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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Calculate the mass of 0.5 mole of N₂gas

12 g

18 g

16 g

14 g

Which of the following contains maximum number of molecules?

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

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

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

What is the symbol of cobalt?

The chemical symbol for nitrogen gas is:

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

Which of the following has maximum number of atoms?

10.

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

11.

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

2 : 17 : 35

3 : 18 : 36

4 : 19 : 38

1 : 16 : 32

12.

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

23 : 76

24 : 71

28 : 79

29 : 72

13.

What is the symbol of helium?

14.

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

15.

The chemical symbol for sodium is:

16.

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

13 : 1 : 8

14 : 2 : 9

12 : 3 : 8

11 : 4 : 7

17.

Calculate the mass of 0.5 mole of N atoms

7 g

9 g

11 g

12 g

18.

What is the mass of 1 mole of nitrogen atoms.

16 g

14 g

18 g

20 g

19.

What is the mass of 0.5 mole of water molecules?

7.0 g

8.0 g

9.0 g

6.0 g

20.

What is the mass of 0.2 mole of oxygen atoms?

3.2 g

4.5 g

3.1 g

2.2 g

21.

Calculate the relative molecules mass of water. (H₂O)

15 u

18 u

17 u

19 u

22.

How many atoms are present in a H₂S molecule?

23.

Mass of one atom of oxygen is:

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.

25.

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

10 : 3 : 12

11 : 4 : 13

12 : 5 : 15

14 : 6 : 17

26.

Which of the following would weigh the highest?

27.

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

28.

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

14 : 3

15 : 2

16 : 4

17 : 8

29.

Calculate the molecular mass of HNO_3.

61 u

63 u

65 u

67 u

30.

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

Time's up

Time is Up!

CONSTRUCTIONS	QUADRILATERALS	POLYNOMIALS	Quiz on polynomials
CIRCLES	WORK AND ENERGY	WHY DO WE FALL ILL
STRUCTURE OF ATOM

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