Chemistry Past Questions And Answers
3231
Catalytic hydrogenation of benzene produces?
- A. an aromatic hydrocarbon
- B. margarine
- C. cyclohexane
- D. D.D.T
3232
The name of the gas driven off at the negative electrode during the electrolysis of brine is ________
- A) hydrogen
- B) chlorine
- C) oxygen
- D) sodium
3233
Zn + 2HCL → ZnCl\(_2\) + H\(_2\)
What happens to zinc in the above reaction?
- A. oxidized
- B. a reactant
- C. reduced
- D. a metal
3234
Quicklime has the formula ______
- A)Ca(OH)\(_2\)
- B)CaO
- C)CaCO\(_3\)
- D)CaSO\(_4\).2H\(_2\)O
3235
The molecule which has a linear shape is
- A. CH4
- B. NH3
- C. H2S
- D. CO2
3236
The alkaline earth metals have similar chemical properties because?
- A. They are in the same period
- B. Their salts are colourless
- C. They have the same number of valence electrons
- D. They are very reactive
3237
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
3238
A secondary alkanol can be oxidized to give an
- A)alkanone
- B) alkyne
- C) alkanoic acid
- D)alkanal
3239
Nitrogen is prepared on a large scale by the
- A. fractional distillation of liquefied air
- B. decomposition of ammonium dioxonitrate (lll)
- C. electrolysis of brine
- D. Haber process
3240
35cm3 of hydrogen sparked with 12cm3 of oxygen, at 110° and 760mmHg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?
- A) 11%
- B) 31%
- C) 35%
- D) 69%