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$4.88 g$ of $K C l O_{3}$ when heated produced $1.92 g$ of $O_{2}$ and $2.96 g$ of $KCl$ . Which of the following statements regarding the experiments is correct?

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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

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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

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?

HARD

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

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}

EASY

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

A pressure cooker reduces cooking time for food because:

EASY

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

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

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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

EASY

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?

MEDIUM

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

EASY

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

How many g of 'S' is required to produce

10 g o f H_{2} S O_{4}

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.

EASY

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

6.3 g

{NaHCO}_{3}

are added to

15 g

C H_{3} C O O H

solution, the residue is found to weight

18 g

. What is the mass of

{CO}_{2}

released in the reaction?

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

HARD

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.

4.88 g of KClO3 when heated produced 1.92 g of O2 and 2.96 g of KCl. Which of the following statements regarding the experiments is correct?

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

$4.88 g$ of $K C l O_{3}$ when heated produced $1.92 g$ of $O_{2}$ and $2.96 g$ of $KCl$ . Which of the following statements regarding the experiments is correct?