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
1
What is the weight of the المعدن that forms a chloride with a mass of 0.475g, equivalent to 12?
Answer:
0.18
We are given that the weight of the equivalent of 12 (unknown weight) forms 0.475g of chloride. Let's call the unknown weight 'x'. The ratio of the weights of the unknown to the equivalent is 12:x. According to the problem, this ratio equals the ratio of the masses of the chlorides (0.475g):(x). So we have: 12/x = 0.475/x Now, we can solve for x: 12x = 0.475x^2 Rearrange the equation to form a quadratic equation: x^2 - 12x + 0.475 = 0 This is a quadratic equation, and we can solve it using the quadratic formula: x = (0.285 +- sqrt(0.285^2 - 4*12*0.475))/2*12 x ≈ 0.18 and x ≈ 2.68 Since the weight cannot be negative, the correct answer is approximately 0.18 grams, which corresponds to the fourth option (0.18g).
2
A real gas obeying vander waals equation will resemble the ideal gas if_______________________?
Answer:
Both a and b are small
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