Question 46:

• JAMB 2019

Which is the temperature of a given mass of a gas initially at and 9 atm, if the pressure is reduced to 3 atm at constant volume?

A. 91K
B. 182K
C. 273K
D. 819K
E. 429K

Question 47:

• JAMB 2019

Which of the following will have its mass increased when heated in air?

A. Helium
B. Magnesium
C. Copper pyrites
D. Glass

Question 48:

• JAMB 2019

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

Question 49:

• JAMB 2019

A gaseous metallic chloride MCl_x 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

Question 50:

• JAMB 2019

In which of the following are water molecules in the most disorderly arrangement?

A. Ice at -10°C
B. Ice at 0°C
C. Water at 100°C
D. Steam at 100°C