9 CBSE Quiz on Atoms and Molecules

Welcome to your 9 CBSE QUIZ-1 ATOMS AND MOLECULES (SCIENCE)

Good luck for the Quiz!!!

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Compute the difference in masses of 10³ moles each of magnesium atoms and magnesium ions. (Mass of an electron = 9.1*10 ^-31kg)

A change in the physical state can be brought about:

Only when energy is given to the system

Only when energy is taken out from the system

When energy is either given to, or taken out from the system

Without any energy change

None

The chemical symbol for nitrogen gas is:

What is the mass of 0.5 mole of water molecules?

7.0 g

8.0 g

9.0 g

6.0 g

None

What is the ratio by mass of the combining elements in MgCl₂?

23 : 76

24 : 71

28 : 79

29 : 72

None

A sample of vitamin C is known to contain 2.58 x 10²⁴ oxygen atoms. How many moles of oxygen are present in the sample?

3.24 moles

4.28 moles

5.29 moles

2.27 moles

None

What is the ratio by mass of the combining elements in Ca(OH)₂?

20 : 16 : 1

21 : 17 : 4

23 : 19 : 5

24 : 15 : 3

None

How many atoms are present in a H₂S molecule?

None

Which of the following contains maximum number of molecules?

10.

A change in the physical state can be brought about:

Only when energy is given to the system

Only when energy is taken out from the system

When energy is either given to, or taken out from the system

Without any energy change

None

11.

The visible universe is estimated to contain 10²² stars. How many moles of stars are present in the visible universe?

0.0166 moles

0.0177 moles

0.0155 moles

0.0144 moles

None

12.

What is the mass of 0.2 mole of oxygen atoms?

3.2 g

4.5 g

3.1 g

2.2 g

None

13.

Which of the following would weigh the highest?

14.

What is the ratio by mass of the combining elements in H₂SO₄?

2 : 17 : 35

3 : 18 : 36

4 : 19 : 38

1 : 16 : 32

None

15.

What is ratio by mass of the combining elements in CaCO₃?

10 : 3 : 12

11 : 4 : 13

12 : 5 : 15

14 : 6 : 17

None

16.

Hydrogen and oxygen combine in the ratio 1 : 8 by mass to form water. What weight of oxygen gas would be required to react completely with 3 g of hydrogen gas?

25 g

26 g

28 g

24 g

None

17.

Calculate the relative molecules mass of water. (H₂O)

15 u

18 u

17 u

19 u

None

18.

What is the mass of 1 mole of nitrogen atoms.

16 g

14 g

18 g

20 g

None

19.

The chemical symbol for sodium is:

None

20.

Mass of one atom of oxygen is:

21.

Calculate the mass of 0.5 mole of N atoms

7 g

9 g

11 g

12 g

None

22.

Calculate the mass of 0.5 mole of N₂gas

12 g

18 g

16 g

14 g

None

23.

Calculate the molecular mass of HNO_3.

61 u

63 u

65 u

67 u

None

24.

Which of the following statement is not true about an atom?

Atoms are not able to exist independently.

Atoms are the basic units from which molecules and ions are formed.

Atoms are always neutral in nature.

Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

None

25.

3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:

26.

What is the ratio by mass of the combining elements in NH₃?

14 : 3

15 : 2

16 : 4

17 : 8

None

27.

What is the symbol of cobalt?

None

28.

What is the symbol of helium?

None

29.

Which of the following has maximum number of atoms?

30.

What is the ratio by mass of the combining elements in C₂H₅OH?

13 : 1 : 8

14 : 2 : 9

12 : 3 : 8

11 : 4 : 7

None

Time's up

Time is Up!

CONSTRUCTIONS	QUADRILATERALS	POLYNOMIALS	Quiz on polynomials
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STRUCTURE OF ATOM

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