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The of an elementary substance is defined as the number of atoms of the element present in a molecule of that element.

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

Among the following pairs of compounds, the one that does not illustrate the law of multiple proportions, is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

A bicycle tyre is filled with air having pressure of

270 kPa

27 ° C

. The approximate pressure of the air in the tyre when the temperature increases to

36 ° C

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

56.0 L

of nitrogen gas is mixed with excess of hydrogen gas and it is found that

20 L

of ammonia gas is produced, The volume of unused nitrogen gas is found to be_____

L

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

The statement related to law of definite proportions is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

By heating

200 g

of metal carbonate,

112 g

of metal oxide on a gaseous compound are produced. Vapour density of the gaseous compound is

22

. How many moles of gaseous compound is produced in the reaction?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

The Following data are obtained when dinitrogen and dioxygen react together to form different compounds.

	Mass of dinitrogen	Mass of dioxygen
(i)	14 g	16 g
(ii)	14 g	32 g
(iii)	28 g	32 g
(iv)	28 g	80g

Which law of chemical combination is obeyed by the above experimental data?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

When

2 g

of gas

A

is introduced into an evacuated flask kept at

25^{°} C

, the pressure is

1 atm

. If

3 g

of another gas

B

is then added to the same flask, the pressure becomes

1.5 atm

. Assuming an ideal gas behaviour, calculate the ratio of molecular mass

M_{A} : M_{B}

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

20.8 g

of barium chloride on reaction with

9.8 g

H_{2} S O_{4}

produces

7.3 g

H C l

and some amount of

B a S O_{4}

. The amount of

B a S O_{4}

formed is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

Carbon combines with oxygen to form two oxides. The carbon content in one of the oxides is

42.9 %

while in the other oxide it is

27.3 %

. Show that these data are in agreement with the law of multiple proportions.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

How many g atoms of S are present

i n 4.9 g H_{2} S O_{4}

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

8 l i t r e o f H_{2}

and

6 l i t r e o f C l_{2}

are allowed to react to maximum possible extent. Find out the final volume of reaction mixture. Suppose

P a n d T

remains constant throughout the course of reaction.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

One part of an element

A

combines with two parts of another element

B

. 6 parts of element

C

combines with 4 parts of

B

. If

A

and

C

combine together, the ratio of their weights, will be governed by

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

0.607 g

of silver salt of Tribasic acid was quantitatively reduced to

0.370 g

pure-Ag. Calculate molecular mass of tribasic acid

$R H_{3} \overset{{AgNO}_{3}}{⟶} R {Ag}_{3} \overset{1 g nition}{⟶} Ag$

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

20 mL

mixture of

CO

and

{CO}_{2}

is mixed with

X mL

oxygen and is electrically sparked leaving no reactants. The volume after the explosion is

(16 + X) mL

under the same conditions. What is the residual volume when

30 mL

of original mixture is treated with aqueous

NaOH

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

A 100 mL mixture of CO and CO₂ is passed through a tube containing red hot charcoal. The volume now becomes 160 mL. The volumes are measured under the same conditions of temperature and pressure. Amongst the following, select the correct statement (s).

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

Carbon and oxygen are known to form two compounds. The carbon content in one of these is

42.9 %

while in the other it is

27.3 %

. Find the ratio of amounts of

C r e a c t i n g w i t h s a m e m a s s o f O

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

n

gram of a substance

X

reacts with

m

gram of substance

Y

to form

p

gram of substance

R

and

q

gram of substance

S

. This reaction can be represented as follows

X + Y = R + S

The relation which can be established in the amounts of the reactants and the products will be

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

20 {cm}^{3}

mixture of

CO

{CH}_{4}

and

He

gases were exploded by an electric discharge at room temperature with excess oxygen. The volume contraction was found to be

13.0 {cm}^{3}

. A further contraction of

14.0 {cm}^{3}

occurred when the residual gas was treated with

KOH

solution. Find out the composition of

{CH}_{4}

in the mixture in terms of volume percentage.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

In a chemical reaction

2 A (s) + B (s) \to 3 C (s) + D (s)

. If

4 g

A

are added to

6 g

of B and after completion of reaction

y g

mass is present in the vessel. What is the value of

y

? (Assume no reactant is left after reaction)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Laws of Chemical Combination

State the law of multiple proportions.

The of an elementary substance is defined as the number of atoms of the element present in a molecule of that element.

Important Questions on Some Basic Concepts of Chemistry

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