Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 28

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Weight in grams of oxygen in $32.2 g {Na}_{2} {SO}_{4} \cdot 10 H_{2} O$ is:

(molecular weight of ${Na}_{2} {SO}_{4} . 10 H_{2} O = 322 g / mol$ )

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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 5>Q 29

Calculate the empirical formula of a compound "A" which is obtained from the catalytic hydrogenation of acetylene if this compound contains

85.7 %

carbon and

14.3 %

hydrogen (by wt.).

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 30

12 lit

. of

H_{2}

and

11.2 lit

. of

{Cl}_{2}

are mixed and exploded. The composition by volume of mixture is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 31

A sample of calcium carbonate

({CaCO}_{3})

has the following percentage composition

: Ca = 40 %, C =

12 %, O = 48 %

. If the law of constant proportions is true, then the weight of calcium in

4 g

of a sample of calcium carbonate obtained from another source will be?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 32

The copper metal reacts with Nitric acid based on the reaction

$3 Cu (s) + 8 {HNO}_{3} (aq) ⟶ 3 Cu {({NO}_{3})}_{2} (aq) + 2 NO (g) + 4 H_{2} O (l)$

If $18.75 g Cu {({NO}_{3})}_{2}$ is eventually obtained, then how many grams of Nitric oxide ( $NO$ ) would have also formed, according to the given equation?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 33

Which of the following is the best example of the law of conservation of mass:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 34

The molecular weight of a compound is

180 .

If its empirical formula is

{CH}_{2} O

then the molecular formula of the compound is?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 35

4 moles each of

{SO}_{2}

and

O_{2}

gases are allowed to react to form

{SO}_{3}

in a closed vessel. At equilibrium,

25 %

of

O_{2}

is used up. The total number of moles of all the gases at equilibrium is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 5>Q 36

1 .12 ml

of a gas is produced at

STP

by the action of

4 .12 mg

of alcohol, with methyl magnesium iodide. The molecular mass of alcohol is