Jamb Chemistry Past Questions For Year 1999

Question 6

Which of the compounds above would react to take up two molecules of bromine durng bromination?

jamb 1999

• A. l only
• B. lll only
• C. l and ll only
• D. ll and lll only

Question 7

56.00cm³ of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas?

[Molar volume of a gas at S.T.P = 22.4dm³]

jamb 1999

• A. 11.00
• B. 22.00
• C. 33.00
• D. 44.00

Question 8

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.

[Pb = 207, Cl= 35.5, N = 14, O = 16]

jamb 1999

• A. 2.78g
• B. 5.56g
• C. 8.34g
• D. 11.12g

Question 9

A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is?

[M = 27, Cl = 35.5]

jamb 1999

• A. MCl
• B. MCl₂
• C. MCl₃
• D. M₂Cl₆

Question 10

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

From the equation above, the mass of magnesium required to react with 250cm3 of 0.5M HCl is

[Mg = 24]

jamb 1999

• A. 0.3g
• B. 1.5g
• C. 2.4g
• D. 3.0g