Question 1

Compound Q is a white crystalline solid which dissolves easily in water.

When concentrated sulfuric acid is added to a dry sample of Q steamy white fumes are formed which, when passed through aqueous silver nitrate solution, form a white precipitate. This precipitate is soluble in dilute ammonia solution.

What could be the identity of compound Q?

  A  

AgCl

  B  

NaBr 

  C  

NaCl 

  D  

PbBr2

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Question 2

An aqueous solution of a salt gives a white precipitate when mixed with aqueous silver nitrate and when mixed with dilute sulfuric acid.

Which could be the formula of the salt?

  A  

BaCl2

  B  

(NH4)2SO4

  C  

KCl

  D  

Sr(NO3)2

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Question 3

What is the most suitable reagent for detecting the presence of carbonate ions in the presence of an excess of sulfate ions?

  A  

dilute NaOH(aq)

  B  

dilute H2SO4(aq)

  C  

BaCl2(aq)

  D  

NaCl(aq)

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Question 4

In the test for a halide ion in aqueous solution, dilute nitric acid is added before the addition of silver nitrate solution.

Why is nitric acid added?

  A  

it increases the concentration of nitrate ions

  B  

it prevents the precipitation of silver compounds other than halides

  C  

it prevents the silver nitrate being precipitated

  D  

it provides the acidic solution required for precipitation

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