Chemistry - Study Mode
[#776] Which of the following is a secondary pollutant ?
Correct Answer
(B) CO
Explanation
Solution: CO (Carbon monoxide) is a secondary pollutant.
[#777] Ultraviolet radiation striking the earth is due to the depletion of
Correct Answer
(C) Ozone
Explanation
Solution: Ultraviolet radiation striking the earth is due to the depletion of ozone.
[#778] Many people died in London in 1952 as result of air pollution producing
Correct Answer
(C) Smog
Explanation
Solution: Many people died in London in 1952 as result of air pollution producing smog.
[#779] The nuclear particle having no mass and no charge, but only spin is
Correct Answer
(B) Neutrino
Explanation
Solution: Neutrinos do not carry electric charge, and have mass quite small, though non-zero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin.
[#780] The orientation of an atomic orbital is governed by
Correct Answer
(B) Magnetic quantum number
Explanation
Solution: Quantum numbers may be defined as a set of four numbers which give complete information about the electron in an atom, i.e., energy, orbital occupied, size, shape and orientation of that orbital and the direction of electron spin. Magnetic quantum number is required to explain the fact that when the source giving the line spectrum is placed in a magnetic field, each spectral line splits in to a number of lines. The magnetic quantum number tells the number of orientations which the orbitals present within the same sub-shell can take up.