01. Atomic, Molecular and Equivalent Masses
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Some Basic Concepts of Chemistry

228244 A sample of oxygen contains two isotopes of oxygen with masses $16 \mathrm{u}$ and $18 \mathrm{u}$ respectively. The proportion of these isotopes in the sample is $3: 1$. What will be the average atomic mass of oxygen in this sample?

1 $17.5 \mathrm{u}$
2 $17 \mathrm{u}$
3 $16 \mathrm{u}$
4 $16.5 \mathrm{u}$
NDA (II)-2018
Some Basic Concepts of Chemistry

228245 Assertion : Equal moles of different substances contain same number of constituent particles.
Reason: Equal weights of different substance contain the same number of constituent particles.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2017
Some Basic Concepts of Chemistry

228247 The most abundant elements by mass in the body of a healthy human adult are Oxygen (61.4\%); of healthy Carbon (22.9\%), Hydrogen $(10.0 \%)$; and Nitrogen (2.6\%). The weight which a $75 \mathrm{~kg}$ person would gain if all ${ }^1 H$ atoms are replaced by ${ }^2 \mathbf{H}$ atoms is

1 $15 \mathrm{~kg}$
2 $37.5 \mathrm{~kg}$
3 $7.5 \mathrm{~kg}$
4 $10 \mathrm{~kg}$
[JEE Main-2017]
Some Basic Concepts of Chemistry

228248 The compound $\mathrm{Na}_2 \mathrm{CO}_3$. $\mathrm{xH}_2 \mathrm{O}$ has $50 \% \mathrm{H}_2 \mathrm{O}$ by mass. The value of " $x$ " is

1 4
2 5
3 6
4 7
5 8
Kerala-CEE-2017
NEET DIGITAL LIBRARY
Some Basic Concepts of Chemistry

228244 A sample of oxygen contains two isotopes of oxygen with masses $16 \mathrm{u}$ and $18 \mathrm{u}$ respectively. The proportion of these isotopes in the sample is $3: 1$. What will be the average atomic mass of oxygen in this sample?

1 $17.5 \mathrm{u}$
2 $17 \mathrm{u}$
3 $16 \mathrm{u}$
4 $16.5 \mathrm{u}$
NDA (II)-2018
Some Basic Concepts of Chemistry

228245 Assertion : Equal moles of different substances contain same number of constituent particles.
Reason: Equal weights of different substance contain the same number of constituent particles.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2017
Some Basic Concepts of Chemistry

228247 The most abundant elements by mass in the body of a healthy human adult are Oxygen (61.4\%); of healthy Carbon (22.9\%), Hydrogen $(10.0 \%)$; and Nitrogen (2.6\%). The weight which a $75 \mathrm{~kg}$ person would gain if all ${ }^1 H$ atoms are replaced by ${ }^2 \mathbf{H}$ atoms is

1 $15 \mathrm{~kg}$
2 $37.5 \mathrm{~kg}$
3 $7.5 \mathrm{~kg}$
4 $10 \mathrm{~kg}$
[JEE Main-2017]
Some Basic Concepts of Chemistry

228248 The compound $\mathrm{Na}_2 \mathrm{CO}_3$. $\mathrm{xH}_2 \mathrm{O}$ has $50 \% \mathrm{H}_2 \mathrm{O}$ by mass. The value of " $x$ " is

1 4
2 5
3 6
4 7
5 8
Kerala-CEE-2017
Join With Us for More Updates
Some Basic Concepts of Chemistry

228244 A sample of oxygen contains two isotopes of oxygen with masses $16 \mathrm{u}$ and $18 \mathrm{u}$ respectively. The proportion of these isotopes in the sample is $3: 1$. What will be the average atomic mass of oxygen in this sample?

1 $17.5 \mathrm{u}$
2 $17 \mathrm{u}$
3 $16 \mathrm{u}$
4 $16.5 \mathrm{u}$
NDA (II)-2018
Some Basic Concepts of Chemistry

228245 Assertion : Equal moles of different substances contain same number of constituent particles.
Reason: Equal weights of different substance contain the same number of constituent particles.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2017
Some Basic Concepts of Chemistry

228247 The most abundant elements by mass in the body of a healthy human adult are Oxygen (61.4\%); of healthy Carbon (22.9\%), Hydrogen $(10.0 \%)$; and Nitrogen (2.6\%). The weight which a $75 \mathrm{~kg}$ person would gain if all ${ }^1 H$ atoms are replaced by ${ }^2 \mathbf{H}$ atoms is

1 $15 \mathrm{~kg}$
2 $37.5 \mathrm{~kg}$
3 $7.5 \mathrm{~kg}$
4 $10 \mathrm{~kg}$
[JEE Main-2017]
Some Basic Concepts of Chemistry

228248 The compound $\mathrm{Na}_2 \mathrm{CO}_3$. $\mathrm{xH}_2 \mathrm{O}$ has $50 \% \mathrm{H}_2 \mathrm{O}$ by mass. The value of " $x$ " is

1 4
2 5
3 6
4 7
5 8
Kerala-CEE-2017
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Some Basic Concepts of Chemistry

228244 A sample of oxygen contains two isotopes of oxygen with masses $16 \mathrm{u}$ and $18 \mathrm{u}$ respectively. The proportion of these isotopes in the sample is $3: 1$. What will be the average atomic mass of oxygen in this sample?

1 $17.5 \mathrm{u}$
2 $17 \mathrm{u}$
3 $16 \mathrm{u}$
4 $16.5 \mathrm{u}$
NDA (II)-2018
Some Basic Concepts of Chemistry

228245 Assertion : Equal moles of different substances contain same number of constituent particles.
Reason: Equal weights of different substance contain the same number of constituent particles.

1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
AIIMS-2017
Some Basic Concepts of Chemistry

228247 The most abundant elements by mass in the body of a healthy human adult are Oxygen (61.4\%); of healthy Carbon (22.9\%), Hydrogen $(10.0 \%)$; and Nitrogen (2.6\%). The weight which a $75 \mathrm{~kg}$ person would gain if all ${ }^1 H$ atoms are replaced by ${ }^2 \mathbf{H}$ atoms is

1 $15 \mathrm{~kg}$
2 $37.5 \mathrm{~kg}$
3 $7.5 \mathrm{~kg}$
4 $10 \mathrm{~kg}$
[JEE Main-2017]
Some Basic Concepts of Chemistry

228248 The compound $\mathrm{Na}_2 \mathrm{CO}_3$. $\mathrm{xH}_2 \mathrm{O}$ has $50 \% \mathrm{H}_2 \mathrm{O}$ by mass. The value of " $x$ " is

1 4
2 5
3 6
4 7
5 8
Kerala-CEE-2017