On the atomic scale, the atomic weight of Ca is 40 u . If one u is redefined as per the question, which of the following would be correct?

Atomic weight of Ca is 70 if one amu is defined as 1 / 21 st of weight of an atom of C - 12

Atomic weight of Ca is 60 if one amu is defined as 1 / 15 th of weight of an atom of C - 12

Atomic weight of Ca is 80 if one amu is defined as 1 / 30 th by weight of an atom of C - 12

EASY

JEE Main

IMPORTANT

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Two oxides of metal contain $50 %$ and $40 %$ metal respectively. If the formula of the first oxide is ${MO}_{2}$ , the formula of the second oxide will be:

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Important Questions on Some Basic Concepts, Mole Concept and Stoichiometry

EASY

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 13

If isotopic distribution of

C^{12}

and

C^{14}

98.0 %

and

2.0 %

, respectively, then the number of

C^{14}

atoms in

12 g

of carbon sample will be:

EASY

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 14

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/are not related to this statement?

EASY

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 15

Which of the statements are true?

EASY

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 16

Which of the following statements are correct?

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 17

Which of the statements are true about the law of chemical combination?

EASY

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 18

Which of the following pair of compounds illustrate the law of multiple proportions?

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.2>Q 19

On the atomic scale, the atomic weight of

Ca

40

u

. If one

u

is redefined as per the question, which of the following would be correct?

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 1

Drug marijuana owes its activity to tetrahydrocannabinol, which contains $70 %$ as many as carbon atoms as hydrogen and $15$ times as many hydrogen atoms as oxygen. In a gram of tetrahydrocannabinol, the number of moles is $0.00318$ . Determine its molecular formula.

Two oxides of metal contain 50% and 40% metal respectively. If the formula of the first oxide is MO2, the formula of the second oxide will be:

Important Questions on Some Basic Concepts, Mole Concept and Stoichiometry

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Two oxides of metal contain $50 %$ and $40 %$ metal respectively. If the formula of the first oxide is ${MO}_{2}$ , the formula of the second oxide will be: