Chemistry MCQs
Topic Notes: Chemistry
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
21
What is the geometry of a simple molecule with sp3 hybrid orbital?
Answer:
Tetrahedral
A simple molecule with an sp3 hybrid orbital has a tetrahedral geometry. In this hybridization, one s orbital and three p orbitals combine to form four sp3 hybrid orbitals. These orbitals then arrange themselves at the corners of a tetrahedron, resulting in a tetrahedral geometry around the central atom.
22
By combining n atmic orbitals no. of hybrid orbitals will be__________________?
Answer:
n
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23
What term is used to describe atoms of the same element that have the same atomic number but varying masses?
Answer:
Isotopes
Isotopes are atoms of the same element with the same atomic number (number of protons) but differing mass numbers (total protons and neutrons), resulting in varying atomic masses.
24
What occurs during sp3 hybridization?
Answer:
One s and 3 p-orbitals are involved
During sp3 hybridization, one s-orbital and three p-orbitals combine to form four hybrid orbitals, which are oriented in a tetrahedral arrangement.
25
Numbers of subatomic particles?
Answer:
more than 3
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26
When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?
Answer:
Iodine
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27
What leads to an increase in atomic radii within a group?
Answer:
Electronic shells
As we move down a group, the number of electronic shells increases, leading to a greater distance between the nucleus and the outermost electrons, resulting in an increase in atomic radii.
28
Which one has maximum number of unpaired electrons ?
Answer:
7Y
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29
What do 0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have in common?
Answer:
Both B and C
Both nitrogen gas and carbon monoxide gas have the same mass and number of atoms when measured in moles, given that they are both at standard temperature and pressure (STP).
30
A specie with maximum number of unpaired electrons ?
Answer:
NH-2
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