JAMB Chemistry Past Questions (2002)

Q1. A rock sample was added to cold dilute HNMO3. The gas evolved was passed into a solution of acidified K2Cr2O7 and the solution turned green. The rock sample contains

A. NO3-

B. Cl-

C. SO42-

D. SO32-

Answer: D

Q2. A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formular of the compound

A. KCLO3

B. KCLO4

C. KCLO

D. KCLO2

Answer: A

Q3. The solubility of a salt of molar mass 101g at 200C is 0.34mol dm-3. If 3.40g of the salt is dissolved completely in 250cm3 of water in a beaker, the resulting solution is

A. Unsaturated

B. A suspension

C. Saturated

D. Supersaturated

Answer: A

Q4. If 0.75 mole of cyclopropane and 0.66 mole of oxygen are mixed in a vessel with a total pressure of 0.7 atmosphere. What is the partial pressure of oxygen in the mixture

A. 0.55 atmosphere

B. 0.44 atmosphere

C. 0.33 atmosphere

D. 0.22 atmosphere

Answer: C

Q5. The most important use of hydrogen is in the

A. Hydrogenation of oils

B. Manufacture of methyl alcohol

C. Manufacture of ammonia

D. Manufacture of ethyl alcohol

Answer: C