Jamb 2017 Chemistry Past Questions And Answers
The salt formed from a weak acid and a strong base hydrolyzes in water to form
- A) A saturated solution
- B) an acidic solution
- C) a buffer solution
- D) an alkaline solution
In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using a solution of
- A) an hydrous CaCl4
- B) concentrated NaCO4
- C) dilute NaOH
- D) concentrated H4SO4
The gas that can be collected by downward displacement of air is
- A) chlorine
- B) sulphur (IV) oxide
- C) carbon (IV) oxide
- D) ammonia
The constituent of air necessary in the rusting process are
- A) O2 and H2O
- B) Ar and CO2
- C) CO2 and H2O
- D) O2 and CO2
If 100cm3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]
- A) 10.0s
- B) 12.5s
- C) 17.7s
- D) 32.0s
The oxidation number of iodine in KIO3is
- A) +7
- B) +3
- C) +5
- D) +6
The shape of ammonia molecules is
- A) trigonal planar
- B) octahedral
- C) square planar
- D) tetrahedral
In the diagram below. X is
- A) SO3
- B) SO2
- C) S
- D) H2S
A given mass of gas occupies 2dm3at 300k. At what temperature will its volume be doubled, keeping the pressure constant?
- A) 400k
- B) 480k
- C) 550k
- D) 600k
The reaction of halogens in the presence of sunlight is an example of
- A) oxidation reaction
- B) addition reaction
- C) hydrogenation reaction
- D) substitution reaction