Question # 1

The number of isotopes of carbon are

Choose an answer

1

2

3

5

L shell can accommodate ________________ electrons.

Choose an answer

2

8

18

32

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

Choose an answer

h/2π

n 2h/π

n h2/2π

n h/2π

Neuron was discovered by

Choose an answer

Sir Willium Crooks

Goldstein

James Chadwik

Neil Bohr

In 9th century scientist accepted by:

Choose an answer

Dalton

Bohars

Rutherford

Nil

In ________________ Bohr considered hydrogen atom for his model .

Choose an answer

1913

1916

1917

1918

The value of Planck's constant is

Choose an answer

6.63 x 10-34 Js

6.63 x 10-32 Js

6.63 x 10-30 Js

6.63 x 10-28 Js

The lowest energy level is

Choose an answer

K

L

M

N

The boiling point of H2O is:

Choose an answer

100

12

1.105

9

Atoms of elements combine chemically to form:

Choose an answer

Mixtures

compounds

solutions

ions

The p subshell has:

Choose an answer

one orbital

two orbitals

three orbitals

four orbitals

Who discovered the proton?

Choose an answer

Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

Half life of C-14 ________________ years.

Choose an answer

5800

5700

5600

5500

More Classes

Other Links

Chemistry 9th Class English Medium Unit 2 Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer