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11th CBSE
IMPORTANT
Earn 100

If 1021 molecules are removed from 200 mg of CO2, then the number of moles of CO2 left is

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Important Questions on Some Basic Concepts of Chemistry

HARD
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 11
The weight of a molecule of the compound C60H122 is:
HARD
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 12
10 dm3 of N2 gas and 10 dm3 of gas X at the same temperature contains the same number of molecules. The gas X is
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 13
How many moles of electrons weight one kilogram?
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 14
The total number of electrons in 18 mL of waterdensity=1 g mL-1 is
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 15
A gas mixture contains 50 % helium and 50 % methane by volume. What is the percentage by weight of methane in the mixture?
EASY
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 16
If we consider that 16, in place of 112, the mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of substance will
HARD
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 17
A person has as many notes as number of oxygen atoms in 24.8 g Na2S2O3.5H2O (mol. wt. =248). A note counting machine count 48 million notes per day. How many days it would it take to count these notes?
HARD
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 18
Number of moles in 1 m3 at STP are