Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 17

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The percentage of $Se$ in peroxidase anhydrous enzyme is $0.5 %$ by weight (atomic weight $= 78.4$ ). Then minimum molecular weight of peroxidase anhydrous enzyme 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 4>Q 18

The mass of carbon anode consumed (giving only carbon dioxide) in the production of

270 kg

of aluminium metal from bauxite by the Hall process is:
(Atomic mass:

Al = 27

)

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 19

An element $X$ has the following isotopic composition:

${}^{200}X : 90 % {}^{199}X : 8.0 % {}^{202}X : 2.0 %$

The weighted average atomic mass of the naturally occurring element $X$ is closest to

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 20

How many moles of Lead $(II)$ Chloride will be formed from a reaction between $6.5 g$ of $PbO$ and $3.2 g$ of $HCl$

Given the atomic mass of $(Pb = 207.2)$

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 21

An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave

C = 38.71 %

and

H_{2} =

9.67 %

. The empirical formula of the compound would be:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 22

What volume of oxygen gas

(O_{2})

measured at

0 ° C

and

1 atm

is needed to burn completely

1 L

of propane gas

(C_{3} H_{8})

measured under the same conditions?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 23

Volume occupied by one molecule of water (density

= 1 g {cm}^{- 3}

) is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 24

10 g

of hydrogen and

64 g

of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be ?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 4>Q 25

25.3 g

of sodium carbonate,

{Na}_{2} {CO}_{3}

is dissolved in enough water to make

250 mL

of solution. If sodium carbonate dissociates completely, the molar concentration of sodium ion,

{Na}^{+}

and carbonate ions,

{CO}_{3}^{2 -}

are respectively (Molar mass of

{Na}_{2} {CO}_{3} = 106 g {mol}^{- 1}

):