Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 22

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If $1 g$ of $HCl$ and $1 g$ of ${MnO}_{2}$ heated together the maximum weight of ${Cl}_{2}$ gas evolved will be: $[{MnO}_{2} + 4 HCl \to {MnCl}_{2} + {Cl}_{2} + 2 H_{2} O]$ (Atomic weight of Cl=35.5u)

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Important Questions on Some Basic Concepts of Chemistry

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 23

Molarity of

H_{2} {SO}_{4}

is

18 M

. Its density is

1.8 g / {cm}^{3}

, hence molality is:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 24

If

1 \frac{1}{2}

moles of oxygen combine with

Al

to form

{Al}_{2} O_{3}

, the weight of

Al

used in the reaction is

(Al = 27)

:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 27

A spherical ball of radius $7 cm$ contains $56 %$ iron. If density is $1.4 \frac{g}{{cm}^{3}}$ , number of $mol$ of $Fe$ present approximately is: ( $π = 22 / 7$ )(Atomic mass of Fe=56u)

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 29

The density of

2.45 M

aqueous methanol

({CH}_{3} OH)

is

0.976 g / mL

. What is the molality of the solution ?

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 30

Equal volumes of

10 % (v / v)

of

HCl

is mixed with

10 % (v / v) NaOH

solution. If density of pure

NaOH

is

1.5

times that of pure

HCl

then the resultant solution be?

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 32

What is the molar mass of diacidic organic Lewis base, if

12 g

of chloroplatinate salt on ignition produced

5 g

residue?

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 33

Solutions containing

23 g HCOOH

is/are:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 34

5.0 g

of a sample containing

{({NH}_{4})}_{2} {SO}_{4} &

inert impurity

(X)

was boiled with excess of

NaOH

and the

{NH}_{3} (g)

so produced was absorbed in

200 ml

of

0.5 {MH}_{2} {SO}_{4}

solution in another vessel. The unreacted

H_{2} {SO}_{4}

required

400 ml

of

0.4 M

solution of

NaOH

for exact neutralization. Calculate weight

%

of nitrogen in given sample.