Advanced level 2026 South West mock Chemistry 1

This image contains a set of Chemistry multiple-choice questions (1 through 13). Here is the extracted data in plain text:

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Chemistry Questions (1–13)

1. The definition: “It is the number of times the average mass of one atom of an element is heavier than $1/12\text{th}$ the mass of an isotope of carbon-12″ refers to:

• A: Molar mass

• B: Relative molecular mass

• C: Relative formula mass

• D: Relative atomic mass

2. An $\alpha$-particle is incident on a nuclide Z and it produces a nuclide Y and two beta as represented in the reaction below:

$_{37}^{88}Z + _{2}^{4}He \rightarrow \text{ } _s^rY + 2\beta$

Which of the following is correct?

• A: $r=92, s=35$

• B: $r=90, s=37$

• C: $r=90, s=39$

• D: $r=92, s=41$

3. The first six ionization energies in kJ/mol of an element X are: 787, 1577, 3230, 5355, 16090, 19795. A compound formed between X and chlorine could be:

• A: $X_4Cl$

• B: $X_2Cl$

• C: $XCl_4$

• D: $X_4Cl_2$

4. Identify the group 2 hydroxide which is most soluble in water.

• A: $Mg(OH)_2$

• B: $Sr(OH)_2$

• C: $Ca(OH)_2$

• D: $Ba(OH)_2$

5. The intermolecular force existing in a halogen molecule is:

• A: Permanent dipole attraction

• B: Induced dipole attraction

• C: Van der Waals forces

• D: Hydrogen bonding

6. Identify a physical property of elements that decreases across the periodic table from Group I to IV.

• A: First ionization energy

• B: Atomic radius

• C: Electronegativity

• D: Melting points

7. For an organic molecule to be optically active, it must:

• A: Contain a symmetric carbon atom

• B: Contain a chiral carbon atom

• C: Must NOT be chemically identical

• D: Possess multiple bonds

8. A drug filtrate was obtained after the sodium fusion test. On addition of dilute nitric acid and aqueous silver nitrate to a portion of the filtrate, a white precipitate is observed. The precipitate indicates the presence of:

• A: Sulphur

• B: Chlorine

• C: Iodine

• D: Nitrogen

9. Identify a pair of group IV (14) chlorides which exist as solids at room temperature.

• A: $SnCl_2$ and $SnCl_4$

• B: $SiCl_4$ and $GeCl_4$

• C: $SnCl_2$ and $PbCl_4$

• D: $GeCl_2$ and $SnCl_2$

10. Which statement is correct as concern sulphur dioxide in the atmosphere?

• A: It acts only as a reducing agent

• B: It contributes to acid rain by forming $H_2SO_3$ and $H_2SO_4$.

• C: It dissolves in rainwater to form carbonic acid

• D: It causes lightning

11. What is observed when chlorine gas is bubbled through a solution of potassium bromide?

• A: Reddish-brown solution forms

• B: A yellow solution forms

• C: A purple solution forms

• D: A colourless solution remains

12. Which of the following is/are produced when ethanoyl chloride reacts with water?

• A: Ethanal + HCl

• B: Ethanoic acid + $Cl_2$

• C: Ethanol + HCl

• D: Ethanoic acid + HCl

13. The Bromide anion ($_{35}^{80}Br^-$) consists of:

• A: 35 electrons and 35 neutrons

• B: 35 protons and 45 electrons

• C: 80 protons and 80 electrons

• D: 36 electrons and 45 protons