NEW
Font size
WorksheetsSTOGS Y12 Acids & redox
Total questions: 20
Worksheet time: 32mins
The oxidation state of selenium in NaSeO₃ is
+5
+3
+7
-5
In the reaction N₂(g) + 3 H₂(g) --> 2 NH₃(g), nitrogen is __________.
reduced
oxidized
electrolyzed
synthesized
The species that loses electron is _____ and usually _____ agent.
oxidized;reducing
reduced;oxidizing
oxidized;oxidizing
reduced;reducing
What is the oxidation number of chlorine in HClO?
0
-1
+1
+5
Determine the oxidation number of chromate in CrO42-.
+6
0
+2
+3
Which of the following represents oxidation?
C → CH4
Fe3+ → Fe2+
Cl2 → 2Cl-
Zn → ZnO
Which equation represents a redox reaction?
NaOH + HNO3 → NaNO3 +H2O
2AgNO3 + Zn → Zn(NO3)2 + 2Ag
2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3
CaCO3 + 2HCl → CaCl2 + H2O + CO2
The following chemical equation represents the extraction of silicon from quartz using coke.
SiO2 + C → Si + CO2
What is the change in oxidation number of silicon?
+2 to 0
+4 to 0
0 to +2
0 to +4
To prepare a solution of accurately known volume, use a
measuring cylinder
beaker
concial flask
volumetric flask
To deliver a fixed accurate volume of a solution, use a
pipette
burette
dropper
beaker
What is the reading on this burette?
24.2 cm3
24.0 cm3
25.8 cm3
23.9 cm3
The following diagram shows the initial and final burette readings.
What was the volume of sodium hydroxide solution used?
28.20 cm3
28.80 cm3
29.20 cm3
29.80 cm3
What is the average titre needed for neutralisation?
25.2cm3
59.7cm3
25.0cm3
25.4cm3
30cm3 of NaOH is neutralised by 12.3cm3 of 0.2moldm-3HCl. What is the concentration of the NaOH.
82 mol dm-3
0.82 mol dm-3
0.49 mol dm-3
0.082 mol dm-3
Which pieces of glassware should be used when preparing a primary standard solution?
pipette, burette, and conical flask
dropper, watch glass, and pipette
beaker, filter funnel, and volumetric flask
measuring cylinder, stirring rod, and conical flask
In a titration of a strong base with a strong acid, the following procedure was used:
1. A burette was rinsed with water and then filled with the standard acid.
2. A pipette was rinsed with some base solution.
3. A conical flask was rinsed with some base solution.
4. A pipette was used to transfer a measured volume of base solution into the conical flask.
5. Indicator was added to the base sample and it was titrated to the endpoint with the acid.
Which statement is correct?
the calculated base concentration will be correct
the calculated base concentration will be too low
the calculated base concentration will be too high
no definite conclusion can be reached about the base concentration
Which of the following statements best defines water of crystallization?
The arrangement of water molecules around an ion.
The amount of increase in size of a crystal when added to water.
Molecules of water that are present in the lattice of a crystal.
The minimum amount of water needed to completely dissolve a crystal.
