Free Printable Chemistry 9 Unit 2

1.

Which of the following particles were used by Rutherford in his experiment?

a)

$\alpha-particles$

b)

$\beta-particles$

c)

$\gamma-rays$

d)

electrons

2.

The few $\alpha-particles$ deflected in Rutherford experiment were due to:

a)

electrostatic repulsion

b)

electrostatic attraction

c)

gravitational force

d)

electromagnetic force

3.

From his experiment, Rutherford proposed which model for an atom?

a)

Planetary Model

b)

Plum Pudding Model

c)

Billiard Ball Model

4.

The mass of an atom is concentrated in ______________.

a)

Nucleus

b)

Electrons

c)

Protons

d)

Shells

5.

Which spectrum is obtained for an atom?

a)

Continuous spectrum

b)

Line spectrum

6.

The charge on NUCLEUS is ____________.

a)

Positive

b)

Negative

c)

No charge

7.

According to Bohr, ORBIT was also called ______________.

a)

Sub-shell

b)

Energy Level

c)

Quark

8.

When an electron is present in a particular orbit, it ______________.

a)

radiates energy

b)

does not radiate energy

9.

When an electron jumps to higher orbit, it ________________ energy.

a)

absorbs

b)

releases

10.

Following model is called :

a)

Bohr's Model

b)

Rutherford Model

c)

Chadwick Model

11.

Isotopes differ in ______________________.

a)

Chemical Properties

b)

Physical Properties

c)

No. of electrons

d)

No. of protons

12.

Hydrogen has ______ isotopes,

a)

2

b)

3

c)

4

13.

Heavy Water contains which isotope of Hydrogen?

a)

Protium

b)

Deutrium

c)

Tritium

14.

$_6^{12}C$ contains 6 Protons and 6 neutrons while $_6^{13}C$ contains:

a)

6 protons & 7 neutrons

b)

7 protons & 6 neutrons

c)

6 protons & 7 electrons

15.

Which of the following $Cl$ isotope has greater occurrence in nature?

a)

$Cl-35$

b)

$Cl-37$

16.

Uranium isotopes have different _____________________.

a)

protons

b)

neutrons

c)

atomic mass

d)

both neutrons & atomic mass

17.

Chemical properties of an element depend on no. of _____________.

a)

electrons

b)

protons

c)

neutrons

d)

both electrons & protons

18.

The arrangement of electrons in ________________ is called $electronic\ configuration$ .

a)

shells

b)

orbits

c)

energy level

d)

sub-shells

19.

"Electrons fill the lowest energy level available first". This statement is called ____________________

a)

Auf Bau Principle

b)

Hund's rule

c)

Henry's law

d)

Periodic law

20.

Which sub-shell can accommodate $10$ electrons?

a)

s

b)

p

c)

d

d)

f

21.

Which of the following shell will be filled first?

a)

$3d$

b)

$5s$

c)

$4s$

d)

$4f$

22.

Which uranium isotope is used in nuclear reactors?

a)

$_{92}^{235}U$

b)

$_{92}^{234}U$

c)

$_{92}^{238}U$

Chemistry 9 Unit 2

Total questions: 22

Worksheet time: 22mins

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