the:The halogens are described as highly reactive elements that are:Which two members of Group 17 are radioactive?The element of highest electronegativity of all is:Group 18 elements are all gases that are chemically:Group 18 elements are termed noble gases because they form very few:The noble gases make up what share of dry air by volume?The major constituent among the atmospheric noble gases is:The main commercial source of helium is:Which noble gases are the rarest of the group?