NCERT Class 9 Science-Atoms and Molecules[Molecular Mass and Mole Concept] [NCERT Based General Studies (GS)]: Questions 1 - 5 of 6
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Question 1
Question MCQ▾
What is a mole?
Choices
| Choice (4) | Response | |
|---|---|---|
a. | It is a link between mass of atoms and number of atoms. | |
b. | It is a link between mass of molecules and number of molecules. | |
c. | Mole is a practical SI unit of the amount of a substance | |
d. | All a., b. and c. are correct | |
Question 2
Question MCQ▾
Avogadro՚s constant is defined as:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | No of moles | |
b. | 6.022 × 1023 particles | |
c. | Number of atoms present in 12 gram of C-12 | |
d. | Both b. and c. are correct | |
Question 3
Question MCQ▾
The word mole is introduced by:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Wilhelm Ostwald | |
b. | Dalton | |
c. | Antoine Laurent Lavoisier | |
d. | Question does not provide sufficient data or is vague | |
Question 4
Question MCQ▾
Advantages of Mole concept are:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | It is an important tool for dealing with chemical calculations | |
b. | Any number of atoms and molecules can be selected conveniently | |
c. | Both a. and b. are correct | |
d. | None of the above | |
Question 5
Question MCQ▾
Molecular mass is a:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Is the relative mass of its molecules as compared with one twelfth mass of a carbon -12 atom taken as 12 units | |
b. | Mass of a molecule | |
c. | Both a. and b. are correct | |
d. | None of the above | |