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If an aqueous solution of urea is 6% (w/v), then the volume of solution containing 2 moles of urea is N=14 u, H=1 u, C=12 u

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 60
Given the number: 161 cm; 0.161 cm; 0.0161 cm. The number of signification figures for three numbers are:
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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 61
There are two common oxides of Sulphur, one of which contains 50% O2 by weight, the other almost exactly 60%. The weights of Sulphur which combine with 1 g of O2 (fixed) are in the ratio of:
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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 62
Centigrade and Fahrenheit scales are related as:
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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 63
Which the following is not equal to 10-2 atm?
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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 64
Which among the following is not a basic postulate of Dalton's atomic theory?
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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 65
1.0 g of hydrogen contains 6×1023 atoms. The atomic weight of helium is 4. It follows that the number of atoms in 1 g of He is:
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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 66

A sample of aluminium has a mass of 54.0 g. What is the mass of the same number of magnesium atoms?

(At. wt. Al=27, Mg=24)

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 67
The number of atoms in 558.5 g of Fe (At. wt.=55.85) is: