Which of the following is correct for C ( g r a p h i t e ) + O 2 ( g a s ) → C O 2 , heat = - 348 kJ?

Mass of product = Mass of reactant

Mass of product < Mass of reactant

Mass of product > Mass of reactant

The following data are obtained when nitrogen and oxygen react together to form different oxides: Mass of nitrogen Mass of oxygen a. 14 g 16 g b. 14 g 32 g c. 28 g 80 g Which law of chemical combination is obeyed by the above experimental data? Give the statement of the law.

Nitrogen and oxygen combine together to form different oxides. The mass ratio of these compounds is given in the above table. Thus, different masses of oxygen which combine with a fixed mass of nitrogen. The law illustrated in the given table is the Law of multiple proportions. The law of multiple proportions states that when two elements combine to form two or more compounds, then the different masses of one element, which combine with a fixed mass of the other element, bear a simple whole-number ratio with another.

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Given $3 g$ of carbon reacts with $1 g$ of hydrogen to form ${CH}_{4}$ and $8 g$ of oxygen reacts with $1 g$ of hydrogen to form $H_{2} O$ . Similarly, $12 g$ of carbon reacts with $32 g$ of oxygen to form carbon dioxide. In both cases the ration of carbon and oxygen is 3 : 8. Which of the following laws illustrate the given example?

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Important Questions on Some Basic Concepts of Chemistry

EASY

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

The statement related to law of definite proportions is

MEDIUM

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

Which of the following have same number of significant figures?
(A)

0.00253

(B)

1.0003

(C)

15.0

(D)

163

Choose the correct answer from the options given below

MEDIUM

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

EASY

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

EASY

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

MEDIUM

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?

EASY

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

Which of the following is an example of Law of multiple proportion?

EASY

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

Which of the following equation does not obey the law of conservation of mass?

EASY

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

One gram mole of a gas at NTP occupies 22.4 L. This fact was derived from

EASY

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

The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. This illustrates the law of.

EASY

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

Avogadro's hypothesis states that

EASY

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

20.8 g of

B a C l_{2}

on reaction with 9.8 g of

H_{2} S O_{4}

produces 7.3 g of

H C l

and some amount of

B a S O_{4}

. The amount of

B a S O_{4}

formed is

EASY

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)

EASY

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

State the law of multiple proportions.

EASY

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.

MEDIUM

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}

EASY

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

Which of the following is correct for

C (g r a p h i t e) + O_{2} (g a s) \to C O_{2}

, heat =

-

348 kJ?

EASY

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

Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

MEDIUM

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

The following data are obtained when nitrogen and oxygen react together to form different oxides:

Mass of nitrogen	Mass of oxygen
a. $14 g$	$16 g$
b. $14 g$	$32 g$
c. $28 g$	$80 g$

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

EASY

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

Important Questions on Some Basic Concepts of Chemistry

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