Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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2730 questions · page 127 of 137 · choose a topic above to narrow them down

SA-OC-RX-0041 markL2 StandardCalculatorAgents

What is the oxidation number of sulfur in

\mathrm{SO_2}

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SA-OC-RX-0052 marksL2 StandardCalculatorAgents

What is the oxidation number of manganese in

\mathrm{KMnO_4}

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SA-OC-SA-0031 markL2 StandardCalculatorSalts and solubility

Which salt is insoluble in water?

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SA-OC-SA-0041 markL2 StandardCalculatorSalts and solubility

Which chloride is insoluble?

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SA-OC-SA-0051 markL2 StandardCalculatorPreparation methods

The best method to prepare potassium sulfate is

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SA-OC-SP-0041 markL2 StandardCalculatorSeparation methods

Ethanol and water are separated by

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SA-OC-SP-0051 markL2 StandardCalculatorApparatus

The volume of gas produced in a reaction is best measured with a

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SA-OC-ST-0041 markL2 StandardCalculatorChanges of state

During melting, the temperature of a pure solid stays constant because the energy supplied is used to

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SA-OC-TE-0041 markL2 StandardCalculatorCation tests

Adding sodium hydroxide to a solution gives a red-brown precipitate. The ion present is

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SA-OC-TE-0051 markL2 StandardCalculatorAnion tests

Acidified silver nitrate gives a yellow precipitate with

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SA-OC-TN-0031 markL2 StandardCalculatorTransition elements

Iron forms both

\mathrm{Fe^{2+}}

and

\mathrm{Fe^{3+}}

ions. This shows transition elements

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SA-OC-TN-0041 markL2 StandardCalculatorTransition elements

A solution containing

\mathrm{Cu^{2+}}

ions is

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SA-OC-WA-0031 markL2 StandardCalculatorTesting water

Which is a test for PURE water?

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SA-OC-WA-0051 markL2 StandardCalculatorWater treatment

Filtration in water treatment removes

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SA-PM-PAR-0042 marksL2 StandardNon-calculatorConverting

x=1+2\cos t

y=3+2\sin t

. Find the

y

-coordinate of the centre of this circle.

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SA-PROOF-0031 markL2 StandardCalculatorDeduction & exhaustion

Which line correctly starts a proof that the sum of any three consecutive integers is divisible by

3

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SA-PROOF-0041 markL2 StandardCalculatorDeduction & exhaustion

To prove that the sum of two odd numbers is even, the two odd numbers should be written as

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SA-PROOF-0051 markL2 StandardCalculatorDeduction & exhaustion

To prove by exhaustion that every square number leaves remainder

0

1

when divided by

3

, how many cases for

n

do you need?

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SA-PROOF-0071 markL2 StandardCalculatorClassic proofs

A proof by contradiction that

\sqrt2

is irrational begins with which assumption?

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SA-PROOF1-0012 marksL2 StandardNon-calculatorDeduction & exhaustion

For every integer

n

(n+1)^2-(n-1)^2=kn

. Find

k

, which proves the difference is always a multiple of

k

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