Question 1

Carbon monoxide, CO, nitrogen monoxide, NO, and sulfur dioxide, SO2, may all be present in the exhaust fumes from a car engine.

Which reaction concerning these compounds occurs in the atmosphere?

  A  

CO is spontaneously oxidised to CO2

  B  

NO2 is reduced to NO by CO

  C  

NO2 is reduced to NO by SO2

  D  

SO2 is oxidised to SO3 by CO


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Question 2

Which reagent, when mixed and heated with ammonium sulfate, liberates ammonia?

  A  

aqueous bromine

  B  

dilute hydrochloric acid

  C  

limewater

  D  

potassium dichromate(VI) in acidic solution

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Question 3

One of the reactions taking place in a catalytic converter in a car exhaust system is between nitrogen oxide and octane (unburned petrol). The products of this reaction are non-toxic.

Which is the correct equation for the reaction?

  A  

C8H16 + 16NO ➔ 8CO + 8N2 + 8H2O

  B  

C8H16 + 24NO ➔ 8CO2 + 12N2 + 8H2O

  C  

C8H18 + 17NO ➔ 8CO2 + 8.5N2 + 9H2O

  D  

C8H18 + 25NO ➔ 8CO2 + 12.5N2 + 9H2O

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Question 4

Which statement explains the observation that magnesium hydroxide dissolves in aqueous ammonium chloride, but not in aqueous sodium chloride?

  A  

the ionic radius of the NH4+ ion is similar to that of Mg2+ but not that of Na+

  B  

NH4Cl dissociates less fully than NaCl

  C  

the Na+ and Mg2+ ions have the same number of electrons

  D  

the NH4+ ion can donate a proton

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Question 5

Nitrogen monoxide, NO, is a primary pollutant produced by petrol engines and is found in their exhaust gases.

Which reaction occurs in a catalytic converter and decreases the emission of nitrogen monoxide?

  A  

NO(g) + CO(g) ➔ NO2(g) + C(s)

  B  

NO(g) + CO2(g) ➔ NO2(g) + CO(g)

  C  

2NO(g) + 2CO(g) ➔ N2(g) + 2CO2(g)

  D  

2NO(g) + CO2(g) ➔ 2NO2(g) + C(s)

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Question 6

Ammonium sulfate in nitrogenous fertilisers in the soil can be slowly oxidised by air producing sulfuric acid, nitric acid and water.

How many moles of oxygen gas are needed to oxidise completely one mole of ammonium sulfate?

  A  

1

  B  

2

  C  

3

  D  

4

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Question 7

Which environmental problem is not made worse by the release of oxides of nitrogen from car engines?

  A  

acidification of lakes

  B  

corrosion of buildings

  C  

photochemical smog

  D  

the hole in the ozone layer

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Question 8

Water and ammonia take part in a reaction that produces the ammonium ion.

Which statement about this reaction is correct?

  A  

the ammonia molecule and the ammonium ion do not have dipole moments

  B  

the bond angle changes from 109.5° in the ammonia molecule to 107° in the ammonium ion

  C  

the reaction is a redox reaction

  D  

the water is acting as an acid

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Question 9

Which statement about nitrogen or its compounds is correct?

  A  

in the Haber process the temperature is kept high to give a good equilibrium yield of ammonia

  B  

nitrogen gas is unreactive because of the strong nitrogen-nitrogen double bond

  C  

nitrogen monoxide will react with carbon monoxide under suitable conditions

  D  

the formula of ammonium sulfate is NH4SO4

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Question 10

Which statement about the ammonia molecule and/or the ammonium ion is correct?

  A  

ammonia molecules are basic because they can donate H+ ions

  B  

ammonium ions are basic because they can accept H+ ions

  C  

if ammonium ions are heated with NaOH(aq), ammonia molecules are formed

  D  

the bond angle in NH4+ is 2.5° less than the bond angle in NH3

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Question 11

Which statement about NOx pollution is correct?

  A  

it is only produced in petrol engines

  B  

it can cause acid rain

  C  

it is not removed at all by catalytic converters

  D  

it consists mainly of NO3 gas

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