Chemistry Past Questions and Answers

Hydrogen is readily released when dilute hydrochloric acid reacts with

A Cu
B Na
C Au
D Ag

Question 37:

The intermediate product formed when ethanol is progressively oxidized to ethanoic acid with potassium heptaoxodichromate (IV) is

A Butanal
B Ethanal
C Methanal
D Propanal

Question 38:

A rock sample was added to cold dilute HNO₃. The gas evolved was passed into a solution of acidified K₂Cr₂O₇ and the solution turned green. The sample contains

A Cl^-
B NO₃^-
C SO₃^2-
D SO₄^2-

Question 39:

Which of the following statement is true of a proton?

A The mass of a proton is 1840 times the mass of electron
B The total mass of the protons in a particular nucleus is always half the nuclear size
C The mass of a proton is one - twelfth the molar mass of carbon
D The mass of a proton is 1.0008g

Question 40:

Which of the following chloride would exhibit the least ionic character?

A MgCl₂
B CaCl₂
C LiCl
D AlCl₃