- 1. Diamond does not conduct electricity because it .........
A) Is solid at room temperature
B) Is a giant molecule
C) Has no free valence electrons
D) Contains no bonded electrons
- 2. Animal charcoal differs from wood charcoal in that it ................
A) Is rich in phosphate content
B) Has a good carbon content
C) Has a dark colour
D) Is a good absorbent
- 3. The liquid product of the destructive distillation of coal is ............
A) Coal gas
B) Aqueous ammonia
C) Ethanol
D) Ammoniacal liquor
- 4. A salt that absorbs moisture from the atmosphere without forming solution is said to be.......
A) Deliquescent
B) Insoluble
C) Hygroscopic
D) Efflorescent
- 5. which of the following would change the colour of blue litmus paper? An aqueous solution of:
A) Sodium chloride
B) Ammonium
C) Potassium hydroxide
D) Chloride
- 6. The loss of molecules of water of crystallisation to the atmosphere by some crystalline salts in known as ..........
A) Efflorescence
B) Deliquescence
C) Effervescence
D) Fluorescence
- 7. Which of the following is a normal salt?
A) (NH4)_2SO4
B) Zn(OH)Cl
C) Ca(HCO3)_2
D) KHSO4
- 8. The alkaline nature of an aqueous solution of sodium trioxocarbonate (iv) is due to the process of...........
A) Hydrolysis
B) Dehydration
C) Decomposition
D) Hydration
- 9. Producer gas is a mixture of ......
A) CO and N2
B) CO and H2
C) CO2 and H2
D) CO2 and N2
- 10. Hydrocarbons are organic compounds composed of which two elements?
A) Carbon and nitrogen
B) Carbon and sulfur
C) Carbon and oxygen
D) Carbon and hydrogen
- 11. Crude oil is a mixture of hydrocarbons primarily derived from:
A) Volcanic eruptions
B) Plants and animals
C) Geological processes over millions of years
D) Synthetic chemical reactions
- 12. Which of the following is a test for the presence of the trioxocarbonate(IV) ion, CO32-?
A) Effervescence occurs when acid is added
B) A white precipitate forms when silver nitrate is added
C) Blue litmus paper turns red
D) A green flame is observed
- 13. What type of reaction does the following equation represent?
H3O+(aq) + OH- (aq) ---> 2H₂O (l)
A) Reduction
B) Neutralisation
C) Oxidation
D) Hydrolysis
- 14. X forms a trivalent cation while Y forms a divalent anion. The dissociation of a compound of X and Y can be written as
A) 3XY₂ → X3+ + Y2-
B) X3Y₂ → X3+ + Y2-
C) X2Y3 →2X3+ + 3Y2-
D) XY → X3+ + Y2-
- 15. What quantity of electrons (in mole) is lost when one mole of ion (II) ions is oxidised to ion (III) ions.
A) 2 moles
B) 3 moles
C) 4 moles
D) 1 mole
- 16. The oxidation number of X in XO4³- is
........
A) +2
B) +4
C) +3
D) +5
- 17. The collective name for elements in the group seven is the ----------
A) halogens
B) alkali metals
C) alkalin-earth metals
D) inert gases
- 18. The position of an element on the periodic table is determined by........
A) its density
B) its atomic radius
C) the number of protons in its atom.
D) its relative atomic mass
- 19. The element with electronic configuration Is2 2s2 2p6 3s2 is
.....
A) a halogen
B) a metal
C) an inert gas
D) a non-metal
- 20. Lithium and sodium show similar chemical properties. Which of the following statements is not true about the two elements?
A) Both exist in the +1 oxidation state in their compound
B) They belong to the same group in the periodic table
C) They are in the same period in the periodic table
D) They have equal number of electrons in their outermost shells
- 21. The electronic configuration of elements X, Y and Z are as follows X- Is2 2s2 2p6 3s2 Y - Is² 2s² 2p6 3s2 3p¹ Z-Is² 2s²2p6 3s2 3p2 To which period do X, Y and Z belong?
A) 4
B) 3
C) 1
D) 2
- 22. Which of the following statements about the elements, Na, Mg, Al and Si is / are true?
I. They are all in period 3 of the periodic table II. Mg is more electropositive than Si
III. Electropositivity decreases from Na to Si IV. Si is the most electropositive element.
A) I only
B) I, II and III only
C) I and IV only
D) I, II, III and IV
- 23. The element with the electronic
configuration Is2 2s2 2p6 3s2 3p6 3d2 4s² is a/an
A) transition metal
B) group II element
C) group IV element.
D) alkaline earth metal
- 24. Li, Na, and K are in the same group in the periodic table because they have the same. ........
A) ionisation energy
B) electronic configuration
C) number of valence electrons
D) atomic radius
- 25. Use the diagram above to answer the following question. The letters indicating elements which exist as monoatomic gases are
......
A) P and Q
B) X and R
C) R and S
D) T and W
- 26. Use the diagram above to answer the following question. Which of the following pairs of letters denotes elements containing the same number of electrons in their outermost shells?
A) S and T
B) P and Q
C) T and P
D) R and X
- 27. Use the diagram above to answer the following question. What letter represents an element that undergoes covalent bonding?
A) Q
B) T
C) R
D) S
- 28. Use the diagram above to answer the following question. Which letter represents a halogen?
A) S
B) R
C) X
D) P
- 29. What is the most probable group of an element which is a soft, silvery-white solid and reacts violently with water?
A) Group 6
B) Group 7
C) Group 4
D) Group 1
- 30. P, Q, R and S are metals in the same group in the periodic table but in periods 3,4,5 and 6 respectively. Which of them loses electrons least readily?
A) S
B) R
C) P
D) Q
|