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

HARD

Earn 100

Law of multiple proportions is illustrated by one of the following pairs

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Important Questions on Atomic Structure

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Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

Select the correct statements from the following :

A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is $9.10939 \times 10^{- 31} kg$ .
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.

Choose the correct answer from the options given below:

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Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

Which of the following conclusions could not be derived from Rutherford's

α

-particle scattering experiment:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The statement related to law of definite proportions is

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

HARD

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

A pressure cooker reduces cooking time for food because:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

When burnt in air,

14.0 g

mixture of carbon and sulphur gives a mixture of

{CO}_{2}

and

{SO}_{2}

in the volume ratio of

2 : 1

(volumes being measured at the same conditions of temperature and pressure). Number of moles of carbon in the mixture is

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

1.08 g

of copper wire was allowed to react with nitric acid. The resulting solution was dried and ignited when

1.35 g

of copper oxide was obtained. In another experiment

2.30 g

of copper oxide was heated in presence of hydrogen yielding

1.84 g

of copper. Find the percentage of

C u

and oxygen in

C u O

in both the cases

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

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?

Law of multiple proportions is illustrated by one of the following pairs

Important Questions on Atomic Structure

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