In which case is number of molecules of water maximum?

Important Questions on Some Basic Concepts of Chemistry

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 20

$2 \mathrm{g}$ mixture of two divalent metals $\mathrm{A}$ (at $\mathrm{wt}=30$ amu) and $\mathrm{B}$ (at $\mathrm{wt}=15$ amu), on reacting with dilute $\mathrm{HCl}$ solution, gives $2.24$ $\mathrm{L} {\mathrm{H}}_2$ gas at $\mathrm{NTP}$, then composition of $\mathrm{A}$ is (in $\mathrm{g}$):

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 21

An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave $\mathrm{C}=38.71\%$ and ${\mathrm{H}}_2=$$9.67 \%$. The empirical formula of the compound would be:

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 22

In Duma's method of estimation of nitrogen $0.35 \mathrm{g}$ of an organic compound gave $55 \mathrm{mL}$ of nitrogen collected at $300 \mathrm{K}$ temperature and $715 \mathrm{mm}$ pressure. The percentage composition of nitrogen in the compound would be: (Aqueous tension at $300 \mathrm{K}=15 \mathrm{mm}$ )

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 23

The heat of combustion of carbon to ${\mathrm{CO}}_2$ is $-393.5 \mathrm{KJ} {\mathrm{mole}}^{-1}$. The heat released upon formation of $35.2 \mathrm{g} {\mathrm{CO}}_2$ from carbon and oxygen gas is _________.

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 24

Which of the following is dependent on temperature?

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-III (Analytical Questions)>Q 2

Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer (Atomic masses:$\mathrm{O}=16, \mathrm{Cu}=63$ and $\mathrm{N}=14)$
$\mathrm{I}. 1$ molecule of oxygen.
$\mathrm{II}. 1$ atom of nitrogen.
$\mathrm{III}.$ $1\times {10}^{-10} \mathrm{g}$ molecular weight of oxygen.
$\mathrm{IV}.$ $1\times {10}^{-10} \mathrm{g}$ atomic weight of copper.

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-III (Analytical Questions)>Q 4

The maximum number of molecules is present in

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-III (Analytical Questions)>Q 5

How many moles of magnesium phosphate, $\mathrm{Mg}{\left({\mathrm{PO}}_4\right)}_2$ will contain $0.25$mole of oxygen atoms?