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
71
Which of the following gas laws shows the relationship of volume and number of gas particles?
Answer:
Avogadro Law
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72
What substance has an octane number of 0?
Answer:
n-heptane
The octane number is a measure of a fuel's resistance to engine knocking. The scale is based on the comparison of the fuel to iso-octane, which is assigned a value of 100. A value of 0 indicates that the fuel is highly prone to engine knocking and has no octane rating.
73
Number of carbon atoms per molecule in fuel oil is
Answer:
50 to 70
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74
Which range of atomic numbers corresponds to the actinide series of elements?
Answer:
89 to 103
Actinides are a series of radioactive elements located in the f-block of the periodic table. They possess atomic numbers ranging from 89 (actinium) to 103 (lawrencium).
75
Mass spectrometer is used to determine Mass number of isotopes and___________________?
Answer:
Relative abundance
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76
The number of moles of solute dissolved in 1L or 1 dm3 of a solution is called.
Answer:
Molarity
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77
What are the compounds called where water molecules are added?
Answer:
Hydrates
In chemistry, hydrates are compounds that have water molecules (H2O) within their crystal structure, often forming when a salt or metal reacts with water. This results in the formation of a stable compound with a specific number of water molecules attached. Hydrates are common in minerals and can have significant effects on the physical properties of a substance.
78
Mass number of an element represents sum of number of
Answer:
Protons and Neutrons
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