chemistry mcqs test no 1

There are 10 Mcqs.Choose the best option.Write all of your answers in one comment (like 1A,2B,3B...)

(1)The first seven ionisation energies of an element between lithium and neon in the Periodic Table are as follows.
1310   3390    5320   7450   11 000   13 300   71 000   kJ mol–1
What is the outer electronic configuration of the element?
outer electronic configuration

(2) In which reaction does the carbon-containing product have a smaller bond angle than the organic reactant?
A bromoethane refluxed with ethanolic sodium hydroxide
B complete combustion of methane in air
C methane and an excess of chlorine under ultraviolet light \
D polymerisation of ethene

(3)Hydrogen peroxide slowly decomposes into water and oxygen. The enthalpy change of reaction can be calculated using standard enthalpies of formation.
(hydrogen peroxide(l)) = –187.8 kJ mol–1 (water(l)) = –285.8 kJ mol–1
Using a Hess cycle, what is the enthalpy change of reaction for this decomposition? 2H2O2(l) → 2H2O(l) + O2(g)
A +98 kJ mol–1
B −98 kJ mol–1
C −196 kJ mol–1
D −947.2 kJ mol–1\

(4)Which group of particles is in order of increasing size?
B N3– O2– F–
C Na+ Mg2+ Al 3+
D Na+ Ne F–

(5)Over half a million tonnes of bromine are manufactured annually and are mainly used for making other compounds. One important use is for agricultural chemicals.
What is another important use of bromine?
A antiseptic agents
B bleaches for textiles and the paper industry
C flame-retardants and fire extinguishers
D water purification

(6)In recent years, a number of athletes have been banned from sports because of their illegal use of synthetic testosterone, a naturally occurring hormone in the body.
How many chiral centres are present in a testosterone molecule?
A 1
B 2
C 3
D 6

(7)The compound known as ‘gamma-linolenic acid’ is found in significant amounts in the seeds of the Evening Primrose plant. There is evidence that the compound may help patients with diabetes.
                                 gamma-linolenic acid
How many cis-trans isomers does gamma-linolenic acid have?
A 3
B 6
C 8
D 12

(8)What always applies to a nucleophile?
A It attacks a double bond.
B It has a lone pair of electrons.
C It is a single atom.
D It is negatively charged.

(9)Trichloroethanoic acid, CCl3CO2H, is used in cosmetic surgery to perform a ‘chemical peel’ to remove dead skin.
Trichloroethanoic acid can be made by reacting chlorine with ethanoic acid. What is the mechanism of this reaction?
A electrophilic addition
B electrophilic substitution
C free radical addition
D free radical substitution

(10) Polymerisation of chloroethene gives PVC.
How does the carbon-carbon bond in PVC compare with that in chloroethene ?
A longer and stronger
B longer and weaker
C shorter and stronger
D shorter and weaker
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