Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 18

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A compound $X$ and $Y$ have equal mass of them. If their atomic weights are $30$ and $20$ , respectively. The molecular formula of that compound (its mol. wt. is $120$ ) could be:

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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 19

1

litre of a hydrocarbon weighs as much as one litre of

{CO}_{2}

at same

P

and

T

. Then the molecular formula of the hydrocarbon is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 20

64 g

of an organic compound has

24 g

of carbon and

8 g

of hydrogen and the rest is oxygen. The empirical formula of the compound is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 21

Cystine has a sulphur content of

26.7 %

. If its molecule contains two atoms of sulphur, what is its molecular weight?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 2>Q 22

Percentage of

Se

in peroxidase anhydrous enzyme is

0.5 %

by weight (at. wt.

= 78.4

), then minimum molecular weight of peroxidase anhydrous enzyme is:

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

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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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:

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