DF Kerboodle Test (MCQ's)

Question 1

A molecule has the structure (CH₃)₂CO.

The number of σ- and π-bonds in this molecule are:

Answer 1

• D

Question 2

In an endothermic reaction:

• more bonds broken than are made
• the products have less enthalpy than the reactants
• the enthalpy change of bond breaking is larger than that of bond making
• ΔH is negative

Answer 2

• the enthalpy change of bond breaking is larger than that of bond making

Question 3

Cycloalkanes:

• are aromatic
• are isomers or alkanes
• have the general formula C_nH_2n
• are unsaturated

Answer 3

• have the general formula C_nH_2n

Question 4

A compound that can be made in one step from pent-1-ene is:

• 1,2-dibromopent-1-ene
• 2-bromopentane
• pentan-3-ol
• 2,3-dibromopentane

Answer 4

• 2-bromopentane

Question 5

A student mixes 25 cm³ of 1.0 mol dm^–3 HCl and 25 cm³ of 1.0 mol dm^–3 NaOH. The temperature increases by 7.0 °C.

The student then mixes 50 cm³ of the same two solutions. What is the temperature increase?

• 3.5 °C
• 7.0 °C
• 14.0 °C
• 28.0 °C

Answer 5

• 7.0 °C

Question 6

A student heats 0.010 mol of KNO₃ at room temperature and pressure.

2KNO₃ –> 2KNO₂ + O₂

What volume of O₂ is evolved?

• 120 cm³
• 240 cm³
• 12 dm³
• 24 dm³

Answer 6

• 120 cm³

Question 7

The volume of an ideal gas is halved and its Kelvin temperature is doubled. What is the pressure multiplied by?

• 0.25
• 1
• 2
• 4

Answer 7

• 4

Question 8

50 cm³ of ammonia is mixed with 20 cm³ of hydrogen chloride.

NH_3(g) + HCl_(g) –> NH₄Cl_(s)

What is the final volume of gas when the reaction is complete?

• 30 cm³
• 35 cm³​
• 50 cm³​
• 70 cm³​

Answer 8

• 30 cm³

Question 9

A compound has the formula CH₃CH(CH₃)CH(OH)CH₃.

What is the name of the compound?

• pentan-2-ol
• 2-hydroxy-3-methylbutane
• 3-methylbutan-2-ol
• 2-hydroxypentane

Answer 9

• 3-methylbutan-2-ol

Question 10

An electrophile is:

• a molecule with a positive charge
• attracted to a negatively charged region
• capable of donating electrons to form a bond
• capable of reacting with a carbocation

Answer 10

• attracted to a negatively charged region