Chemistry Test Paper 10

Which one of the following substances is a deliquescent substance?
1. Calcium chloride
2. Sodium carbonate
3. Cobalt (II)chloride
4. Iron (II) sulphate.
Permanent hard water can he softened by
1. boiling the water
2. adding calcium hydroxide
3. adding aqueous ammonia
4. adding sodium carbonate.
Which one of the following salts can he prepared by synthesis?
1. Sodium chloride
2. Sodium sulphate
3. Sodium carbonate
4. Sodium nitrate.
The solubility of copper (II) sulphate at 30 C is 25g per l00g of water. The mass of Copper (II) sulphate that would crystallize if a solution containing 50g of copper (II) sulphate in 100g of water at 60°C is cooled to 30°C is
1. 12. 5g
2. 25.0g
3. 50. g
4. 75. 0g
Carbon dioxide is produced from sodium hydrogen carbonate according to the following equation:
1. .
2. .
3. .
4. .
1. 8.25g
2. 16.50g
3. 33. 00g
4. 66.00g
The process by which the property of rubber is improved by heating it with sulphur is called
1. polymerization
2. vulcanisation
3. catalysis
4. dehydration.
25.0cm3 of a 0.4M NaOH solution was diluted to 250cm3 with dilute water. The molarity of the resultant solution is
1. 0.01
2. 0.04
3. 0.02
4. 04
The catalyst used in the manufacture of nitric acid is
1. iron
2. platinum .
3. iron (III) oxide
4. vanadium (V) oxide
During the electrolysis of dilute sodium chloride the carbon anode decreases in size because carbon reacts with
1. Chlorine
2. oxygen
3. sodium
4. sodium hydroxide
Calculate the relative molecular mass of gas P if 8.4 dm3 of the gas has a mass of 0.93g. (1 mole of gas occupies 22.4 at s.t.p)
1. .
2. .
3. .
4. .
Which one of" the following salts when in solution will form a white precipitate with acidified barium nitrate solution?
1. .
2. .
3. .
4. .
Calcium carbonate reacts with hydrochloric acid according to the following equation:
CaCO3(s) + 2HCl(aq) CaCl2 (aq)+ CO2(g)+ H2O (l)
The mass of CaCO3 that will react completely with 50c.c of 2M hydrochloric
acid is(CaCO3 = 100)
Most metals react with dilute mineral acids to form
1. hydrogen gas only
2. the salt of the metal and water
3. the salt of the meta! only.
4. the salt of the metal and hydrogen gas.
Which one of the following gases can be collected over water?
1. Hydrogen chloride
2. carbondioxide
3. Ammonia
4. Sulphur dioxide
Hydrogen reacts with oxygen according to the equation :
2H2(g) + O2(g)  2H2O(g)
The volume of oxygen that is required to react with hydrogen to form 40crn
of steam is
1. 20cm3
2. 40cm3
3. 80cm3
4. 120cm3
Which one of the following has the greatest number of atoms?
(Cl = 35.5, O = 16, N = 14, H = 1)
1. 1.0 g chlorine
2. 1.0 g oxygen
3. 1.0 g nitrogen
4. 1 .0 g hydrogen
Hydrogen sulphide is formed by reacting dilute hydrochloric acid with
1. iron (II) sulphate
2. iron (II) sulphide
3. sodium sulphite
4. ammonium sulphate
A bottle containing lime water was left open for long time and a white solid was formed. The solid is .
1. calcium hydrogen carbonate
2. calcium oxide
3. calcium sulphate
4. calcium carbonate
During the extraction of sodium by the electrolysis of sodium chloride.
Calcium chloride is added in order to
1. remove the impurities
2. catalyze the reaction
3. lower the melting-point of sodium chloride
4. prevent oxidation of sodium
Which one of the following compounds does not cause hardness of water?
1. Calcium sulphate
2. Sodium hydrogen carbonate
3. Magnesium sulphate
4. Calcium hydrogen carbonate.
Which one of the following ions can be confirmed by the brown ring test?
1. C1-
2. NO3-
3. CO32-
4. SO42-
Which of the following products are formed when concentrated nitric acid
reacts with copper?
1. Copper oxide, water and nitrogen dioxide
2. Copper (II) nitrate, water and nitrogen monoxide
3. Copper oxide, water and nitrogen monoxide
4. Copper (II) nitrate, water and nitrogen dioxide.
How many Cl- ions surround each Na+ ion in a sodium chloride crystal?
1. 4
2. 6
3. 8
4. 10
Lead (II) chloride can best be prepared by the reaction between
1. lead metal and concentrated hydrochloric acid.
2. lead oxide and dilute hydrochloric acid
3. lead nitrate and dilute hydrochloric acid
4. lead carbonate and dilute hydrochloric acid.
What would be the overall electrochemical change in an electrochemical cell where copper and zinc electrodes are immersed in I M sulphuric acid?
1. .
2. .
3. .
4. .
The graph in figure 1 shows the variation in the volume of hydrogen evolved with time when excess zinc reacts with dilute sulphuric acid using Copper (II) Sulphate as a catalyst.

The best explanation for the shape of the graph between P and Q is
1. the zinc is used up
2. the products stopped the reaction.
3. sulphuric acid is used up
4. the catalyst is used up.
Which one of the following oxides below is soluble in both excess sodium hydroxide solution and excess aqueous ammonia?
1. .
2. .
3. .
4. .
When 2.5 g of a solid is heated, 560cm3 of a gas was produced at s.t.p and a residue of 1 .4g was left. The molecular mass of the gas is
1. .
2. .
3. .
4. .
What is the molarity of sodium hydroxide solution if 3cm3 of 0.2 M hydrochloric acid just neutralized 20cm3 of The alkali?
1. .
2. .
3. .
4. .
The table below shows the number of protons, electrons and r outruns of atom R, S, T, U and V. Use the information in the table to answer questions 31 to 34.
1. R and S
2. S and T
3. U and V
4. S and V
Which atoms form positive ions of the same charge?
1. R and S
2. R and U
3. U and V
4. S and V
Which of the above atoms belong to an inert element?
1. R
2. S
3. T
4. U
If atom R belong to element R and atom V belong 10 element V. what would be the formula of the compound formed between element R and V?
1. .
2. .
3. .
4. .
The formula of the oxide formed when steam is passed over healed iron is
1. .
2. .
3. .
4. .
Which one of the following ions forms a green precipitate with excess sodium hydroxide?
1. .
2. .
3. .
4. .
Which one of the following nitrates does not decompose on heating to produce nitrogen dioxide?
1. Copper nitrate
2. Lead nitrate
3. Sodium nitrate
4. Silver nitrate
A gas that when bubbled through bromine water changes the colour of bromine water from reddish-brown to colourless is
1. methane
2. ethane
3. ethene
4. hydrogen.
1. 1
2. 2
3. 3
4. 4
Which one of the following sets contains natural fibres only?
1. Nylon, wool, cotton
2. Cotton, nylon, silk
3. Silk, nylon, wool
4. Cotton, wool silk
Each of the questions 41 to 45 consists of an assertion (statement) on the left-hand side and a reason on the right-hand side
Select:
A. if both the assertion and the reason are true statements and the reason is a correct explanation of the assertion.
B. if both the assertion and the reason are true statements but the reason is not a correct explanation of the assertion.
C. if the assertion is true but the reason is not a correct statement.
D. if the assertion is not correct but the reason is a correct statement.
The molar heats of neutralizations of strong acids with strong alkalis are all approximately equal because the only reaction involved is H+ combining with OH- to form water.
1. .
2. .
3. .
4. .
Chlorine bleaches dyes because chlorine is an oxidising agent.
1. .
2. .
3. .
4. .
Sodium, lithium and potassium are in the same group of the periodic table
because they are all metals.
1. .
2. .
3. .
4. .
Alkali metals are stored under oil because they melt and boil at low temperature compared with other metals.
1. .
2. .
3. .
4. .
Nitrogen is a chemically inert substance because nitrogen is a diatomic
1. .
2. .
3. .
4. .
MULTIPLE COMPLETION QUESTIONS
Which of the following will be dehydrated by concentrated sulphuric acid?
1.Lime
2. Ethanol
3. Soda ash
4. Sugar.
1. .
2. .
3. .
4. .
Which of the following compounds arc responsible for causing fur in kettles used for boiling water?
1. Calcium sulphate
2. Calcium carbonate
3. Magnesium sulphate
4. Magnesium carbonate.
1. .
2. .
3. .
4. .
Which of the following react ion(s) can occur?
1. .
2. .
3. .
4. .
Which of the following is / are true about mixture?
1. Their composition, by mass of elements present are fixed.
2. They are not accompanied by change in mass during formation.
3. They are accompanied by evolution of heat during formation.
4. Their composition of mass of elements present vary.
1. .
2. .
3. .
4. .
Sold G conducts electricity and has a very high melting point G is likely to have —
1. metallic structure
2. giant molecular structure
3. giant atomic structure
4. giant ionic structure.
1. .
2. .
3. .
4. .

Chemistry Test Paper 10

KAWA Chemistry Quiz