The mass of $10$ molecules of ${\mathrm{H}}_2{\mathrm{SO}}_4$ is:
 

Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 38

An element is found in nature in two isotopic forms with mass numbers $(\mathrm{A}-1)$ and $(\mathrm{A}+3).$ If the average atomic mass of the element is found to be $\mathrm{A}$, then the relative abundance of the heavier isotope in the nature will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 39

A hypothetical element $\mathrm{Z}$ exists in nature as two isotopes ${}^{65}\mathrm{Z}$ and ${}^{67}\mathrm{Z}$ with their relative abundances $25\%$ and $75\%$ respectively. Then, the average atomic mass (in $\mathrm{u}$) of element $\mathrm{Z}$ is:
 

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 40

$1$ mole by definition represents same number of particles as:
 

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 41

$39.4\mathrm{kg}$ of gold was recovered from a smuggler. The number of atoms of gold recovered are:
 

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 42

$124 \mathrm{g}$ of ${\mathrm{P}}_4$ will contain which of the following:
(1) $4$ atoms of Phosphorus
(2) $4{\mathrm{N}}_{\mathrm{A}}$ atoms of Phosphorus
(3) $\mathrm{Na}$ molecules of Phosphorus
(4) $1$ molecule of Phosphorus

 

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 43

The total number of protons in $63 \mathrm{mg} {\mathrm{HNO}}_3$ is:
 

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 44

A gaseous mixture contains oxygen and sulphur dioxide in the ratio of $1 : 4$ by mass. Therefore, the ratio of their respective number of molecules is:
 

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 45

$1$ mole of ${\mathrm{C}}_2{\mathrm{H}}_6$ contains: