UNIT 1 MULTIPLE CHOICE QUESTIONS
1.
An atom in which the number of protons is greater than the number of neutrons is A
234U
B
6Li
C
3He
D
2H
3
2.
3.
4.
H, an isotope of hydrogen, is !""# × 1" $24g! %ne mo&ecu&e of hydrogen, H 2, has a mass of 3!34# ' 1" $24g! (hich one of the fo&&owing is the best estimate of the mass of one neutron) The mass of one atom of tritium,
A
1!66" ' 1" $24g
B
1!66* ' 1" $24g
C
1!6*4 ' 1" $24g
D
1!6## ' 1" $24g
1
The measured re&ati+e atomic mass mass of oygen is 16! in a particu&ar samp&e! (hich one of the fo&&owing statements is not correct) A
-ach atom of oygen contains eight protons
B
The re&ati+e mo&ecu&ar mass of the samp&e is 33!"
C
There are at &east two isotopes of oygen in this samp&e!
D
m z The mass spectrum of this samp&e shows a pea. for the %/ ion at 0 16!
Assuming that ch&orine eists as two isotopes, and that h ydrogen and carbon eist as one isotope each, how many mo&ecu&ar ion pea.s wi&& be shown in the mass spectrum of 4H6&4) A
2
B
3
C
4
D
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5.
The diagram shows the mass spectrum of an e&ement which eists as mo&ecu&es 2 and contains a miture of isotopes! How many isotopes of are in this e&ement)
e &a ti+ e abundance
1 "
1
2 "
2
3 "
m /z
6.
7.
A
2
B
3
C
D
#
(hich one of the fo&&owing atoms has on&y two unpaired e&ectrons in its ground &owest energy5 state) A
he&ium
B
bery&&ium
C
nitrogen
D
oygen
(hich one of the fo&&owing ions has three &one pairs of e&ectrons around the centra& atom) A
72 $
B
8H2 $
C
&72 $
D
976 $
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2
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3
8.
9.
10.
11.
(hich one of the fo&&owing does not ha+e a pair of s e&ectrons in its highest fi&&ed e&ectron energy sub:&e+e&) A
H $
B
;g
C
93/
D
Ar
(hich atom has an incomp&ete sub:she&&) A
e
B
a
C
D
=n
(hich one of the fo&&owing ep&ains why boron has a &ower first ionisation energy than bery&&ium) A
A boron atom is sma&&er than a bery&&ium atom!
B
>n bery&&ium a&& the e&ectrons are paired in fu&& s ub:she&&s!
C
A bery&&ium atom has fewer protons than a boron atom!
D
>n boron the 2 p e&ectron occupies a higher energy &e+e& than a 2 s e&ectron!
(hich one of the fo&&owing ionisations re?uires &ess energy than the first ionisation energy of oygen) A
@g5 → @/g5 / e $
%/g5 → %2/g5 / e $
8g5 → 8/g5 / e $
7g5 → 7/g5 / e $
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12.
13.
14.
>n which one of the fo&&owing pairs is the first ionisation energy of e&ement greater than that of e&ement !) e&ectronic configuration of e&ement !
e&ectronic configuration of e&ement
A
1s1
&s2
B
1s2 2s2
&s22s2 2p1
C
1s2 2s22p3
&s22s22p4
D
1s2 2s22p6
&s22s22p6 3s1
(hich one of the fo&&owing contains the greatest number of mo&es of methano&) The A+ogadro number L5 is 6!"2 ' 1" 23, the re&ati+e mo&ecu&ar mass M r 5 of methano& is 32!5 A
6!6 ' 1"22 mo&ecu&es
B
3!3 g of methano&
C
2! ' 1" $3 m3 of methano& +apour at 3"" B and 1"" .9a
D
*"cm3 of 1! ; a?ueous methano&
(hich one of the fo&&owing compounds contains the sma&&est percentage, by mass, of oygen) A
H3%H2H3
B
H3%H2 8H2
C
%@
D
4HCA&%H52
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15.
(hen Ti>4 is reduced with hydrogen under certain conditions, a new compound is produced which contains 6#!CD ch&orine by mass! (hich one of the fo&&owing cou&d be the formu&a of the new compound)
16.
17.
18.
A
TiH2&2
B
Ti&
C
Ti&2
D
Ti13
An a&.ane contains 3" hydrogen atoms per mo&ecu&e! >ts empirica& formu&a is A
6H1
B
*H1
C
14H3"
D
1H3"
(hich one of the fo&&owing contains the sma&&est number of mo&es of carbon dioide gas) A
2!6 g
B
"!"1" m3 at 1""" B and 33!" .9a
C
1!"dm3 at 32*E and 2"" .9a
D
1"" cm3 at 3"" B and 1"" .9a
(hich one of the fo&&owing samp&es of gas, when sea&ed into a +esse& of +o&ume "!1" m 3, is at the highest pressure) A
1!6g of he&ium He5 at 1"" B
B
1!6g of methane H 45 at 1"" B
C
1!6g of oygen % 25 at 6"" B
D
1!6g of su&phur dioide @% 25 at 12"" B
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19.
20.
21.
(hat is the +o&ume occupied by 1"!# g of the freon & 272 at 1"" .9a and 2*3 B) A
2!"2 dm3
B
2!" dm3
C
2!"2 cm3
D
2!" cm3
(hich one of the fo&&owing samp&es of gas occupies the &argest +o&ume) A
1!"g of oFone % 35 at &"".9a and 3""B
B
1!"g of oygen at 1"" .9a and 3"" B
C
1!"g of water +apour at 2" .9a and 4" B
D
1!"g of methane at 333 .9a and "" B
A Gdrin.:dri+ingG offence is committed if the b&ood a&coho& &e+e& of a dri+er is o+er #" mg of ethano& per 1"" cm 3 of b&ood! (hat is the concentration in mo& dm35 of ethano& if there are #" mg of ethano& per1"" cm 3 of b&ood) A
"!""1*
B
"!"1*
C
"!"#"
D
"!#"
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22.
23.
(hen +anadium reacts with ch&orine at 4""E, a brown compound is obtained! (hen an a?ueous so&ution containing "!1C3 g of this compound was treated with a?ueous si&+er nitrate a&& the ch&orine in the compound was precipitated as si&+er ch&oride! The mass of si&+er ch&oride Ag&5 produced was "!*4 g! (hich one of the fo&&owing cou&d be the formu&a of the brown compound) A
&
B
&2
C
&3
D
&4
%n comp&ete combustion, "!"1" mo& of an organic acid produced *3 cm 3 of carbon dioide measured at 1"1 .9a and 2C#B5! The same amount of acid re?uired 1!" cm 3 of 2!"" ; sodium hydroide so&ution for neutra&isation! (hich one of the fo&&owing cou&d be the formu&a of the acid)
24.
A
H%%H
B
H3%%H
C
H%%%%H
D
H%%H2H2%%H
A brand of f&uoride tab&ets, recommended by a dentist to strengthen the ename& on teeth, contains 2!2 ' 1" $3 sodium f&uoride per tab&et! The tota& mass of f&uoride ion present in 1"" tab&ets is 1C
A
2!2 ' 1" $3 ' 42 ' 1""
B
2!2 ' 1" $3 ' 23 ' 1""
C
2!2 ' 1" $3 '
1C
C 2"
' 1""
1"" × 1C
D
2!2 × 1"
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$ 3
8
25.
@ummarised directions for recording responses to mu&tip&e comp&etion ?uestions A
B
C
D
i5, ii5 and iii5 correct on&y
i5 and iii5 correct on&y
ii5 and i+5 correct on&y
i+5 a&one correct
>onic bonding is found in
26.
27.
i5
8H4&
ii5
8aH4
iii5
H3%%B
i+5
e&2
(hich one of the fo&&owing has the most co+a&ent character) A
;g72
B
;gr 2
C
A&73
D
A&r 3
(hich one of the fo&&owing ions has the greatest po&arising power) A
& $
B
@2$
C
Li /
D
A&3/
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28.
(hich one of the fo&&owing contains bonds of different po&arities) +
29.
A
8H 4
B
&4
C
H3&
D
H3%/
(hich one of the fo&&owing is the most &i.e&y +a&ue for the bond ang&e of @74 be&ow)
shown in the diagram
α
7 7 α
@
I
7 7
30.
A
11#E
B
1"1E
C
C"E
D
##E
(hich one of the fo&&owing has a shape which is not inf&uenced by a &one pair of e&ectrons) A
H3%H
B
H27/
C
73
D
873
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31.
@ummarised directions for recording responses to mu&tip&e comp&etion ?uestions A
B
C
D
i5, ii5 and iii5 correct on&y
i5 and iii5 correct on&y
ii5 and i+5 correct on&y
i+5 a&one correct
A&& the atoms &ie in a sing&e p&ane in mo&ecu&es of
32.
i5
&3
ii5
HH%
iii5
2H2r 2
i+5
8H3
(hich one of the fo&&owing mo&ecu&es or ions is pyramida& in shape) A
73
B
H 3
C
H 3
D
@7 3
+
$
$
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33.
7or this ?uestion on" o# $o#" of the options gi+en may be correct! @e&ect your answer by means of the fo&&owing code A
if 15, 25 and 35 on&y are correct
B
if 15 and 35 on&y are correct
C
if 25 and 45 on&y are correct
D
if 45 a&one is correct irections summarised A
B
C
D
15, 25 and 35 on&y correct
15 and 35 on&y correct
25 and 45 on&y correct
45 on&y correct
The gas hydrogen cyanide, H8, is toic! >n water, hydrogen cyanide is a wea. acid with a p K a of C!4 Hydrogen cyanide gas can be disso&+ed in di&ute a?ueous sodium hydroide with which it reacts to gi+e an a?ueous so&ution containing cyanide ions! @o&utions containing cyanide ions are a&so toic but can be rendered non:toic by comp&eing the cyanide ions with iron>>5 ions! Hydrogen cyanide mo&ecu&es in the gas phase attract each other by
34.
35.
15
+an der (aa&sJ forces!
25
ionic bonds!
35
dipo&e$dipo&e forces!
45
hydrogen bonds!
(hich one of the fo&&owing is not hydrogen bonded in the &i?uid state) A
H2@%4
B
H37
C
H3 8H2
D
H7
(hich one of the fo&&owing &ists the first ionisation energies in .K mo& $15 of the e&ements ;g, A&, @i, 9 and @ in this order) A
**
*#6
1"6"
1"""
126"
B
*36
**
*#6
1"6"
1"""
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12
C
*#6
1"6"
1"""
126"
12"
D
1"6"
1"""
126"
12"
41#
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