KS3 - Ks3 Science - Reactions, Equations And Formulae 01 Solution - MCQGeeks.com

Q.1.

The formula for potassium nitrate is KNO . This means it contains:

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1 potassium atom, 1 nitrogen atom, 3 oxygen atoms
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1 potassium atom, 3 nitrogen atoms, 3 oxygen atoms
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3 potassium atoms, 3 nitrogen atoms, 3 oxygen atoms
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3 potassium atoms, 3 nitrogen atoms, 9 oxygen atoms

Q.2.

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

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1 calcium atom, 1 oxygen atom, 2 hydrogen atoms
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1 calcium atom, 2 oxygen atoms, 1 hydrogen atom
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1 calcium atom, 2 oxygen atoms, 2 hydrogen atoms
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2 calcium atoms, 2 oxygen atoms, 2 hydrogen atoms

Q.3.

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

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

Q.4.

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

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Hydrochloric acid and magnesium chloride
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Hydrogen and magnesium chloride
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Magnesium and hydrochloric acid
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Magnesium and hydrogen

Q.5.

2H SO means 2 molecules of sulfuric acid. They contain:

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2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
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4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
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4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms
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4 hydrogen atoms, 4 sulfur atoms, 8 oxygen atoms

Q.6.

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

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Aluminium
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Copper
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Tin
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Zinc

Q.7.

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

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Aluminium
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Iron
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Magnesium
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Zinc

Q.8.

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

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carbon dioxide, water
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zinc chloride, carbon dioxide
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zinc chloride, carbon dioxide, water
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zinc sulfate, carbon dioxide, water

Q.9.

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

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1 copper atom, 1 nitrogen atom, 6 oxygen atoms
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2 copper atoms, 2 nitrogen atoms, 3 oxygen atoms
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1 copper atom, 2 nitrogen atoms, 6 oxygen atoms
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2 copper atoms, 2 nitrogen atoms, 6 oxygen atoms

Q.10.

Which of the following is the correct balanced equation for the reaction between copper with oxygen from the air?

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2 Cu + O2 → Cu2O2
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2 Cu + O2 → 2 CuO
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Cu + O → CuO
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Cu + O2 → CuO2