What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]
- A. 0.40 moldm\(^{-3}\)
- B. 0.50 moldm\(^{-3}\)
- C. 0.05 moldm\(^{-3}\)
- D. 0.30 moldm\(^{-3}\)
An aqueous solution of a metal salt, M. gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia Therefore the cation in M is
- A. Zn
- B. Ca
- C. Al
- D. Pb
The lUPAC name for
- A. 1-methyl pentane
- B. 3-methylbutane
- C. 2-methylbutane
- D. 1-dimethyl propane
If one of the following oxides is heated with hydrogen or carbon using a bunsen burner. it is not reduced to the metal, Which one is it?
- A. lead oxide
- B. Magnesium oxide
- C. Copper oxide
- D. Tin oxide
What volume of oxygen will remain after reacting 8cm\(^3\) of hydrogen gas with 20cm\(^3\) of oxygen gas
- A. 10cm\(^3\)
- B. 12cm\(^3\)
- C. 14cm\(^3\)
- D. 16cm\(^3\)
The number of electrons in the valence shell of an element of atomic number 14 is?
- A. 1
- B. 2
- C. 3
- D. 4
Suitable reagents for the laboratory preparation of nitrogen are
- A. sodium dioxonitrate(III) and ammonium chloride
- B. sodium trioxonitrate(V) and ammonium chloride
- C. sodium chloride and ammonium trioxonitrate(V)
- D. sodium chloride and ammonium di-ozonitrate(III)
A quantity of electricity liberates 3.6g of Silver from its salt. What mass of aluminium Will be liberated from its salt by the same quantity of electricity? [Al = 27, Ag = 108].
- A. 2.7g
- B. 1.2g
- C. 0.9g
- D. 0.3g
Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of Sand, water and methanoic acid?
- A. Extractive distillation
- B. Filtration followed by distillation
- C. Neutralization with sodium hydroxide followed by distillation
- D. Neutralization with sodium hydroxide followed by filtration
In the preparation of oxygen by heating KCIO\(_3\) , in the presence of MnO\(_2\) only moderate heat is needed because the catalyst acts by \(_2\)
- A. lowering the pressure of the reaction
- B. increasing the surface area of the reaction
- C. increasing the rate of the reaction
- D. increasing the energy barrier of the reaction
Which of the following pairs of substances will react further with oxygen to form a higher oxide?
- A. CO\(_2\) and H\(_2\)O
- B. NO and H\(_2\)O
- C. CO and CO\(_2\)
- D. SO\(_2\) and NO
The boiling of fat and aqueous caustic soda is referred to as
- A. hydrolysis
- B. esterification
- C. acidification
- D. saponification
In the shown experiment (Fig. 1) the litmus paper will initially
- A. be bleached
- B. turn green
- C. turn red
- D. turn blue
If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be
- A. 2.2M
- B. 1.1M
- C. 0.2M
- D. 0.11M
The periodic classification is an arrangement of the elements
- A. atomic weights
- B. isotopic weights
- C. molecular weights
- D. atomic numbers
Which of the following statements is correct about the periodic table?
- A. Elements in the same period have the same number of valence electrons
- B. The valence electrons of the elements in the same period increase progressively across the period
- C. Elements in the same group have the same number of electron shells
- D. The non-metallic Properties of the elements tend to decrease across each period
On which of the following is the solubility of a gaseous substance dependent?
I. Nature of solvent
II. Nature of solute
III. Temperature
IV. Pressure
- A. I, II, III and IV
- B. I and II only
- C. II only
- D. III and IV only
A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that
- A. collisions are perfectly elastic
- B. forces of repulsion exist
- C. forces of repulsion and attraction are in equilibrium
- D. collisions are inelastic
A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
- A. Al and Mg
- B. Zn and Fe
- C. Zn and Pb
- D. Pb and H
The Consecutive members of an alkane homologous series differ by
- A. CH
- B. CH\(_2\)
- C. CH\(_3\)
- D. C\(_n\)H\(_n\)
Which of the following gases may not be dried with concentrated sulphuric acid?
- A. HCl\(_{(g)}\)
- B. NH\(_3\)
- C. Cl\(_2\)
- D. SO\(_2\)