Practise

Question bank

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

TopicSkillDifficulty

2645 questions · page 43 of 133 · choose a topic above to narrow them down

SA-AC-MO-0012 marksL1 FoundationCalculatorThe mole

Calculate the number of molecules in

0.25

mol of water. Enter the number.

Salam Academy Original Practice · Proposed mark scheme

SA-AC-NM-0011 markL1 FoundationCalculator¹³C NMR

How many peaks are in the ¹³C NMR spectrum of propanone,

\mathrm{CH_3COCH_3}

Salam Academy Original Practice · Proposed mark scheme

SA-AC-NS-0011 markL1 FoundationCalculatorNitrogen compounds

Nitrogen gas is unreactive mainly because

Salam Academy Original Practice · Proposed mark scheme

SA-AC-OB-0011 markL1 FoundationCalculatorNaming

The IUPAC name of

\mathrm{CH_3CH(CH_3)CH_3}

Salam Academy Original Practice · Proposed mark scheme

SA-AC-OB-0021 markL1 FoundationCalculatorMechanisms

A nucleophile is

Salam Academy Original Practice · Proposed mark scheme

SA-AC-OP-0011 markL1 FoundationCalculatorChiral centres

A chiral carbon has

Salam Academy Original Practice · Proposed mark scheme

SA-AC-PD-0011 markL1 FoundationCalculatorAmino acids

A zwitterion has

Salam Academy Original Practice · Proposed mark scheme

SA-AC-PE-0011 markL1 FoundationCalculatorPhysical trends

Across period 3, atomic radius

Salam Academy Original Practice · Proposed mark scheme

SA-AC-PH-0011 markL1 FoundationCalculatorStrong acids and bases

Calculate the pH of 0.0100 mol dm⁻³ HCl.

Salam Academy Original Practice · Proposed mark scheme

SA-AC-PL-0011 markL1 FoundationCalculatorPlanning

The variable you deliberately change is the

Salam Academy Original Practice · Proposed mark scheme

SA-AC-PR-0021 markL1 FoundationCalculatorTitration

Concordant titres are within

Salam Academy Original Practice · Proposed mark scheme

SA-AC-RD-0011 markL1 FoundationCalculatorOxidation numbers

What is the oxidation number of Cr in

\mathrm{Cr_2O_7^{2-}}

Salam Academy Original Practice · Proposed mark scheme

SA-AC-RE-0011 markL1 FoundationCalculatorOrders

Doubling [A] quadruples the rate. The order with respect to A is

Salam Academy Original Practice · Proposed mark scheme

SA-AC-SH-0011 markL1 FoundationCalculatorVSEPR

The shape of methane,

\mathrm{CH_4}

, is

Salam Academy Original Practice · Proposed mark scheme

SA-AC-SH-0021 markL1 FoundationCalculatorVSEPR

What is the H–N–H bond angle in ammonia, in degrees?

Salam Academy Original Practice · Proposed mark scheme

SA-AC-SY-0011 markL1 FoundationCalculatorReaction map

Which reagent converts a halogenoalkane into an alcohol?

Salam Academy Original Practice · Proposed mark scheme

SA-DM-AL-0021 markL1 FoundationNon-calculatorSorting

What is the maximum number of comparisons a bubble sort can need for

6

items?

Salam Academy Original Practice · Proposed mark scheme

SA-DM-AL-G012 marksL1 FoundationNon-calculatorBin packing

Items of size

8,7,5,4,3,3

are packed into bins of size

10

. Find the lower bound for the number of bins.

Salam Academy Original Practice · Proposed mark scheme

SA-DM-AS-0021 markL1 FoundationNon-calculatorVariants

Three workers are to be assigned to four jobs. How many dummy workers (rows) are needed?

Salam Academy Original Practice · Proposed mark scheme

SA-DM-AS-G011 markL1 FoundationNon-calculatorHungarian

Row

P

of a cost matrix is

4,2,8

. After row reduction, what is the entry in column 3?

Salam Academy Original Practice · Proposed mark scheme