Elementary School: 3rd, 4th & 5th Grade - Science - Reactions, Equations And Formulae Solution - MCQGeeks.com

Q.1.

In the following reaction which are the products Mg + 2HCl → H + MgCl ?

100%
Hydrochloric acid and magnesium chloride
0%
Hydrogen and magnesium chloride
0%
Magnesium and hydrochloric acid
0%
Magnesium and hydrogen

Q.2.

2H SO means 2 molecules of sulphuric acid. They contain .......

100%
2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
0%
4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
0%
4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms
0%
4 hydrogen atoms, 4 sulfur atoms, 8 oxygen atoms

Q.3.

When zinc carbonate reacts with dilute hydrochloric acid the products are .......

100%
carbon dioxide, water
0%
zinc chloride, carbon dioxide
0%
zinc chloride, carbon dioxide, water
0%
zinc sulfate, carbon dioxide, water

Q.4.

The formula for potassium nitrate is KNO . This means .......

100%
1 potassium atom, 1 nitrogen atom, 3 oxygen atoms
0%
1 potassium atom, 3 nitrogen atoms, 3 oxygen atoms
0%
3 potassium atoms, 3 nitrogen atoms, 3 oxygen atoms
0%
3 potassium atoms, 3 nitrogen atoms, 9 oxygen atoms

Q.5.

Which of the following is the correct balanced equation?

100%
2 Cu + O2 → Cu2O2
0%
2 Cu + O2 → 2 CuO
0%
Cu + O → CuO
0%
Cu + O2 → CuO2

Q.6.

Which of the following metals do NOT react with water or steam?

100%
Aluminium
0%
Copper
0%
Tin
0%
Zinc

Q.7.

The formula for calcium hydroxide is Ca(OH) . This means .......

100%
1 calcium atom, 1 oxygen atom, 2 hydrogen atoms
0%
1 calcium atom, 2 oxygen atoms, 1 hydrogen atom
0%
1 calcium atom, 2 oxygen atoms, 2 hydrogen atoms
0%
2 calcium atoms, 2 oxygen atoms, 2 hydrogen atoms

Q.8.

The formula for copper nitrate is Cu(NO ) . This means .......

100%
1 copper atom, 1 nitrogen atom, 6 oxygen atoms
0%
1 copper atom, 2 nitrogen atoms, 3 oxygen atoms
0%
1 copper atom, 2 nitrogen atoms, 6 oxygen atoms
0%
2 copper atoms, 2 nitrogen atoms, 6 oxygen atoms

Q.9.

Which of the following metals is the most reactive with acids?

100%
Aluminium
0%
Iron
0%
Magnesium
0%
Zinc

Q.10.

During a chemical reaction new substances are formed from old ones. Which of the following is NOT true?

100%
New substances can be changed back to the original ones
0%
The total mass of products = total mass of reactants
0%
There is often a color change
0%
There is often a temperature change