KS3 - Ks3 Science - Compounds 01 Solution - MCQGeeks.com

Q.1.

A compound is a substance which contains .......

0%
only one type of atom
40%
only two types of atom
10%
two or more chemicals which can be easily separated
50%
two or more elements chemically joined together

Q.2.

The number of different elements in calcium carbonate (CaCO ) is .......

14%
2
86%
3
0%
4
0%
5

Q.3.

Which of the following could have been formed by reacting iron with sulfur?

0%
Iron oxide
0%
Sulfuric iron
100%
Iron sulfide
0%
Sulfuric acid

Q.4.

The formula of methane is CH . Which of these is true?

43%
A molecule of methane contains five atoms
0%
A molecule of methane contains five different elements
43%
An atom of methane contains two different elements
14%
Methane contains five molecules

Q.5.

Which of these is NOT a compound?

14%
Carbon monoxide
43%
Chlorine
29%
Hydrochloric acid
14%
Propane

Q.6.

How many atoms in the formula CuSO ?

50%
3
17%
4
33%
6
0%
7

Q.7.

The correct formula for carbon tetrachloride is .......

0%
C3Cl
25%
C4Cl
25%
CCl3
50%
CCl4

Q.8.

The smallest particle of carbon dioxide (CO ) that still has the properties of carbon dioxide is called .......

60%
a molecule
20%
a proton
20%
an atom
0%
an ion

Q.9.

Which of these word equations is INCORRECT?

0%
Copper + oxygen → copper oxide
50%
Hydrogen + chlorine → hydrogen chlorine
25%
Iron + chlorine → iron chloride
25%
Magnesium + oxygen → magnesium oxide

Q.10.

Which is the correct formula equation?

0%
Mg + O → MgO
25%
Mg + O2 → MgO2 →
0%
2 Mg + O2 → Mg2O2
75%
2 Mg + O2 → 2 MgO