Free Printable Chemistry Class 9 Unit 1

1.

The branch of Chemistry which deals with substances containing $carbon$ is called ___________________ .

a)

Organic

b)

Inorganic

c)

Industrial

d)

Analytical

2.

Biochemistry deals with ___________________

a)

changes in $living\ \ organisms$

b)

$laws\ \&\ theories$

c)

use of technology

d)

chemicals & toxic substances

3.

The production of useful substances by use of technology is studied under which branch of chemistry?

a)

Biochemsitry

b)

Analytical Chemistry

c)

Environmental Chemsitry

d)

Industrial Chemistry

4.

Carbon containing compounds such as $CO_2^{ }$ & $bicarbonates$ are studied in ___________________.

a)

Organic Chemistry

b)

Inorganic Chemsitry

c)

Analytical Chemistry

5.

The method and instrument used to measure the $Melting\ \&\ Boiling\ point$ of a substance is studied under ______________.

a)

Industrial Chemistry

b)

Biochemistry

c)

Environmental Chemistry

d)

Analytical Chemistry

6.

Identify the branch of chemistry:
An analyst determines that $NO_2$ is responsible for acid rain. (a)

7.

Identify the branch of chemistry: $\alpha-particles$ when bombarded on nitrogen atom, a proton is emitted. (a) .

8.

Identify the branch of chemistry: Gases can be compressed by applying pressure. (a)

9.

A substance whose all the atoms have same atomic number is called ____________________.

a)

Element

b)

Molecule

c)

Compound

10.

Properties of a compound are __________________ the properties of elements from which they are formed.

a)

same as

b)

different from

11.

Air is an example of __________________.

a)

Mixture

b)

Element

c)

Compound

12.

A mixture that consists of only one phase is called _______________ mixture.

a)

Homogeneous

b)

Heterogeneous

13.

Which of the following is an example of $Heterogeneous\ Mixture$ .

a)

oil & water

b)

salt & water

c)

sugar & water

14.

Atomic number = _______________

a)

No. of protons

b)

No. of neutrons

c)

Protons + Neutrons

15.

Mass Number = _____________

a)

No. of protons

b)

No. of electrons

c)

No. of neutrons

d)

Protons + Neutrons

16.

The $atomic\ no.$ of an element is $19$ and its $mass\ no.$ is $39$ . What is the no. of $neutrons$ ?

a)

19

b)

39

c)

58

d)

20

17.

The mass exactly equal to $\frac{1}{12}th$ the mass of $C-12$ atom is called _____________.

a)

weight

b)

atomic mass

c)

relative atomic mass

18.

The chemical formula which gives the simplest $whole\ no.\ ratio$ of atoms of each element is called

a)

Molecular formula

b)

Empirical formula

19.

Calculate the formula mass of $KCl$ . (Atomic mass of $K=39$ , $Cl=35.5$ )

a)

74.5

b)

4.5

c)

90

20.

Which term is used for $ionic\ compounds$ ?

a)

Formula mass

b)

Molecular mass

21.

Calculate the molecular mass of $H_2O$ . ( Atomic mass of $H=1$ , $O=16$ )

a)

17

b)

18

c)

14

22.

Anion has _____________ charge while Cation has ____________ charge.

a)

$positive\ ;\ negative$

b)

$negative\ ;\ positive$

23.

An $ionic\ compound$ has ___________ charge.

a)

Positive

b)

Negative

c)

No charge

24.

A $free\ radical$ is ________________.

a)

positively charged

b)

negatively charged

c)

neutral

25.

The mass of $one\ MOLE$ of a substance is called _________.

a)

atomic mass

b)

formula mass

c)

molar mass

d)

molecular mass

26.

Which formula is correct to calculate the $No.\ of\ moles$ ?

a)

$No.\ of\ moles=\frac{mass\ in\ grams}{molar\ mass}$

b)

$No.\ of\ moles=\frac{molar\ mass}{mass\ in\ grams}$

c)

$No.\ of\ moles=\frac{mass\ in\ kg}{molar\ mass}$

27.

The mass of $CO_2$ is $44g$ . Then the molar mass of $1\ mole$ of $CO_2$ will be:

a)

44

b)

22

c)

88

28.

If the mass of $H_2O$ in a glass is $36g$ . then calculate the $no.\ of\ moles$ if the $molar\ mass$ of $H_2O$ is $18g$ . HINT: use the following formula: $No.\ of\ moles=\frac{Mass\ in\ g}{Molar\ mass}$

a)

2 moles

b)

0.5 moles

c)

5 moles

Chemistry Class 9 Unit 1

Total questions: 28

Worksheet time: 21mins

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