MULTIPLE CHOICE QUESTIONS Flashcards
Which substance has delocalised electrons?
[1 mark]
A graphite
B iodine
C sodium chloride
D tetrachloromethane
A
Which change occurs when water is vaporised?
[1 mark]
A An exothermic change occurs.
B Covalent bonds are broken.
C Intermolecular forces are overcome.
D The total energy of the molecules decreases
C
Which property would you expect the element radium, Ra, to possess? (last 1 in group2)
[1 mark]
A It forms a soluble sulfate.
B It does not react with water.
C It is a good conductor of electricity.
D It forms a covalent fluoride.
C
What is the best oxidising agent?
[1 mark]
A F2
B F–
C I2
D I
–
A
Which molecule does not have a permanent dipole?
A CH3Br
B CH2Br2
C CHBr3
D CBr4
D
Which compound has the fastest rate of reaction with potassium cyanide to form pentanenitrile?
A 1-bromobutane
B 1-chlorobutane
C 1-fluorobutane
D 1-iodobutane
D
Which alcohol can be oxidised by acidified potassium dichromate(VI) but cannot be dehydrated by heating with concentrated sulfuric acid?
A 2,3-dimethylbutan-2-ol
B 2,2-dimethylpropan-1-ol
C 2-methylpropan-2-ol
D pentan-3-ol
B
which equation is a propagation step in the conversion of trichloromethane into tetrachloromethane by reaction with chlorine in the presence of ultraviolet light?
A CHCl3 + Cl2 ⟶ CCl4 + HCl
B ●CCl3 + ●Cl ⟶ CCl4
C CHCl3 + ●Cl ⟶ CCl4 + ●H
D ●CCl3 + Cl2 ⟶ CCl4 + ●Cl
D
Which statement is correct about poly(chloroethene)?
A It has the empirical formula CHCl
B It decolourises bromine water.
C Its brittleness is reduced by plasticisers.
D Its polymer chain contains alternate single and double bonds.
C
Which statement is correct about the fractional distillation of crude oil?
A A zeolite catalyst is used.
B Each fraction contains a mixture of hydrocarbons.
C Gaseous fractions are formed by breaking covalent bonds.
D The fractionating column is hottest at the top.
B
Which of these Period 3 elements has the highest melting point?
A Aluminium
B Phosphorus
C Sodium
D Sulfur
A
Which compound is a structural isomer of Z-but-2-ene?
A butane
B E-but-2-ene
C cyclobutane
D methylbut-2-ene
C
Which can be both an empirical and molecular formula of a stable compound?
Select one:
a.
CH3
b.
CH2O
c.
P4O10
d.
NH2
empirical =simpsles ratio
stable = all have their maximum bonds formatuion
b
5.Chlorine has two isotopes, 35Cl and 37Cl. The number of molecular ion peaks in the mass spectrum of a sample
is
A 2
B 3
C 4
D 5
B
.Which change requires the largest amount of energy?
A He+(g) He2+(g) + e–
B Li(g) Li+(g) + e–
C Mg+(g) Mg2+(g) + e–
D N(g) N+(g) + e–
A (bcz removing e- from 1s subshell closest to nucleus lowest energy level hardest to remove)
(2nd IE is bigger than 1st always )
