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11th CBSE
IMPORTANT
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Which of the following pairs have the same number of atoms?

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Important Questions on Some Basic Concepts of Chemistry

MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Multiple Choice Questions (Type-II)>Q 19
Which of the following solutions have the same concentration?
MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Multiple Choice Questions (Type-II)>Q 20
16 g of oxygen has same number of molecules as in
EASY
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Multiple Choice Questions (Type-II)>Q 21
Which of the following terms are unitless?
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11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Multiple Choice Questions (Type-II)>Q 22

One of the statements of Dalton’s atomic theory is given below:
“Compounds are formed when atoms of different elements combine in a fixed ratio”

Which of the following laws is not related to this statement?

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11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Short Answer Type>Q 23
What will be the mass of one atom of C-12 in grams?
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11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Short Answer Type>Q 24

How many significant figures should be present in the answer of the following calculations?

2.5×1.25×3.52.01

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11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Short Answer Type>Q 25
What is the symbol for SI unit of mole? How is the mole defined?
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11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 1 - Some Basic Concepts of Chemistry>Short Answer Type>Q 26

What is the difference between molarity and molality?