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

EASY

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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.

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Important Questions on Atomic Structure

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 conclusions could not be derived from Rutherford's

α

-particle scattering experiment:

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:

MEDIUM

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

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

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

MEDIUM

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

The statement related to law of definite proportions is

MEDIUM

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?

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

State the law of multiple proportions.

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

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>Atomic Structure>Atomic Models

Avogadro's hypothesis states that

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

The mass of nitrogen per gram hydrogen in the compound hydrazine is exactly one and half times the mass of nitrogen in the compound ammonia. The fact illustrates the

EASY

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

The law of definite proportions is not applicable to nitrogen oxide because

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Atomic Models

How many g atoms of S are present