A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is?
[M = 27, Cl = 35.5]
- A. MCl
- B. MCl2
- C. MCl3
- D. M2Cl6
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]
- A. 0.3g
- B. 1.5g
- C. 2.4g
- D. 3.0g
Which of the following will have its mass increased when heated in air?
- A. Helium
- B. Magnesium
- C. Copper pyrites
- D. Glass
Which is the temperature of a given mass of a gas initially at 0°C and 9 atm, if the pressure is reduced to 3 atm at constant volume?
- A. 91K
- B. 182K
- C. 273K
- D. 819K
Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]
- A. Propane
- B. Oxygen
- C. Methane
- D. Ammonia
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]
- A. 11.00
- B. 22.00
- C. 33.00
- D. 44.00
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]
- A. 2.78g
- B. 5.56g
- C. 8.34g
- D. 11.12g