Silicon(IV) oxide reacts with chlorine and carbon to form liquid silicon(IV) chloride, SiCl4, and carbon dioxide gas. If the reaction is carried out at r.t.p., which symbol equation represents this reaction?

SiO2(s) + 2Cl2(g) + C(s) → SiCl4(l) + CO2(g)

SiO2(l) + 2Cl2(g) + C(s) → SiCl4(l) + CO2(g)

SiO2(l) + 2Cl2(g) + C(g) → SiCl4(l) + CO2(g)

SiO2(s) + 2Cl2(g) + C(s) → SiCl4(g) + CO2(g)

Two different substances are electrolysed using inert electrodes in two separate experiments. Hydrogen is produced in both experiments. Which row identifies the two substances and the electrode at which hydrogen is produced?

D. dilute sulfuric acid | concentrated hydrochloric acid | cathode

A. molten sodium chloride | aqueous sodium chloride | anode

B. molten sodium chloride | aqueous sodium chloride | cathode

C. dilute sulfuric acid | concentrated hydrochloric acid | anode

Aqueous copper(II) sulfate can be electrolysed using either carbon electrodes or copper electrodes. Which statement describes what happens at the positive electrode?

Oxygen gas is produced if the electrode is made from carbon.

Copper is deposited if the electrode is made from carbon.

Copper is deposited if the electrode is made from copper.

Oxygen gas is produced if the electrode is made from copper.

Which statement about a hydrogen–oxygen fuel cell is not correct?

The reaction that takes place is endothermic.

Chemical energy is converted into electrical energy.

Water is the only chemical product.

Which row describes a reaction where the overall energy change is exothermic?

energy needed for breaking bonds = 600 kJ, energy released by forming bonds = 1200 kJ, temperature of the surroundings = decreases

energy needed for breaking bonds = 600 kJ, energy released by forming bonds = 300 kJ, temperature of the surroundings = decreases

energy needed for breaking bonds = 900 kJ, energy released by forming bonds = 300 kJ, temperature of the surroundings = increases

energy needed for breaking bonds = 900 kJ, energy released by forming bonds = 1200 kJ, temperature of the surroundings = increases

Which process involves a physical change only?

heating calcium carbonate strongly

In the Haber process, an equilibrium is established. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) The forward reaction is exothermic. Which change to the reaction conditions will move the position of equilibrium to the left?

decreasing the pressure by 100 atm

decreasing the temperature by 100 °C

adding more nitrogen gas to the mixture

Which statement about reactants in redox reactions is correct?

When the oxidation number of one element increases, a different element loses electrons.

An oxidising agent donates electrons, and a reducing agent accepts electrons.

When one element gains electrons, the oxidation number of a different element increases.

When the oxidation number of one element increases, a different element gains oxygen.

Which statement about dilute hydrochloric acid is correct?

It is a strong acid as it fully dissociates.

It is a strong acid as it partially dissociates.

It is a weak acid as it fully dissociates.

It is a weak acid as it partially dissociates.

Which row describes and gives the formula of hydrated copper(II) sulfate?

copper(II) sulfate chemically combined with water molecules | CuSO₄·5H₂O

aqueous copper(II) sulfate | CuSO₄·5H₂O

aqueous copper(II) sulfate | CuSO₄(aq)

copper(II) sulfate chemically combined with water molecules | CuSO₄(aq)

Which row shows the correct order of reactivity of the four named metals?

B magnesium | zinc | copper | silver

A magnesium | copper | zinc | silver

C silver | copper | zinc | magnesium

D silver | zinc | copper | magnesium

A fertiliser contains ammonium nitrate and potassium phosphate. Why is the fertiliser described as an NPK fertiliser?

It provides the three main elements needed for improved plant growth.

It provides nitrogen, which is an essential element for improved plant growth.

It contains the element oxygen, which neutralises acidic soil.

It contains the elements nitrogen and phosphorus.

What are the approximate percentages of oxygen and nitrogen in clean, dry air?

percentage of oxygen | percentage of nitrogen

Four statements about organic compounds P, Q, R and S are listed. P is a saturated hydrocarbon. The formula of Q is CH3CH3. A molecule of R contains only one oxygen atom. Compound S is a carboxylic acid. Which statement about these compounds is correct?

A. P and Q are members of different homologous series.

B. P and S are members of the same homologous series.

C. Q and S are members of the same homologous series.

D. Q, R and S are all members of different homologous series.

Which statement about the manufacture of ethene from larger alkane molecules is correct?

The process is called cracking.

The process requires an excess of oxygen.

Which processes are used to make ethanoic acid?

heating ethanol with acidified aqueous potassium manganate(VII)

distilling ethanol using a fractionating column

Which statement about propene, C3H6, is correct?

Propene undergoes addition polymerisation, forming poly(ethene).

Propene reacts with bromine in the dark in a substitution reaction.

Propene reacts with steam in the presence of an alkaline catalyst, forming an alcohol.

Propene undergoes an addition reaction to form an alkane.

Some information about solid silver chloride and solid sodium chloride is shown. - Silver chloride and sodium chloride do not dissolve in kerosene. - Silver chloride is insoluble in water, but sodium chloride is soluble in water. - The boiling point of silver chloride is 1547°C and the boiling point of sodium chloride is 1413°C. Which processes are used to separate a mixture of solid silver chloride and solid sodium chloride?

add water, stir and then filter

add kerosene, stir and then filter

add water, stir and then leave to crystallise

add water, stir and then perform fractional distillation

Which statement describes how a flame test is done?

The tip of a clean wire is dipped into the substance and the wire is placed in a blue Bunsen burner flame.

The tip of a clean wire is dipped into the substance and the wire is placed in a yellow Bunsen burner flame.

A wooden splint is lit and is placed above a test-tube containing the gas being tested.

A wooden splint is lit, blown out and the glowing splint put into a test-tube of the gas being tested.

Chemistry Multiple Choice Questions

Authored by DESHAN MAHADEVAN

Education

10th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A sample of ethanol is left in an open beaker at room temperature. After 24 hours, no ethanol remains in the beaker. What has happened to the ethanol?

It has boiled.

It has condensed.

It has evaporated.

It has frozen.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A gas is in a sealed container with a fixed volume. Which statements describe what happens to the molecules in the gas when the temperature is increased?

A 1 and 3

B 1 and 4

C 2 and 3

D 2 and 4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens when sodium atoms combine with chlorine atoms to form sodium chloride?

Sodium atoms each gain one electron, and chlorine atoms each lose one electron.

Sodium atoms each lose one electron, and chlorine atoms each gain one electron.

Sodium atoms and chlorine atoms share one electron with each other.

Sodium atoms and chlorine atoms share two electrons with each other.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which substances are ionic?

A 1, 3 and 4

B 1 and 3 only

C 2 and 4

D 2 only

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement about methane is correct?

In methane, positive hydrogen ions are attracted to negative carbon ions.

In methane, electrons are shared between carbon atoms and hydrogen atoms.

Methane has a high boiling point.

Methane is a good conductor of electricity.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A sample of iridium has a relative atomic mass of 192.29. The sample contains two isotopes only. 64.50% of the sample is 193Ir. What is the other isotope in the sample?

A 189Ir

B 190Ir

C 191Ir

D 192Ir

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ammonium iron(III) citrate contains in its formula: • more than one ammonium ion • one iron ion • two $C6H4O7^4−$ ions. What is the formula of ammonium iron(III) citrate?

(NH4)4Fe(C6H4O7)2

(NH4)5Fe(C6H4O7)2

(NH4)6Fe(C6H4O7)2

(NH4)7Fe(C6H4O7)2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many hydrogen atoms and how many carbon atoms are in one mole of ethene?

hydrogen atoms: $2.4 \times 10^{24}$ , carbon atoms: $1.2 \times 10^{24}$

hydrogen atoms: $2.4 \times 10^{24}$ , carbon atoms: $6.0 \times 10^{23}$

hydrogen atoms: 6.0 × 10^23, carbon atoms: 1.2 × 10^22

hydrogen atoms: $6.0 \times 10^{23}$ , carbon atoms: $6.0 \times 10^{23}$

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Chemistry Multiple Choice Questions

A sample of ethanol is left in an open beaker at room temperature. After 24 hours, no ethanol remains in the beaker. What has happened to the ethanol?

A gas is in a sealed container with a fixed volume. Which statements describe what happens to the molecules in the gas when the temperature is increased?

What happens when sodium atoms combine with chlorine atoms to form sodium chloride?

Which substances are ionic?

Which statement about methane is correct?

A sample of iridium has a relative atomic mass of 192.29. The sample contains two isotopes only. 64.50% of the sample is 193Ir. What is the other isotope in the sample?

Ammonium iron(III) citrate contains in its formula: • more than one ammonium ion • one iron ion • two C6H4O74−C6H4O7^4−C6H4O74− ions. What is the formula of ammonium iron(III) citrate?

Silicon(IV) oxide reacts with chlorine and carbon to form liquid silicon(IV) chloride, SiCl4, and carbon dioxide gas. If the reaction is carried out at r.t.p., which symbol equation represents this reaction?

How many hydrogen atoms and how many carbon atoms are in one mole of ethene?

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Ammonium iron(III) citrate contains in its formula: • more than one ammonium ion • one iron ion • two $C6H4O7^4−$ ions. What is the formula of ammonium iron(III) citrate?