FIRST TERM EXAMINATION ACADEMIC SESSION

 

 

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FIRST TERM EXAMINATION

ACADEMIC SESSION

SUBJECT: CHEMISTRY

CLASS: S.S.S 3

INSTRUCTION: ANSWER ALL QUESTIONS IN THIS SECTION

  1. Citric acid appears in unripe orange while ethanoic acid appears in ___________ (a) unripe pawpaw (b) carrot (c) ethanol sourced (d) vinegar
  2. Esters are employed in the following except ___________ (a) making perfumes (b) nail vanishes (c) making cement (d) making solvent for cellulose trioxonitrates
  3. The name of (CH3)2 CHC00H is ___________ (a) propanoic acid (b) 2-methyl propanoic acid (c) dimethyl butanoic acid (d) 2,2, dimethyl propanoic acid
  4. Oil can change into fat in the presence of nickel at 1800c through a process called ___________ (a) alkylation (b) hydrogenation (c) polymerization (d) substitution
  5. All carbonhydrates contain (a) carbon and oxygen (b) carbon and hydrogen (c) carbon, oxygen, and hydrogen (d) carbon, sulphur and hydrogen
  6. Ethanedioc acid is ___________ acid (a) a mineral acid (b) a common fatty acid (c) a dicarboxylic acid (d) an aromatic carboxylic acid
  7. The general formula for, carbohydrate is ___________ (a) CnH2n0 (b) CnH2n 0n (c) C2n Hn 0n (d) Cn H2n + 2
  8. These are not true transition element except ___________ (a) Zn (b) Sc (c) Cu (d) N
  9. The name of C5Hu C00 C4H9 is ___________ (a) Butyl pentanoate (b) Butyl hexanoate (c) Butyl butanoate (d) Butyl heptanoate
  10. Which one is the most common iron ore? (a) Magnitite (b) spathic iron ore (c) Haematite (d) Dolomite
  11. Bronze card bass are both metallic alloys, which of these constituent is common to both alloys? (a) copper (b) lead (c) silver (d) zinc
  12. Conversion of coke to carbon (II) oxide in a furnace is _________ (a) Enthermic (b) Isothermic (c) exothermic (d) hyposthermic
  13. The following are characteristics of the transition element with the exception of ___________ (a) coloured ions (b) variables oxidation state (c) high tendency to catenate (d) complex ion formation
  14. Wrought iron is the ___________ form of ion (a) most impure (b) most brittle (c) most carbon free (d) purest
  15. If the value of ∆H for a reaction is negative, it means that het reaction is ___________ (a) endothermic (b) exothermic (c) slow (d) spontaneous

H CH3 H H H H

l l l l l l

H – C – C – C – C – C – C – H

l l l l l l

H CH3 H H H H

The IUPAC nomenclature of the compound above is ___________ (a) 2 – dimethyl hexane (0b 2, 5 dimethyl hexane (c) 2, 2, – dimethyl hexane (d) 2, 2, – dimethyl hexane

  1. If the hydrolysis of groundnut oil by potassium hydroxide is known as ___________ (a) hydrogenation (b) saponification (c) esterification (d) neutralization
  2. When protein is heated to high temperature it undergoes (a) condensation (b) denaturation (c) hydrolysis (d0 polymerization
  3. Which of the following substances give a brick red precipitate when heated with fehlings solution (a) alkanoaies (b) carbohydrates (c) fats and oil (d) reducing sugar
  4. What is the major product formed when C2H50H reacts with CH3C00H? (a) C2H5 C00CH2 (b) C2H5C0CH2 (c) CH3C00C2H5 (d) C3H7C00H

THEORY: [ANSWER FOUR QUESTIONS]

1ai. Mention 2 physical properties of alkanoic acid

ii. Mention 2 uses of alkanoic acid

b. Write out four isomers of heptanoic acid

ii. Mention 2 uses of ethyl ethanoate

c. Explain the concepts of reversible reaction and give one equation

2ai. Define saponification

ii. What are disaccharide

b. Explain with equation, the preparation of ethanoic acid

c. Mention four chemical properties of ethanoic acid and equation two

3a. Mention 2 physical properties of fats and oils

i. What are fat and oil?

ii. Mention 2 chemical properties of fats and oil

c. Mention four use of fats and oils

4a. What are transition elements?

ii. Mention four properties of transition element and explain two

b. Mention 3 types of iron

5a. Write short notes on the following

(i) Cast iron

(ii) Pig iron

(iii) Wrought iron

b. Explain zinc is not a typical transition element

ii. Using equation of reaction, explain the extraction of iron from haematite.

 

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