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JAMB questions for "Chemistry :: Acids,bases and salts"
Q1

The colour of methyl orange in alkaline medium is

A

orange

B

red

C

yellow

D

pink

E
Q2

Which of the following salts is slightly soluble in water?

A

Na2CO3

B

PbCl2

C

AgCl

D

CaSO4

E
Q3

6AgNO3(aq) + PH3(g) + 3H2O(I) → 6Ag(s) +H3PO3(aq) + 6HNO3(aq)

In the reaction above, the reducing agent is

A

PH3(g)

B

AgNO3(aq)

C

HNO3(aq)

D

H2O(l)

E
Q4
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
A
5.4g
B
14.2g
C
0.2g
D
1.8g
E
Q5

The salt formed from a reaction between citric acid and sodium hydroxide in solution will be

A

acidic

B

basic

C

complex

D

neutral

E
Q6

The colour change observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is

A

yellow to purple

B

orange to green

C

green to orange

D

purple to yellow

E
Q7

The oxidation state of Cr in K2CrO7 is 

A

+7

B

+6

C

+5

D

+4

E
Q8

Lucas reagent is used to test for 

A

alkanes

B

alkanoic acids

C

alkanols

D

amines

E
Q9

What is the pH of a 0.001 mol dm-3 solution of sodium hydroxide?

A

14

B

13

C

12

D

11

E
Q10

The basicity of CH3COOH is 

A

1

B

2

C

3

D

4

E
Q11

0.05 mol dm-3 HCl is neutralized by 25cm3 NaOH. If the volume of acid used is 32.00 cm3, what is the concentration of the base?

A

0.016 mol dm-3

B

0.032 mol dm-3

C

0.039 mol dm-3

D

0.064 mol dm-3

E
Q12

What weight of NaCl is needed to make 2.0dm3 of a 1.5M solution?

 

[Na =23, Cl = 35.5]

A

58g

B

87g

C

116g

D

175g

E
Q13

Tartaric acid is used industrially to 

A

dry substances 

B

make baking powder

C

make fruit juice

D

remove dust

E
Q14

Calculate the number of moles of HCl present in 20 cm3 of a 0.75M solution of the acid.

A

3.800 moles

B

1.500 moles

C

0.038 mole

D

0.015 mole

E
Q15

The salt formed from a strong acid and a strong base is

A

acidic

B

basic

C

complex

D

neutral

E
Q16
Which of the following equimolar solutions will have the highest pH?
A
NH4OH
B
CH3COONa
C
HCl
D
NaOH
E
Q17
Which of the following ions requires the largest quantity of electricity for discharge at an electrode?
A
2.5 moles of Cu2+
B
4.0 moles of Cl-
C
2.0 moles of Al3+
D
3.0 moles of Na+
E
Q18
Which of these compounds is a normal salt?
A
Na2CO3
B
NaHCO3
C
NaHSO4
D
NaHS
E
Q19
CH3COOH(g) → CH4(g) + CO2(g)   The above reaction is
A
acidification
B
esterification
C
decarboxylation
D
carboxylation
E
Q20
Ethene reacts with hydrogen bromide to give
A
CHBr3
B
CH2Br
C
CH3CH2Br
D
C2H2Br2
E
Q21
Which of the following ions is acidic?
A
S2-
B
H3O+
C
NO3-
D
K+
E
Q22
3Cu + ρHNO3 → 3Cu(NO3)2 + 4H2O + xNO.    In the equation above, the values of ρ and x respectively are
A
8 and 2
B
6 and 2
C
2 and 3
D
1 and 3
E
Q23
Three drops of a 1.0 mol dm-3 solution of NaOH are  added to 20cm3 of a solution of pH 8.4. The pH added to the resulting solution will be
A
close to that of pure water
B
unaltered
C
greater than 8.4
D
less than 8.4
E
Q24
25cm3 of a 0.2 mol dm-3 solution of Na2CO3 requires 20cm3 of a solution of HCl for neutralization. The concentration of the HCl solution is
A
0.5 mol dm-3
B
0.6 mol dm-3
C
0.2 mol dm-3
D
0.4 mol dm-3
E
Q25
The formula CH2O for ethanoic acid is regarded as its 
A
molecular formula
B
general formula
C
empirical formular
D
structural formula
E
Q26
NH3(s) + HCl(g) → NH4Cl(s)   The entropy change in the system above is
A
zero
B
intermediate
C
positive
D
negative
E
Q27
In which order are the following salts sensitive to light?
A
Agl > AgCl > AgBr
B
AgCl > AgI > AgBr
C
AgBr > AgCl > AgI
D
AgCl > AgBr > AgI
E
Q28
The pH of a solution obtained by mixing 100 cm3 of a 0.1 M HCl solution with 100 cm3 of a 0.2 M solution of NaOH is
A
1.3
B
7.0
C
9.7
D
12.7
E
Q29
The soil around a battery manufacturing factory is likely to contain a high concentration of
A
Ca2+ salts
B
Pb2+ salts
C
Mg2+ salts
D
Al3+ salts
E
Q30
25 cm3 of 0.02 M KOH neutralized 0.03 of a monobasic organic acid having the general formular CnH2n+1 COOH. The molecular formula of the acid is    [C = 12, H = 1, O = 16]
A
HCOOH
B
C2H5COOH
C
CH3COOH
D
C3H7COOH
E
Q31
On recrystallization, 20g of magnesium tetraoxosulphate (IV) forms 41g of magnesium tetraoxosulphate (IV) crystals, MgSO4.yH2O. The value of y is   [Mg = 24, S = 32, O = 16, H = 1]
A
1
B
3
C
5
D
7
E
Q32
The hydroxyl ion concentration, [OH] in a solution of sodium hydroxide of pH 10.0 is
A
10-10 mol dm-3
B
10-6 mol dm-3
C
10-4 mol dm-3
D
10-2 mol dm-3
E
Q33
Which of the aqueous solutions with pH values below will liberate hydrogen when it reacts with magnesium metal?
A
13.0
B
7.0
C
6.5
D
3.0
E
Q34
The number of hydrogen ions in 4.9 g of tetraoxosulphate  (VI) acid is   [S = 32, O = 16, H = 1, NA = 6.02 x 1023]
A
3.01 x 1022
B
6.02 x 1022
C
3.01 x 1023
D
6.02 x 1023
E
Q35
Which of the following solutions will have a pH < 7?
A
Na2SO4(aq)
B
NaCl(aq)
C
NaCO3(aq)
D
NH4Cl(aq)
E
Q36
What is the pH of a 2.50 x 10-5 M solution of sodium hydroxide
A
3.6
B
5.0
C
9.4
D
12.0
E
Q37
The graph beside show the pH changes for the titration of a
A
strong acid versus strong base
B
weak acid versus strong base
C
strong acid versus weak base
D
weak acid versus weak base
E
Q38
CH3COOH + CH3CH2OH &#8594; X + Y. X and Y in the reaction above are respectively.
A
CH3COCH3 and H2O
B
CH3CH2COCH3 and H2O2
C
CH3COOCH2CH3 and H2O
D
CH3CH2CHO and CH4
E
Q39
A few drops of concentrated PCI are added to about 10cm3 of a solution of pH 3.4. The pH of the resulting mixture is
A
less than 3.4
B
greater than 3.4
C
unaltered
D
the same as that of pure water
E
Q40
Which of the following compounds is a base?
A
CO2
B
CaO
C
H3PO3
D
CH3COOCH3
E
Q41
20 cm3 of a 2.0 M solution of ethanoic acid was added to excess of 0.05M sodium hydroxide. The mass of the salt produced is   [Na = 23, C = 12, O = 16, H = 1]
A
2.50 g
B
2.73 g
C
3.28 g
D
4.54 g
E
Q42
An anhydride is an oxide of a non-metal
A
which will not dissolve in water
B
whose solution in water has a pH greater than 7
C
whose solution in water has a pH less than 17
D
wose solution in water has a pH of 7
E
Q43
A student prepared 0.5M solution each of hydrochloric and ethanoic acids and then measured their pH. The result would show that the
A
pH values are equals
B
HCl solution has a higher pH
C
sum of the pH values is 14
D
ethanoic acid solution has a higher pH
E
Q44
NH3 + H3O+ &#8594; NH4+ H2O. t may be deduced from the reaction above that
A
a redox reaction has occured
B
H3O+ acts as an oxidizing agent
C
H3O+ acts as an acid
D
water acts as an acid
E
Q45
Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating
A
Silver trioxonitrate (V)
B
Sodium trioxonitrate (V)
C
Calcium trioxonitrate (V)
D
LIthium trioxonitrate (V)
E
Q46
wH2SO4 + xAl(OH)3 &#8594; yH2O + zAl2(SO4)3. The respective values of w,x,y and z in the equation above are
A
2, 2, 5 and 1
B
3, 2, 5 and 2
C
3, 2, 6 and 1
D
2, 2, 6 and 2
E
Q47
A sample of orange juice is found to have a pH of 3.80. What is the concentration of the hydroxide ion in the juice?
A
1.6 x 10-4
B
6.3 x 10-11
C
6.3 x 10-4
D
1.6 x 10-11
E
Q48
Arrange HCI, CH3COOH, C6H5CH3 in order of increasing conductivity
A
HCI, CH3COOH, C6H5CH3
B
C6H5CH3, HCI, CH3COOH
C
C6H5CH3, CH3COOHHCI
D
CH3COOH, C6H5CH3HCI
E
Q49
Which of these is an acid salt?
A
K2SO4.AI3(SO4).24H2O
B
CuCO3.Cu3.Cu(OH)2
C
NaHS
D
CaOCI2
E
Q50
Which of the following equimolar solutins.   Na2CO3Na2SO4, FeCl3, NH4Cl and CH3COONa have pH greater than 7?
A
FeCl3 and NH4Cl
B
Na2CO3, CH3COONa and Na2SO4
C
Na2CO3 and CH3COONa
D
FeCl3, CH3COON and NH4Cl
E
Q51
Which of the following are the products of the action between CH3COOH and Cl2 in sunlight?
A
CICH2COOH + HCI
B
CH3COCI + HOCI
C
CH3COOCI + HCI
D
CH3COCI + H2O
E
Q52
2.0 g of a monobasic acid was made up to 250 cm3 with distilled water. 25.00 cm3 of 0.1M NaOH solution required 20.00cm3 of 0.1M NaOH solution for complete neutralizatin. The molar mass of the acid is
A
200 g
B
160 g
C
100 g
D
50 g
E
Q53
What is the concentration of H+ ions in moles per dm3 of a solution of pH 4.398?
A
4.0 x 10-5
B
0.4 x 10-5
C
4.0 x 10-3
D
0.4 x 10-3
E
Q54
What volume of 11.0 M hydrochloric acid must be diluted to obtain 1 dm3 of 0.05M acid?
A
0.05 dm3
B
0.10 dm3
C
0.55 dm3
D
11.0 dm3
E
Q55
Using 50 cm3 of 1 M potassium hydroxide and 100cm3 of 1M tetraoxosulphate (VI) acid, calculate the respective volumes in cm3 of base and acid that would be required to produce the maximum amount of potassium tetraoxosulpate (VI)   [K = 39, S = 32, O = 16, H = 1]
A
50, 50
B
25, 50
C
50, 25
D
25, 25
E
Q56
An acid and its cojugate base 
A
can neutralise each other to form a salt
B
difer only be a proton
C
difer only by the opposite charges they carry
D
are always neutral substance
E
Q57
Which of the following dilute solution has the lowest pH value?
A
Calcium trioxocarbonate (IV)
B
Sodium trioxocarbonate (IV)
C
Hydrochloric acid
D
Ethanoic acid
E
Q58
Which of the following substances is a basic salt?
A
Na2CO3
B
Mg(OH)Cl
C
NaHCO3
D
K2SO4Al2(SO4)324H2O
E
Q59
A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (VI) acid and then K2CrO7 solutions a blue-black colour was produced. In this reaction, the
A
iodide ion is oxidized 
B
tetraoxosulphate (VI0 acid acts as oxidizing agent
C
starch has been oxidized
D
K2Cr2O7 is oxidized
E
Q60
Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was
A
nitrogen
B
chlorine
C
oxygen
D
sulphur (IV) oxide
E