Chemistry Past Questions And Answers
501
Oxyacetylene flame is used for iron-welding because it
- A. Makes the iron metals solidify very quickly
- B. Combines with oxygen to give a pop sound
- C. Evolves a lot of heat when burnt
- D. Dissociates to produce carbon (IV) oxide and oxygen
502
Which of the following statements is true when sulphur atom forms its ion?
- A) It achieves an inert configuration
- B) It transfers two electrons in the process
- C) It accepts one electron in the process
- D) It gets oxidized in the process
503
Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ΔH = -65.7 kJmol-1. From the equation, it can be deduced that
- A. direct combination is involved and the reaction is endothermic
- B. a solid is formed and heat is evolved
- C. activation energy is high and a catalyst is required
- D. the reaction is endothermic and occurs at high temperature
504
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
- A) volume
- B) mass
- C) pressure
- D) temperature
505
A chemical widely used as a fertilizer is?
- A. galena
- B. bauxite
- C. emerald
- D. nitrochalk
506
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
- A. Steam distillation
- B. Destructive distillation
- C. Liquefication
- D. Hydrolysis
507
Ethanoic acid is
- A. tribasic
- B. unionizeable
- C. monobasic
- D. dibasic
508
Brass is an alloy containing copper and
- A) zinc
- B) tin
- C) aluminum
- D) silver
509
The initial volume of a gas at 300 K was 220cm3 Determine its temperature if the volume became 250cm3
- A. 183 K
- B. 264 K
- C. 300 K
- D. 341 K
510
In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?
- A. the anode is a silver rod and the cathode is the spoon
- B. the anode is the spoon and the cathode is a silver rod
- C. the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod.
- D. the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon