Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 23

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The hydrated salt ${Na}_{2} {SO}_{4} \cdot {nH}_{2} O$ loses all water of crystallization on heating and is reduced to $44.1 %$ of its original weight. Therefore, the value of n 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 2>Q 24

Sulphur trioxide is prepared by the following two reactions:

$\begin{array}{l} S_{8} (s) + 8 O_{2} (g) \to 8 {SO}_{2} (g) \\ 2 {SO}_{2} (g) + O_{2} (g) \to 2 {SO}_{3} (g) \end{array}$

How many grams of ${SO}_{3}$ are produced from $1 mol$ of $S_{8}$ ?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 25

Methyl

- t -

butyl ether,

C_{5} H_{12} O

, is added to gasoline to promote cleaner burning. How many moles of oxygen gas (

O_{2}

) are required to burn

1.0 mol

of this compound completely to form carbon dioxide and water?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 26

Maximum number of moles of barium phosphate formed when excess of barium chloride is mixed with $0.4 mole$ of sodium phosphate is:

${BaCl}_{2} + {Na}_{3} {PO}_{4} ⟶ {Ba}_{3} {({PO}_{4})}_{2} + NaCl$

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 27

In the reaction

2 {KClO}_{3} \to 2 KCl + 3 O_{2}

, when

36.75 g

of

{KClO}_{3}

is heated, the volume of oxygen evolved at NTP will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 28

One mole of potassium chlorate

({KClO}_{3})

is thermally decomposed and the gaseous product formed will react with excess of aluminium. How many moles of aluminium oxide

({Al}_{2}^{} O_{3})

are formed?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 29

Assuming that petrol is iso-octane

(C_{8} H_{18})

and has a density

0.8 g {mL}^{- 1}

. What will be the consumption of oxygen on complete combustion of

1.425 L

petrol?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 30

21.6 g

of silver coin is dissolved in

{HNO}_{3}

. When

NaCl

is added to this solution, all silver is precipitated as

AgCl

. The weight of

AgCl

is found to be

14.35 g

, then

%

of silver in coin is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 31

25.4 g

of iodine and

14.2 g

of chlorine are made to react completely to yield a mixture of

ICl

and

{ICl}_{3}

. Calculate the number of moles of

ICl

and

{ICl}_{3}

formed respectively.