An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
- A. I and II
- B. I and III
- C. I and IV
- D. II and III
- E. II and IV
The best way to distinguish between Na2CO3and NaHCO2 is by.
- A. adding an acid.
- B. adding an alkali.
- C. dissolving in water.
- D. exposing to air.
- E. heating.
The Kinetic theory can NOT be used to explain
- A. allotropy.
- B. Brownian movement.
- C. diffusion.
- D. Tyndal effect.
- E. vaporization.
The molar mass of a compound X is 56. its empirical formula is CH2. X is
- A. butene.
- B. butyne.
- C. ethene.
- D. propene.
- E. propyne
Which compound will have the lowest boiling point?
- A. CH3OH
- B. CH3COOH
- C. CH3CHOH
- D. C4H10
- E. (CH3)3CH
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
- A. Becquerel.
- B. Bohr.
- C. de Broglie.
- D. Rutherford.
- E. Thompson.
White is NOT a property of metals?
- A. ductile:
- B. malleable
- C. conduct heat and electricity
- D. have many oxidation states
- E. high melting points anti boiling points
Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction
- A. I and II only
- B. I, II and III only
- C. II and III only
- D. II, II and IV only
- E. III and IV only
The high boiling point of hydrogen fluoride can be explained in terms of
- A. covalent bonds.
- B. dative bonds.
- C. dipole-dipole bonds.
- D. electrovalent (ionic) bonds
- E. hydrogen bonds.
The oxidation number of X in \(XO_{4}^{3-}\) is
- A. 1
- B. -2
- C. 3
- D. 4
- E. 5
How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
- A. 10.0 g
- B. 4.0g
- C. 2.0 g
- D. 1 .0g
- E. 0.1 g
What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161
- A. 1:01
- B. 1:01
- C. 2:01
- D. 2:03
- E. 3:01
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
- A. 3
- B. 9
- C. 10
- D. 18
- E. 32
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
- A. black
- B. blue
- C. green
- D. white
- E. yellow
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
- A. CH3COOH
- B. CH3COONaCCH3OH
- C. CH3OH
- D. C2H5OH
- E. C3H7COONa
The alloy used for welding and plumbing contains
- A. aluminum and copper.
- B. copper and tin
- C. iron and aluminum.
- D. lead and antimony.
- E. lead and tin.
in any chemical reaction, the total mass of products is always equal to that of the reactants.
This Is statement of the law of:
- A. conservation of matter.
- B. Constant composition
- C. definite proportions.
- D. multiple proportions.
- E. reciprocal proportions.
Which metal will dissolve in aqueous sodium hydroxide?
- A. aluminium
- B. copper
- C. iron
- D. sikeer
- E. tin
Which compound can be used as a reducing agent in a reaction?
- A. Cl2
- B. KMnO4
- C. KCr2O7
- D. MnO2
- E. Na2SO3
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
- A. Artificial radioactivity
- B. nuclear fission
- C. nuclear fusion
- D. radio-decomposition
- E. spontaneous disintegration
The position of an element in the Periodic Table is determined by?
- A. its atomic radius.
- B. its density.
- C. its relative atomic mass.
- D. the number of protons in its atom.
- E. the number of neutrons in its atoms