UNICAL Chemistry 2017/2018 Past Questions

Practice each question, then open it to see the full details.

25cm³ of a gas x contain z molecules at 1500c and 75mmHg. How many molecules will 25cm³ of another gas y contain at the same temperature and pressure?

A.2y
B.2z
C.z
D.y

What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
(H = 1, O = 16)

A.36.0g
B.8.0g
C.72.0g
D.16.0g

A particle that contains 9 proton, 10 neutrons and 10 electrons is a

A.negative atom ion
B.positive ion
C.neutral atom of a non-metal
D.neutral atom of metal

Cancerous growth are cured by exposure to

A.γ-rays
B.β- rays
C.A-rays
D.x-rays

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

A.32
B.20
C.14
D.12