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
101
What is the atomicity of nitrogen?
Answer:
2
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102
In benzene sulfonic acid, the sulfonic group is attached to the benzene ring through which atom?
Answer:
Sulphur
In benzene sulfonic acid, the sulfonic group (-SO3H) is attached to the benzene ring through the sulfur atom. The sulfur atom is connected to the benzene ring and then bonds with the oxygen atoms to form the sulfonic group. The correct option is 'Sulphur'.
103
Uptake of Nitrogen in the Neem tree is in the form of
Answer:
Organic compounds prepared by bacteria from atmospheric nitrogen.
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104
What is the primary source of oxygen that sustains life on Earth?
Answer:
Water
Oxygen is a byproduct of photosynthesis, a process in which plants, algae, and some bacteria convert sunlight, water, and CO2 into glucose and oxygen. This oxygen is released into the atmosphere, making water the ultimate source of oxygen that supports life.
105
What is the molecular formula of methane gas?
Answer:
CH4
The molecular formula of methane gas (CH4) represents one carbon atom bonded to four hydrogen atoms. Comparing the options given, CH4 is the only one that matches this description. Ammonia (NH3) has one nitrogen atom and three hydrogen atoms, carbon dioxide (CO2) has one carbon atom and two oxygen atoms, and benzene (C6H6) has six hydrogen atoms and one carbon atom in a benzene ring.
106
What is air classified as?
Answer:
Mixture
Air is a blend of various gases, primarily nitrogen (78%), oxygen (21%), and other trace gases like argon, carbon dioxide, and neon. Since it consists of different gases combined together, air is classified as a mixture.