Chemistry Past Questions and Answers

Under high pressure, real gases do not obey gas laws because their molecules?

A Have become more energetic
B Have become less energetic
C Have become smaller in size
D Decompose into atoms
E Start repelling each other

Question 167:

How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm<sup style='font-size: smaller;'>3</sup> of 6M HCl? <br/>(Mg=24, H=1, Cl=35.5)

A 1.2 g
B 0.7 g
C 0.5 g
D 0.3 g
E 0.12 g

Question 168:

Which of the following statements is an exception in the assumptions of the kinetic theory of gases?

A Gases are composed of many elastic particles
B The particles are of negligible size
C The particles are in constant random motion
D The particles are of negligible mass
E The particles collide with each other

Question 169:

Which of the following statements is true?

A Metals conduct electricity while non-metals do not
B Metals have high density, non-metals have low density
C Metals form basic oxides, non-metals form acidic oxides
D In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
E Metals lose elections while non-metals gain electron during normal reactions

Question 170:

The boiling point of water is higher than that of methanol because?

A Water is oxide while methanol is an alcohol
B Inter molecular forces in water are stronger than those in methanol
C Water is an inorganic compound while methanol is organic
D Water is an ionic compound while methanol is a covalent compound
E Water is more reactive than methanol