A spot of oil paint on a shirt can best be removed using?
- A. brine
- B. detergent
- C. kerosine
- D. warm water
The hydrolysis of NH\(_4\)CI gives
- A. an acidic solution
- B. an alkaline solution
- C. a buffer solution
- D. a neutral solution
Which of the following pH values indicates that a solution is a strong base?
- A. 1
- B. 5
- C. 9
- D. 13
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except
- A. ammonium trioxocarbonate (IV)
- B. calcium trioxocarbonate (IV)
- C. lead (ll) trioxocarbonate(IV)
- D. zinc trioxocarbonate (IV)
A substance L reacts with NH\(_4\)NO\(_{3(aq)}\) to generate ammonia gas. L is likely to be
- A. HCl
- B. NaOH
- C. CH3COOH
- D. CaSO4
The energy evolved when magnesium burns in air is in the form of
- A. heat
- B. heat and sound
- C. light and heat
- D. sound
Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]
- A. CI2
- B. H2
- C. He
- D. O2
The postulate that molecules are in constant random motion best explains why liquids
- A. can undergo solidification
- B. maintain their volumes
- C. are incompressible
- D. have no characteristic shape
At ordinary temperature H\(_2\)O is a liquid while H\(_2\)S is a gas. This is because H\(_2\)O has
- A. weak intermolecular forces holding its molecules together
- B. strong hydrogen bonds holding its molecules together
- C. induced dipole-induced dipole forces between its molecules
- D. ionic force between its molecules
When a substance changes directly from the solid state to the gaseous state without forming a liquid, the substance is said to
- A. condense
- B. evaporate
- C. sublime
- D. precipitate
The volume occupied by 0.4 g of hydrogen gas at s.t.p. is [H = 1. 00; Molar volume at s.t.p. = 22.4 dm3]
- A. 2.24 dm3
- B. 4.48dm3
- C. 22.4dm3
- D. 44.8dm 3
Which of the following metals would readily displace hydrogen from steam?
- A. Copper
- B. Lead
- C. Magnesium
- D. Silver
A metal M forms two types of chlorine, MCl\(_2\) and MCl\(_3\) which of the following laws best explains the relationship between the chlorides? Law of
- A. conservation of mass
- B. definite proportion
- C. multiple proportion
- D. reciprocal proportion
A sample of a gas may be identified as chlorine if it turns
- A. damp blue litmus paper red
- B. lime water miky
- C. lead ethanoate paper black
- D. starch iodide paper blue-black
The formula of mercury (l) dioxonitrate (III) is
- A. HgNO3
- B. Hg2NO2
- C. Hg2(NO2)2
- D. Hg(NO3)2
Consider the reaction represented by the following equation: xCH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + zH\(_2\)O. The values of x,y and z respectively, are
- A. 2,3 and 4
- B. 2, 4 and 3
- C. 1,2 and 3
- D. 1, 3 and 5
The number of sulphur atoms in 3.20g of SO\(_{2(g)}\) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 x 10\(^{23}\)]
- A. 3.01 x 1022
- B. 6.02 x 1022
- C. 6.02 x1023
- D. 1.20 x 1024
Consider the following reaction equation: CaCO\(_{3(s)}\) + 2HCI\(_{(aq)}\) → CaCl\(_{2(aq)}\) + H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\). What mass of CaCI\(_2\) would be obtained when 25.0g of CaCO\(_{3(s)}\) is reacted with excess HCI\(_{(aq)}\)? [CaCO\(_3 = 100; CaCI\(_2\) = 111]
- A. 4.00g
- B. 4.44 g
- C. 18.9 g
- D. 27.8 g
MgO does not readily dissolve in water because
- A. of its high melting point
- B. it is a covalent compound
- C. it forms a hydroxide when dissolved in water
- D. its lattice energy is higher than its hydration energy
The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together
- A. l only
- B. l and ll only
- C. l and lll only
- D. ll and lll only
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
- A. Na3Al(OH)4.
- B. NaAl(OH)4
- C. NaAl(OH)3
- D. Na2Al(OH)3