Font size
WorksheetsChemistry SK025
Total questions: 40
Worksheet time: 40mins
If a reaction is described as zero order with respect to reactant A, this means that
A is a catalyst in the reaction.
A is not involved in the rate determining step.
the value of the rate constant is independent of A.
the rate of reaction is inversely proportional to the concentration of A.
The reaction A + 2B → products was found to have the rate law, rate = k[A] [B]2. Predict by what factor the rate of reaction will increase when the concentration of B is doubled and the concentration of A remained unchanged.
2
6
4
8
The reaction : Q → products is believed to be of first order.
Which of the following graph(s) is/are correct?
Which of the following processes is endothermic?
H2O(s) → H2O(l)
O2(g) + 2H2(g) → 2H2O(g)
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
3O2(g) + 2CH3OH(g) → 2CO2(g) + 4H2O(g)
A __________ ΔH corresponds to an __________ process.
negative, endothermic
negative, exothermic
zero, endothermic
zero, exothermic
Hess’s law states that the
enthalpy change at 25°C and 1 atm is the same for all reactions.
standard enthalpy change of a reaction is the heat change of a reaction at 25°C and 1 atm.
enthalpy change of a reaction is the same whether the reaction takes place in one step or in a series of steps.
standard enthalpy changes of all reactions are the same whether the reaction has only one step or many steps.
Consider the above half-cells, Which of the following combinations give the highest e.m.f?
I and II
II and III
II and IV
I and IV
Consider the following half-cells:
Fe3+ + e- → Fe2+ E° = +0.74 V
I2 + 2e- → 2I- E° = +0.55 V
Sn4++ 2e- → Sn2+ E° = +0.15 V
Ce3+ + 3e- → Ce E° = -2.33 V
It can be concluded that iodine will
reduce Fe3+ to Fe2+
reduce Sn4+ to Sn2+
reduce Ce3+ to Ce
oxidise Ce to Ce3+
Which statement is incorrect about an electrolytic cell?
The cell reaction is spontaneous.
Reduction occurs at the cathode.
The electrodes may be inert (e.g. graphite) or may be involved in the cell reaction.
The cell includes a battery.
Process in which substance gains electrons is called
oxidation
hydrogenation
sublimation
reduction
Galvanic cells convert
mechanical energy in to electrical energy
potential energy in to electrical energy
kinetic energy in to electrical energy
chemical energy in to electrical energy
The two types of stereoisomers are
diastereomers and enantiomers
enantiomers and positional isomers
chain isomers and positional isomers.
diastereomers and functional group isomers.
Vinyl acetate is used to make poly(vinyl acetate), PVA, plastic. The structure of vinyl acetate is shown.
Based on the given structural formula, vinyl acetate
is a cis isomer.
is a trans isomer.
exhibits structural isomers.
contains a chiral carbon atom.
The functional groups present in the amino acid with the structural formula as shown are
alkoxy, carboxy, amide and aromatic ring.
alkoxy, carboxyl, amino and aromatic ring.
hydroxyl, carboxyl , amino and aromatic ring.
hydroxyl, carbonyl, amino and aromatic ring.
Which of the following free radical is the most stable?
Which of the following alkane has the lowest boiling point?
C5H10
(CH3)4C
(CH3)2CHC2H5
CH3CH2CH2CH2CH3
Choose the true statement about an alkane.
It undergoes electrophilic addition with chlorine gas.
It undergoes nucleophilic substitution with chlorine gas.
It undergoes homolytic cleavage when reacts with chlorine gas.
It undergoes electrophilic substitution with an aqueous chlorine solution.
Which of the following reaction is a free radical substitution?
Hydrolysis of alkanes
Combustion of alkanes
Halogenation of alkanes
Hydrogenation of alkanes
Ozonolysis of an alkene produces ethanal, CH3CHO, and propanal, CH3CH2CHO. The alkene is
1-pentene
2-pentene
3-pentene
2-methyl-2-butene
Which compound(s) show(s) cis-trans isomerism?
CH3 – CH2 – CH = CH2
ClCH2CH = CHCH2Cl
Which alkene produces ethanoic acid and butanone when reacted with hot acidified KMnO4 solution?
CH3CH=CHCH3
CH3CH=C(CH3)2
CH3CH=CHCH2CH3
CH3CH=C(CH3)CH2CH3
Propene reacts with hydrogen halide, HX, according to the above equation
Which of the following statement is/are correct?
The intermediate is a carbocation.
The product formed follows Markovnikoff’s rule.
The rate of reaction increases in order: HCl < HBr < HI
Choose the correct statement for the reaction .
It is an addition reaction.
The electrophile is H2SO4.
It is an electrophilic substitution.
HNO3 donates a pair of electrons.
What is the function of Lewis acid in halogenation of benzene?
It produces a nucleophile.
It produces an electrophile.
It initiates the formation of halogen radical.
It decreases the polarity of halogen molecule.
Haloalkanes are more reactive than corresponding alkanes because
haloalkanes are ionic compounds.
haloalkanes are polar compounds.
haloalkanes are more soluble in water.
the size of the halogen atoms are bigger.
Grignard reagents, RMgX are organometallic compounds. Which statement is true about organometallic compounds?
It acts as a nucleophile.
It is a non-polar compound
It undergoes substitution reaction.
Its carbon atom has a positive charge.
The reaction below is classified as
(CH3)3COH + HBr → (CH3)3CBr + H2O
oxidation
reduction
substitution
condensation
Which of the following statement is NOT true about an alcohol?
Methanol is the simplest alcohol.
Alcohol is more polar than haloalkane.
Ethanol can be prepared by fermentation.
Solubility of alcohol in water increases with number of carbon atoms.
Butanal can be distinguished from butanone by using the following reagents EXCEPT
Schiff’s reagent
Tollens’ reagent
Iodoform test
Bromine water
Which of the following would attack the carbon atom in the carbonyl group?
Nucleophile
Electrophile
Free radical
Carbocation
Which of the following acids is the most soluble in water?
Benzoic acid
Butanoic acid
Heptanoic acid
1,4-benzenedicarboxylic acid
Which of the following is the best reagent(s) for the conversion?
H2, Pt
KMnO4, H+
LiAlH4 followed by acidification
NaBH4 in methanol
Which of the following is an ester?
CH3COCH2OH
CH3COCOCH3
HCO2CH(OH)CH3
HOCH2CH2COOH
When aqueous bromine is added to phenylamine, the brown colour of bromine is decolourised. Which of the following statement explains this observation?
The NH2 group is oxidized to NO2.
Bromine reacts with phenylamine to form a colourless complex.
One of the hydrogen atoms in the NH2 group is replaced by bromine atom.
three of hydrogen atoms in the benzene ring is replaced by bromine atoms.
Classify the following amine
CH3CH2NHCH3
primary
secondary
tertiary
quaternary
Compound X gives a clear solution when react with benzene sulphonyl chloride in excess KOH but a precipitate form upon acidification. X could be
(CH3)3N
C3H7NH2
CH3NHC2H5
(CH3)2NH
The general structural formula of an amino acid is
A protein is
a polysaccharide
a polymer of amino acids.
a saturated ester of glycerol.
one of the units composing a nucleic acid.
Copolymer is best described as
an addition polymer
a naturally occurring polymer
polymer that softens upon heating and can be remould
a polymer consisting of more than one type of monomer
When nylon-6,6 is produced from a dicarboxylic acid and a diamine,
ammonia gas is liberated
ester linkages are formed
condensation polymerisation occurs
addition polymerisation occurs
