CBSE Class 12 p-Block Elements (Groups 15-18) — practice questions
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Practice CBSE Class 12 p-Block Elements (Groups 15-18) in the app →Rutherford's alpha-particle scattering experiment led to the conclusion that the atom:According to Bohr's postulate, the angular momentum of an electron in the $n$-th allowed orbit of a hydrogen-lThe radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:The total energy of an electron in the $n$-th orbit of a hydrogen atom is given by $E_n = -13.6/n^2\,\text{eV}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 $The Rydberg formula for the wavelength of radiation emitted when an electron in a hydrogen atom jumps from levWhich 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:The product of that preparation is called: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?