Chemistry - Study Mode
[#731] Two electrons in an orbital are differentiated by which of the following ?
Correct Answer
(B) Spin quantum number
Explanation
Solution: Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that “no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other.
[#732] When cathode rays strike a target of high atomic weight, they give rise to
Correct Answer
(C) X-rays
Explanation
Solution: When cathode rays strike a solid target of high atomic weight and high melting point such as tungsten, molybdenum, etc, they give rise to a highly penetrating radiation called the X-rays (LIT Physics by Dr. P.K Agarwal).
[#733] How many electrons can be accommodated in d-orbital?
Correct Answer
(D) 10
Explanation
Solution: 10 electrons can be accommodated in d-orbital.
[#734] The scientist who experimentally proved the existence of positron is
Correct Answer
(B) Anderson
Explanation
Solution: In 1932 Carl Anderson, a young professor at the California Institute of Technology in the US, was studying showers of cosmic particles in a cloud chamber and saw a track left by "something positively charged, and with the same mass as an electron".
[#735] The antiparticle of an electron is
Correct Answer
(A) Positron
Explanation
Solution: The positron is the antiparticle to the electron. The positron has the same rest mass as the electron but opposite charge, one positive elementary charge.