Reference no: EM13833459
1 A metal X that raects with metal Y in a solution of Y but does not react with Z in a solution of Z means that --------------.
Metal Y is the least reactive
Metal X is the least reactive
Metal Z is the least reactive
Metal Y and metal Z have equal reactivity
2 Oxidation can be defined as --------------.
Gain of electrons
Loss of electrons
Transfer of electrons
S haring of electrons
3 Calculate the number of mole contained in a solution of sulphuric acid, if the titre value on titration against
20cm 3
0.5 M sodium carbonate is
20.24cm 3
0.02mol
0.04mol
0.01mol
0.15mol
4 The coefficients of a balanced version of the equation of reaction involving hydrochloric acid and calcium carbonate to give the respective products are:
2,1,1,1,2
2,1,1,1,1
1,2,1,1,1
1,3,1,2,1
5 The titration of a strong acid against a weak base is suitably carried out using ------------
Any indicator
Methyl orange
Phenolphthalein
Bromothymol blue
6 The colour of methyl orange in an acid is--------------.
Yellow
Red
Blue
Pink
7 The change in colour of an indicator at the end point is due to a change in its --------------.
Composition
Amount
pH
Molarity
8 The pH of a solution is a measure of ------------- conentration of the solution.
Hydrogen ion
Water
Carbon dioxide
Metal ion
9 One of the following is NOT a type of indicator
Methyl orange
Bromocresol green
Methyl yellow
Phenolphthalein
10 The name of the reagent used to determine the end point of a titrimetric analysis is -------------.
Dye stuff
Water
Indicator
Additives
11 A substance not suitable as a primary standard probably has the following properties EXCEPT ------------.
Highly hygroscopic
Reacts with
CO 2
in air
Is volatile
Has unchanged chemical composition during storage
12 The analysis in which an un-reacted standard solution is titrated against against anoter solution is called -----------.
Precipitation titration
Back titration
Direct titration
Indirect titration
13 The titration involving potassium permanganate ,
KMnO 4
and ferrous sulphate
FeSO 4
is an example of a ----------------- titration.
Acid-base
Oxidation-reduction
Precipitation
Complexometric
14 The titrimetric analysis involving the titration of EDTA, an organic ligand with a calcium solution cxould be classified as ------------- titration.
Acid -base
Redox
Precipitation
Complexometric
15 Redox reactions are -----------------.
Reactions between an acid and a base
Reactions which have resulted in changes in the oxidation states of two reactants.
Reactions that are colourful because the reactants must be coloured
Reactions which are naturally occuring.
16 What is the oxidation state of iodine in iodate ion?
+5
+6
+7
+8
17 In a standard volumetric analysis performed in a laboratory class involving potassium permanganate (158) and sodium oxalate (84)solution, the following titre values were obtained : 25.90; 26.50; 26.60 respectively. Determine the volume of the titrant.
26.50
26.20
26.25
26.55
18 In a standard volumetric analysis performed in a laboratory class involving potassium permanganate (158) and sodium oxalate (84)solution, the following titre values were obtained : 25.90; 26.50; 26.60 respectively. What is the unit of the volume measureme
Cubic centimetre
Cubic decimetre
Cubic metre
Cubic decilitre
19 In a typical expeiment in a laboratory, 4.50g of sulphuric acid in
250cm 3
of water was titrated with an impure solution of 5.24g of sodium hydroxide contained in
1dm 3
. If the titre values of the experiment were
20.50
22.45
, $22.6
0.05mol
0.0013mol
0.058mol
0.131mol
20 In a typical expeiment in a laboratory, 4.50g of sulphuric acid in
250cm 3
of water was titrated with an impure solution of 5.24g of sodium hydroxide contained in
1dm 3
. If the titre values of the experiment were
20.50
22.45
, $22.6
0.042mol/dm 3
0.032mol/dm 3
0.027mol/dm 3
0.058mol/dm 3