Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 116

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$10 g$ of a sample of a mixture of ${CaCl}_{2}$ and $NaCl$ is treated to precipitate all the calcium as ${CaCO}_{3}$ . This ${CaCO}_{3}$ is heated to convert all the $Ca$ to $CaO$ and the final mass of $CaO$ is $1.62 g$ . The percent by mass of ${CaCl}_{2}$ in the original mixture is.

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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 117

500 ml

of a gaseous hydrocarbon when burnt in excess of

O_{2}

gave

2.5

litre of

{CO}_{2}

and

3.0

litre of water vapours under the same conditions. Molecular formula of the hydrocarbon is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 118

If the atomic mass of Sodium is

23

, the number of moles in

46 g

of sodium is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 119

Which of the following would contain

1 mole

of particles?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 120

How many atoms are there in

100 amu

of

He

?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 121

Number of molecules of water in a drop of water weighing

0.09 g

are:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 122

The largest number of molecules is present in

1 g

of

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 123

The total number of

g - molecules

of

{SO}_{2} {Cl}_{2}

, in

13.5 g

of sulphuryl chloride is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 124

The number of sodium atoms in

2

moles of sodium ferrocyanide

({Na}_{4} [Fe (CN)_{6}])

is :