Post Utme Chemistry Past Questions and Answers

Question 326:

How many grams of methyl acetylene (propane) \(CH_3-C=CH \)will completely discharge the colour of 8g of bromine? (Br = 80, C = 12, H = 1)

A. 0.5
B. 1.0
C. 2.0
D. 3.0
E. 4.0

Question 327:

Brass is an alloy containing copper and ____________

A. Zinc
B. Tin
C. Aluminium
D. Silver
E. Lead

Question 328:

60cm³ of hydrogen are sparked with 20cm³ of oxygen at 100˚c and 1 atmosphere. The total volume of the residual gases is ____________

A. 60 cm³
B. 10 cm³
C. 40 cm³
D. 30 cm³
E. 70 cm³

Question 329:

If the rate of diffusion of oxygen gas is taken as 1, what will be the rate of diffusion of methane whose relative molar mass is 16?

A. 2.0
B. 1.8
C. 1.4
D. 1.0
E. 0 .5

Question 330:

What is the molecular formula of a compound whose empirical formula is \(\mathrm{CH}_{2} \mathrm{O}\) and molar mass is 180 ?
(H=1, C=12,0=16)

A. \(\mathrm{C}_{s} \mathrm{H}_{\mathrm{u}} \mathrm{O}_{c}\)
B. \(\mathrm{C}_{4} \mathrm{H}_{4} \mathrm{O}_{1}\)
C. \(\mathrm{C}_{3} \mathrm{H}_{12} \mathrm{O}_{3}\)
D. \(\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}_{2}\)