Complete the following table: Atom Mass number Atomic number Number of neutrons Na 11 23 11 Cl 17 35 35 Co 27 60 33

Mass number of Sodium = 23 . Mass number = Number of protons + Number of neutrons. Number of neutrons = Mass number - Number of protons = 23 - 11 = 12 . Mass number of Chlorine = 35 . Atomic number of chlorine = 17 . (Atomic number = number of protons). Mass number = Number of protons + Number of neutrons. Number of neutrons = Mass number - Number of protons = 35 - 17 = 18 . Atomic number of cobalt = 27 . (Atomic number = number of protons). Mass number = Number of protons + Number of neutrons = 27 + 33 = 60 . Atom Mass number Atomic number Number of neutrons 23 11 12 35 17 18 60 27 33

Fill the missing data in the given table: Species H 2 O CO 2 Na atom MgCl 2 Property (Physical) No.of moles 2 mol 0 . 5 mol No.of particles 3 . 011 × 10 23 Mass 36 g 115 g

For H 2 O : Number of moles = Given mass/ Gram molecular mass Number of moles of H 2 O = 36 g 18 g = 2 mol Number of particles in 1 mole of H 2 O = 6 . 022 × 10 23 Number of particles in 2 moles of H 2 O = 6 . 022 × 10 23 × 2 = 12 . 044 × 10 23 For CO 2 : 6 . 022 × 10 23 particles are present in 1 mole of CO 2 Therefore, 3 . 011 × 10 23 particles are present in 0 . 5 mole of CO 2 . Also, the number of moles = Given mass / Gram molecular mass So, mass of 0 . 5 moles of CO 2 = Given mass of CO 2 44 g Mass of CO 2 = 0 . 5 × 44 g = 22 g For Na atom: Given mass of sodium atom = 115 g Gram atomic mass of Na = 23 g Therefore, the number of moles of Na = 115 g 23 g = 5 mol Number of particles of Na atom = 5 × 6 . 022 × 10 23 = 30 . 11 × 10 23 For MgCl 2 : Number of moles = 0 . 5 moles Mass of MgCl 2 = Number of moles × Gram molecular mass of MgCl 2 = 0 . 5 × 95 . 2 g = 47 . 6 g Number of particles in 1 mole of MgCl 2 = 6 . 022 × 10 23 Therefore, the number of particles in 0 . 5 moles of MgCl 2 = 3 . 011 × 10 23 Species H 2 O CO 2 Na atom MgCl 2 Property (Physical) Liquid Gas Solid Solid No. of moles 2 mol 0 . 5 mol 5 mol 0 . 5 mol No. of particles 12 . 044 × 10 23 3 . 011 × 10 23 30 . 11 × 10 23 3 . 011 × 10 23 Mass 36 g 22 g 115 g 47 . 6 g

E M B I B E

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 7

MEDIUM

9th CBSE

IMPORTANT

Earn 100

Classify the following question into osmosis/diffusion:

Preserving pickles in salt.

Important Questions on Sample Paper

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 7

Classify the following into osmosis/diffusion:

Spreading of smell of cake being baked throughout the house.

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 7

Classify the following into osmosis/diffusion:

Aquatic animals using oxygen dissolved in water during respiration.

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 8

Complete the following table:

Atom	Mass number	Atomic number	Number of neutrons
${}_{11}^{23}{Na}$		$11$
${}_{17}^{35}{Cl}$	$35$
${}_{27}^{60}{Co}$			$33$

HARD

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 9

Fill the missing data in the given table:

Species	$H_{2} O$	${CO}_{2}$	$Na$ atom	${MgCl}_{2}$
Property (Physical)
No.of moles	$2 mol$			$0.5 mol$
No.of particles		$3.011 \times 10^{23}$
Mass	$36 g$		$115 g$

HARD

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 9

Which has more number of atoms?

$100 g of N_{2} or 100 g of {NH}_{3} .$

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 10

The following substances are added to water kept in a beaker.
(i) Kerosene (ii) Sugar (iii) Soap (iv) Milk
Choose the mixture which is a
(a) Colloidal solution
(b) True solution
(c) Immiscible liquids

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 11

You are given a mixture of sulphur powder and iron filings and asked to heat it. What will you observe?

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 5>Q 11

What will you observe when zinc granules are added to dilute sulphuric acid?