WorksheetsAtoms & Molecules Part 1
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
The formula of a chloride of a metal M is MCl3, the formula of the phosphate of metal M will be
a)
b)
M2PO4
c)
M3PO4
d)
M2(PO4)3
2.
The ratio of H:O by mass in hydrogen peroxide (H2O2) is
a)
16:1
b)
1:8
c)
1:32
d)
1:16
3.
Which has the largest number of molecules?
a)
54 g of N205
b)
28 g of CO2
c)
36 g of H2O
d)
46 g of C2H5OH
4.
The molecular formula of zinc phosphate is
a)
Zn(PO4)3
b)
Zn2PO4
c)
Zn3(PO4)2
d)
ZnPO4
5.
The accepted unit of atomic mass and molecular mass is
a)
amu
b)
g
c)
kg
d)
g mol-1
6.
Valence of noble gases is
a)
1
b)
0
c)
2
d)
none of these
7.
The number of atoms of hydrogen present In 1 mole of ethyne (C2H2) is
a)
4 ×6.023×1023
b)
2×6.023×1023
c)
6.023×1023
d)
8×6.023×1023
8.
The law of definite proportions was proposed by
a)
John Dalton
b)
Richter
c)
Joseph Proust
d)
A. Lavoisier
9.
The reference standard used for defining atomic mass unit is
a)
H
b)
C-12
c)
C-13
d)
C-14
10.
The element whose gram-atomic mass and gram-molecular mass are the same is
a)
argon.
b)
nitrogen.
c)
oxygen.
d)
hydrogen.
11.
The mass percentage of hydrogen (H) in water is
a)
11.11
b)
1.11
c)
88.88
d)
8.88
12.
The ratio of H:O by mass in water is
a)
1:8
b)
8:1
c)
2:1
d)
1:2
13.
The indivisibility of atom was proposed by
a)
de Broglie.
b)
Bohr.
c)
Rutherford.
d)
Dalton.
14.
Copper reacts with oxygen to form two oxides, Cu2O and CuO
a)
63.5 : 16
b)
63.5 : 8
c)
2:1
d)
1:2
15.
The modern atomic symbols were proposed by
a)
Bohr.
b)
Dalton.
c)
Berzelius.
d)
none of these
100 %
