Which of the following are isomers?
- A. Ethanol and dimethyl ether
- B. Benzene and methybenzene
- C. Ethanol and propanone
- D. Trichloromethane and tetrachloromethane
Which of the following compounds reacts with sodium metal as well as silver and copper salts ?
- A. CH3C Ξ CβCH3
- B. CH3CH2CH23>
- C. CH3C Ξ CH
- D. CH3CH = CH CH3
The carbon atoms in ethene are?
- A. sp3 hybridized
- B. sp hybridized
- C. sp2 hybridized
- D. not hybridized
CaOs + H2O(l) β Ca(OH)2(s) ΞH -65 kj. The process represented by the above equation is known as?
- A. dissolution
- B. slaking
- C. liming
- D. mortaring
Duralumin consists of aluminium, copper, ?
- A. zinc and gold
- B. lead and maganese
- C. nickle and silver
- D. manganese and magnesium
Which of the following is NOT used as a raw material in the Solvay process?
- A. Ammonia
- B. Sodium chloride
- C. Calcium trioxocarbonate (IV)
- D. Sodium trioxocarbonate (IV)
Sodium hydroxide solution can be conveniently stored in a container made of?
- A. lead
- B. zinc
- C. aluminium
- D. copper
Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?
- A. nitrate
- B. carbonate
- C. chloride
- D. sulphide
Safety matches contain sulphur and the following except?
- A. sodium chloride
- B. potassium trioxonitrate (V)
- C. charcoal
- D. phosphorus sulphide
The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?
- A. hydrogen
- B. nitrogen (IV) oxide
- C. oxygen
- D. ammonium
The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?
- A. hydrogen
- B. nitrogen (IV) oxide
- C. oxygen
- D. ammonium
Which of the following oxides of nitrogen is unstable in air?
- A. NO2
- B. NO
- C. N2O4
- D. N2O5-
Which of the following combination of gases is used for metal welding? i. Oxygen and ethyne, ii. Hydrogen and ethyne, iii. Hydrogen and oxygen, iv. Ethyne, hydrogen and oxygen.
- A. i and ii
- B. ii and iv
- C. i and iii
- D. ii and iv
Which of these statements is TRUE about carbon (IV) oxide?
- A. it supports combustion
- B. It is strongly acidic in water
- C. It is very soluble in water
- D. It supports the buring of magnesium to produce magnesium oxide
For a general equation of the nature xP + yQ β mR + nS, the expression for the equilibrium constant is?
- A. k (p)x (Q)y
- B. (p)x (Q)y / (R)m (S)n
- C. (R)m (S)n / (p)x (Q)y
- D. m(R) n (S) / x(P) y (Q)
Which of the following equilibria shows little or no net reaction when the volume of the system is decreased?
- A. H2(g) + I2(g) β 2HI(g)
- B. 2NO2(g) β N2O4(g)O4(g)N2O4(g)
- C. PCI5(g) β PCI3(g) + CI2(g)
- D. ZnO(s) + CO2(g) β ZnCO3(g)
In what way is equilibrium constant for the forward reaction related to that of the reversed reaction?
- A. The additional of the two is expected to be one
- B. The product of the two is expected to be one
- C. The two equilibrium constants are identical
- D. The product of the two is always greater than one
In which of the following is the entropy change positive?
- A. H2O(I) β H2O(g)
- B. Cu2+(aq) + Fe(s) β Fe(2+) + Cu(s)
- C. N2(g) + 3H2(g) β 2NH3(g)
- D. 2HCI(s) β H2(g) + CI2(g)
\(MnO_2 + 2CI^- + 4H^+ β Mn^{2+} + CI_2 + 2H_2O\).
The changes in oxidation numbers when the manganese, chloride, and hydrogen ions react according to the above equation are respectively?
- A. 2, 2, 4
- B. -1, -2, 4
- C. -2, 1, 0
- D. 2, 4, 0
S2O2-3 + I2 β S2O62- + 2I–. In reaction above, the oxidizing agent is?
- A. S2O32-
- B. I2
- C. S4O62-
- D. I-
Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.
- A. 2.7
- B. 5.4
- C. 10.8
- D. 21.7