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  • kcse form 2 mathematics questions

KCSE Chemistry Topical Questions and Answers Dashboard since 1995

1/1/2025

Comments

 
​These are chemistry questions and answers categorized according to topics, papers i.e. Paper 1 and 2, Levels i.e. form 1 to form 4, kcse year the examination was done and section A or B
Select topic/category to open topical questions from that particular option provided.

​Chemistry Topics

Vertical Divider

A

  1. All
  2. Acid Bases And Indicators
  3. Acids Bases And Salts
  4. Air And Combustion
  5. Alkaline
KCSE Chemistry Topical Questions and Answers Dashboard since 1995

C

  1. Carbon And Its Compounds
  2. Chemical Families
  3. Chlorine And Its Compounds

E

  1. Electric Current On Substance
  2. Electrochemistry I And Ii
  3. Energy Changes In Chemical And Physical Processes

F

  1. Form 1 Level
  2. Form 2
  3. Form 3
  4. Form 4

G

  1. Gas Laws

I

  1. Introduction To Chemistry

K

  1. Kcse-1995
  2. Kcse-1996
  3. Kcse-1997
  4. Kcse-1998
  5. Kcse 1999
  6. Kcse-2000
  7. Kcse-2001
  8. Kcse-2002
  9. Kcse-2003
  10. Kcse-2004
  11. Kcse2005
  12. Kcse-2005
  13. Kcse-2006
  14. Kcse2007
  15. Kcse-2007
  16. Kcse-2008
  17. Kcse-2009
  18. Kcse-2010
  19. Kcse-2011
  20. Kcse-2012
  21. Kcse-2013
  22. Kcse-2014
  23. KCSE 2015
  24. KCSE 2016
  25. KCSE 2017
  26. KCSE 2018
  27. Kcse 2019

M

  1. Metals

N

  1. Nitrogen And Its Compounds

O

  1. Organic Chemistry I
  2. Organic Chemistry II

P

  1. Paper 1
  2. Paper 2

  1. Periodictable
  2. Properties-and-trends-across-the-period

R

  1. Radioactivity
  2. ​Reaction Rates And Reversible Reactions

S

  1. Salts
  2. Simple Classification Of Substances
  3. Structure Of The Atom And The Periodic Table
  4. Structures And Bonding
  5. Sulphur And Its Compounds

T

  1. The Mole

W

  1. Water And Hydrogen
Comments

Below is a simplified diagram of a Down’s cell used for the manufacture of Sodium metal. Study it and answer the questions that follow.

14/10/2021

Comments

 
Below is a simplified diagram of a Down’s cell used for the manufacture of Sodium metal. Study it and answer the questions that follow.
Above is a simplified diagram of a Down’s cell used for the manufacture of Sodium metal. Study it and answer the questions that follow.

​a) Name the substance the anode is made of (1mk)

​Graphite

​b) Explain your answer in (a) above (1mk)

​Reject carbon
​Graphite does not react with chlorine liberated at the anode 


​c) What is the role of the diaphragm in Down’s cell (1mk)

​To prevent metal and chlorine gas from recombining

d) In Down’s cell for the manufacture of Sodium metal, Calcium chloride salt is added to lower the melting point from 8000C to 6000C. Explain why it is necessary to lower the melting point (1mk)

​To reduce the cost of energy used to melt the sodium metal 

​e) Calculate the mass of sodium metal produced if a current of 50 amperes is passed through the molten Sodium chloride for two (2) hours (Na = 23, F = 96500C) (2mks)

Picture

​f) Below is a list of potential differences obtained when metal P, Q, R, S and T are used in the following electrochemical cell
Metal (s) / Metal ions // Copper (II) ions / copper (s) 

Below is a list of potential differences obtained when metal P, Q, R, S and T are used in the following electrochemical cell
Below is a list of potential differences obtained when metal P, Q, R, S and T are used in the following electrochemical cell

​i) Which metal is likely to be Copper. Explain (2mks)

​R

​ii) Identify the strongest reducing agent (1mk)

​P


​iii) Which two half – cells would be combined to produce the highest voltage? (1mk)

​P and T

​iv) Give a cell representation of the cell in F (iii) above. (2mks)

​P/p ions // T ions /T (s) 

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Comments

The cell convention for an electrochemical cell is shown below

11/10/2021

Comments

 

​The cell convention for an electrochemical cell is shown below

Picture

​a) Name two substances that can be used as electrolytes in the above cell (2mks)

Zinc sulphate or any other solution with zinc ions 

​b) Which of the electrodes is the anode? (2mks)

​Lead electrode

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Comments

When an electric current was passed through molten substances M and N in different containers the observations in the table below were made

8/10/2021

Comments

 

​When an electric current was passed through molten substances M and N in different containers the observations in the table below were made


Molten M Conduct electric current and is not decomposed
Molten N  Conduct electric current and a gas is formed at one of the electrodes
    
   

Suggest the type of bonding present in;

a) Substance M                                        (1mk)


Metallic bond 

b) Substance N                                        (1mk)

Ionic bond 

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Comments

K.C.S.E Chemistry Q & A-MODEL 2018.PP2.Q N.3

25/11/2020

Comments

 

KCSE Chemistry 2018 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​(a) Complete Table I by indicating the observations, type of permanent or temporary change and name of new compound formed.
Picture
(b) Use the set-up in Figure 3 to answer the questions that follow. The flask was covered with a cloth that had been soaked in ice-cold water.
Picture
(i)State the observation made on the coloured water. Explain.
(ii) Name the gas law illustrated in Figure 3. 
(c)Use the standard electrode potentials in Table 2 to answer the questions that follow.
Picture
​(i)Write the half-cell representation for the element whose electrode potential is for hydrogen. 
(ii) Arrange the elements in order of reducing power, starting with the weakest reducing agent. 
(iii) I Select two half cells which combine to give a cell with the least e.m.f. 
II Calculate the e.m.f of the half cells identified in (iii) I. 
ANSWERS
Picture

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Comments

K.C.S.E Chemistry Q & A-MODEL 2017.PP2.Q N.6

23/11/2020

Comments

 

KCSE Chemistry 2017 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The following steps were used to analyse a metal ore.
(i) An ore of a metal was roasted in a stream of oxygen. A gas with a pungent smell was formed which turned acidified potassium dichromate(VI) green.
(ii) The residue left after roasting was dissolved in hot dilute nitric(V) acid. Crystals were obtained from the solution.
(iii) Some crystals were dried and heated. A brown acidic gas and a colourless gas were evolved and a yellow solid remained. (iv) The solid was yellow when cold.
(v) The yellow solid was heated with powered charcoal. Shiny beads were formed.
Name the:
(a) gas formed when the ore was roasted in air. 
(b) gases evolved when crystals in step (iii) were heated. 
(c) yellow solid formed in step (iii). 
(d) shiny beads in step (iv). 
(e) The yellow solid from procedure (iii) was separated, dried, melted and the melt electrolysed using graphite electrodes.
I. Describe the observations made at each electrode. 
II. Write the equation for the reaction that took place at the anode. 
(f) Some crystals formed in step (ii) were dissolved in water, and a portion of it reacted with potassium iodide solution. A yellow precipitate was formed. Write an ionic equation for this reaction. 
(g) To another portion of the solution from (f), sodium hydroxide solution was added drop by drop until there was no further change. Describe the observation made. 
(h) To a further portion of the solution from (f), a piece of zinc foil was added.
I. Name the type of reaction taking place. 
II. Write an ionic equation for the above reaction.
ANSWERS
Picture
Picture

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K.C.S.E Chemistry Q & A-MODEL 2017.PP1.Q N.22

23/11/2020

Comments

 

KCSE Chemistry 2017 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


(a) What is an inert electrode? 
(b) State the products formed when brine is electrolysed using inert electrodes. 
Anode: 
Cathode: 
ANSWERS
(a)Inert electrode is one which does not participate in the reaction / does not affect the products of electrolysis / does not react;
(b)Anode - chlorine;
Cathode - Hydrogen;

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Comments

K.C.S.E Chemistry Q & A - MODEL 2017.PP1.QN.3

22/11/2020

Comments

 

KCSE Chemistry 2017 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The diagram in Figure 1 shows a section of a dry cell. Study it and answer the questions that follow.
Picture
​(a) Name the part labelled B. 
(b) The part labelled A is a paste. Give a reason why it is not used in dry form. 
(c) What is the purpose of the zinc container?
ANSWERS
​(a)Carbon electrode (Anode) /Graphite electrode.
(b)To allow movement of ions / to have it as an electrolyte. When dry, the ions are immobile.
(c)It is the cathode / negative electrode.

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Comments

K.C.S.E Chemistry Q & A - MODEL 2016.PP2.QN.5

22/11/2020

Comments

 

KCSE Chemistry 2016 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The diagram below represents a set up of an electrolytic cell that can be used in the production of aluminium.
Picture
​(a) On the diagram, label the anode.
(b)Write the equation for the reaction at the anode.
(c) Give a reason why the electrolytic process is not carried out below 950°C.
(d)Give a reason why the production of aluminium is not carried out using reduction process
(e)Give two reasons why only the aluminium ions are discharged
(f)State two properties of duralumin that makes it suitable for use in aircraft industry.
(g)Name two environmental effects caused by extraction of aluminium.
ANSWERS
Picture
Picture

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Comments

K.C.S.E Chemistry Q & A - MODEL 2016.PP2.QN.4

22/11/2020

Comments

 

KCSE Chemistry 2016 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


The set up below can be used to produce sodium hydroxide by electolysing brine.
Picture
(i) Identify gas Y.
(ii)Describe how aqueous sodium hydroxide is formed in setup above.
(iii)One of the uses of sodium hydroxide is in manufacture of soaps. State one other use of sodium hydroxide.
(b) Study the information given in the table below and answer the questions that follow.
Picture
(i) Construct an electrochemical cell that will produce the highest
(ii) Calculate the emf of the cell constructed in (i) above.
(iii)Why is it not advisable to store a solution containing E+ ions in the container made of H? 
ANSWERS
Picture
Picture

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Comments

KCSE Chemistry Q & A - MODEL 2019.PP2.QN.6

21/11/2020

Comments

 

KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​(a) What is meant by standard electrode potential of a an element? (1 mark)
​(b) use the standard electrode potentials given below to answer the questions that follow.
use the standard electrode potentials given below to answer the questions that follow

(i) State whether acidified MnO4- can oxidise M2+. Give a reason. (2 marks)

(ii) Select two half-cells which when combined will give the highest e.m.f. (1 mark)

(iii) Write the cell representation for the cell formed in b (ii). (I mark)

(iv) Calculate the E0 value for the cell formed in b (iii). (2 marks)


(c) A mass of 1.24g of a divalent metal was deposited when a current of 6A was passed through a solution of the metal sulphate for 12 minutes. Determine the relative atomic mass of the metal.

(1 Faraday = 96,500 C mol-1 (3 marks)

(d) State two applications of electrolysis. (I mark)

Expected Response
(a) What is meant by standard electrode potential of an element (1 mark) (b) Use the standard electrode potentials given below to answer the questions that follow. (i) State whether acidified MnO-4 can oxidise M2+. Give a reason. (2 marks) (ii) Select two half-cells which when combined will give the highest e.m.f. (1 mark) (iii) Write the cell representation for the cell formed in b (ii). (1 mark) (iv) Calculate the Eθ value for the cell formed in b (iii). (1 mark) (c) A mass of 1.24g of a divalent metal was deposited when a current of 6A was passed through a solution of a metal sulphate for 12 minutes.Determine the relative atomic mass of the metal( Faraday = 96,500 C mol -1 (3 mark) (d) State two application s of electrolysis. (I mark)
(a) What is meant by standard electrode potential of an element (1 mark) (b) Use the standard electrode potentials given below to answer the questions that follow. (i) State whether acidified MnO-4 can oxidise M2+. Give a reason. (2 marks) (ii) Select two half-cells which when combined will give the highest e.m.f. (1 mark) (iii) Write the cell representation for the cell formed in b (ii). (1 mark) (iv) Calculate the Eθ value for the cell formed in b (iii). (1 mark) (c) A mass of 1.24g of a divalent metal was deposited when a current of 6A was passed through a solution of a metal sulphate for 12 minutes.Determine the relative atomic mass of the metal( Faraday = 96,500 C mol -1 (3 mark) (d) State two application s of electrolysis. (I mark)

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K.C.S.E Chemistry Q & A - MODEL 2015.PP2.QN.4

18/11/2020

Comments

 

KCSE Chemistry 2015 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


a) The diagram below represents a dry cell. Use it to answer the quest ions that follows.
Picture
i) Which of the letters represent
i) Carbon electrode? 
ii) The electrolyte? 
ii) One of the substances used in a dry cell is manganese (IV) oxide. State two roles of manganese (IV) oxide in the dry cells 
b) Below is simplified electrolytic cell used for purification of copper. Study it and answer the questions that follows.
Picture
​i) Identify the cathode 
ii) Write the equation for the reaction at the anode 
iii) What name is given to L? 
iv) A current of 0.6 A was passed Through the electrolyte for 2 hours.
Determine the amount of copper deposited (Cu=63.5; 1 Faraday = 96,500 coulombs) 
v) St ate two uses of copper metal 
ANSWERS
​(a) (i) I F
          II G
(ii) - Manganese (IV) oxide oxidises hydrogen to water /depolariser .
- It increases the surface area of the electrolyte 
(b) (i) Cathode J.
Picture
​(v)Uses of copper metal - soldering bits / wires
- Electrical cables and alloys - coins, ornaments/lightening arrestors/ diodes/
- calorimeters. 

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KCSE Chemistry Q & A - MODEL 2019.PP1.QN.19

18/11/2020

Comments

 

KCSE Chemistry 2019 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Given that the E° of Cu(s) /Cu2+(aq) is +0.34 V and that of Zn (s)/Zn2+(aq) is —0.76 V, draw a labelled diagram of zinc and copper electrochemical cell. (3 marks)

Expected Response
Picture
Picture

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K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.18

17/11/2020

Comments

 

KCSE Chemistry 2015 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


​Study the standard electrode potentials in the table below and answer the questions that follow.
Picture
​(a) Which of the metals is the strongest reducing agent? 
(b) What observations will be made if a silver coin was dropped into an aqueous solution of copper (II) sulphate? Explain.
ANSWERS
(a) Calcium 
(b) No observable change  silver is below copper in the reactivity series so it cannot displace it.

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K.C.S.E Chemistry Q & A - MODEL 2015.PP1.QN.11

17/11/2020

Comments

 

KCSE Chemistry 2015 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3


Dilute sulphuric (VI) acid was electrolysed using platinum electrodes.
Name the product formed at the anode and give a reason for your answer.
ANSWERS
Picture

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    chemistry topical questions and answers for kcse exams

    Chemistry Topics

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    Electrochemistry I And II
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