Chemistry Past Questions and Answers

In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?

A Ethanoic acid, milk or magnesia, sodium chloride, hydrochloric acid and sodium hydroxide
B Ethanoic acid, hydrochloric acid, milk of magnesia, sodium chloride and sodium chloride and sodium hydroxide
C Hydrochloride acid, ethanol acid, sodium chloride, milk of magnesia and sodium hydroxide
D Hydrochloride acid, sodium hydroxide sodium chloride, ethanol acid, and milk of magnesia

Question 522:

If 24.83 cm3 of 0.15 M NaOH is titrated to its end point with 39.45 cm3 of HCl, what is the molarity of the HCl?

A 0.094 M
B 0.150 M
C 0.940 M
D 1.500 M

Question 523:

The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?

A Ionic
B Covalent
C Neutral
D Co-ordinate

Question 524:

If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?

A R = k/âˆšd
B R = kd
C R =k/d
D R = k âˆšd

Question 525:

An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?

A Neutrons 53, Protons 17
B Neutrons 17, Protons 36
C Neutrons 19, Protons 17
D Neutrons 36, Protons 17