Get Correct WAEC Chemistry Practical Questions & Answers 2022

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2022 WAEC Chemistry Practical Questions and Answers for SS3 school candidates. Are you among those looking for how to get Chemistry practical WAEC questions 2022? If yes, search no more because this article is for you. We will discuss how to get verified WAEC Chemistry practical expo correct questions and Answers, how to answer Tuesday, June 13th Chemistry practical WAEC questions 2022, and steps you need to pass the WAEC 2022 Chemistry practical exam at a sitting.

You’re about to write the 2022 WAEC Chemistry practical exam and you want to make sure that you are prepared for it. But how do you know what will be on the WAEC Chemistry practical exam? That’s why we created this article so that you can find all of the questions and answers right here!

In this article, we explore how you can get 2022 WAEC Chemistry practical questions so that you can be well-prepared for your upcoming WAEC exam, and also understand how WAEC set Chemistry practical questions and how to answer them. With this guide, you can make good grades on Chemistry practical WAEC 2022 exam.

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What is WAEC Chemistry Practical?

WAEC Chemistry practical is an examination set by the West African Examinations Council (WAEC) and it is taken by Science students.

Chemistry practical consists of one part. This one part are also know Paper 3.

Paper 3 of WAEC Chemistry Practical Questions 2022 will contain 3 questions.

WAEC Chemistry Practical Questions and Answers 2022

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Below possible objective questions for WAEC Chemistry Practical for ss3 students exam.

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C and are two aqueous solutions. Carry out the following exercises on and D. record your observations and identify any gas(es) evolved. State the conclusion you draw from the result of each test.
(a) (i) To about 2 cm3 portion of C, add NaOH(aq) in drops until in excess.
Warm the mixture.
(ii)To another 2 cm3 portion of C, add HCl(aq) followed by BaCl2(aq).                                                                                                                                                                                                                                   [9 marks]
(b) (i)         To about 2 cm3 portion of D, add NH3(aq) in drops and then in excess.

  1. To another 2 cm3 portion of D, add AgNO3(aq) followed by HNO3(aq).

The expected answers were:
According to WAEC

Test Observation Inference
(a) (i) C + NaOH(aq)
+ warm
No visible reaction/no ppt.
A colourless gas with pungent/chocking/irritating smell evolved. Gas turned damp red litmus blue/formed white fumes with conc. HCl vapour.
 

Gas is NH3 from NH4+

 

                              

     (ii)  C + HCl(aq)
+ BaCI2(aq)
No visible reaction.
White ppt formed.
 

SO42- present.

(b) (i) D + NH3(aq)
+ excess
Reddish-brown/brown ppt.
Ppt insoluble.
 

Fe3+  present.

     (ii)  D + AgNO3(aq)
+ HNO3 (aq)
White ppt.
Ppt insoluble.
C- or CO32- present.
C-  present.

 

(a)        Explain briefly the observations in each of the following processes:
(i)         when carbon(IV) oxide is bubbled through lime water, it turns milky but the milkiness disappears when the gas is bubbled for a long time;
(ii)        a precipitate of calcium hydroxide is insoluble in excess sodium hydroxide solution whereas that of lead (II) hydroxide is soluble.                                                                                                                               [5 marks]
(b)        (i)         What is a primary standard solution?
(ii)        Calculate the mass of sodium trioxocarbonate(IV)
required to prepare 250 cm3 of 0.15 moldm-3 solution.
[ Na = 23.0; O = 16.0; C = 12.0 ]                                     [5 marks]
(c)        Name one gas that can be collected by:

  1. upward displacement of air;
  2. downward displacement of air.                                                    [2 marks ]

Q3.  (a) (i)     Lime water turns milky with CO2 because  CaCO3/ CaCO3(s)  is formed.

Milkiness disappear when excess CO2 reacts with CaCO3 in water medium forming the soluble Ca(HCO3)2/ Ca(HCO3)2 (aq).

(ii)   Calcium hydroxide is not amphoteric. Does not react with an alkali NaOH whereas lead (II) hydroxide is amphoteric so reacts with excess NaOH.
 
(b)  (i)   Primary standard solution is one whose concentration is known and can be used to standardize another solution.
OR
Primary standard solution is a solution of known concentration prepared from pure/non-deliquescent/non-hygroscopic substance.

(ii)    M (Na2CO3)    =  106 gmol-1
m(Na2CO3)         =  C x M x V
=   0. 15 x 106 x 0. 25
=   3. 98 g                                 

(c)       (i)    Carbon(IV) oxide, sulphur (IV) oxide, hydrogen chloride, oxygen,
nitrogen (IV) oxide, chlorine, hydrogen sulphide.                                                                                               

Ammonia, oxygen, hydrogen, methane.          

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