Revision 2

Which of the following sets of properties of matter belongs to gases?

(SPE/2009/Q7)

• No fixed volume, no fixed shape and move in all directions.

• No fixed volume, fixed shape and move in all directions.

• Have fixed volume, no fixed shape and do not move.

• Have fixed volume, fixed shape and do not move.

Figure below represents three states of water, labeled X, Y and Z.

Which of the following correctly identifies the states of water in figure above?

(SPE/2017/Q13)

• X - Liquid

  Y - Gas

  Z - Solid

• X - Liquid

  Y - Solid

  Z - Gas

• X - Solid

  Y - Liquid

  Z - Gas

• X - Solid

  Y - Gas

  Z - Liquid

The closed flask shown in figure below contains a compound Q in the solid, liquid and gaseous states. Which statement is correct?  (SPE/2012/Q24)

• Gaseous Q particles move freely in all directions.

• Gaseous Q particles vibrate at fixed positions.

• Liquid Q particles move freely in all directions.

• Solid Q particles can move freely in the flask.

Study figure below carefully. It shows a conical flask filled with water and a crystal of potassium permanganate dropped carefully in it. After a few days, the water in the beaker turned purple. What is the process which causes this observation?

(SPE/2009/Q26)

 

• Osmosis.

• Diffusion.

• Melting.

• Evaporation.

In the experiment shown in figure below, state what is observed when the cover is

removed and explain why this happened. (SPE/2011/Q34)

• Reddish brown vapour remains at the bottom gas jar because Bromine gas molecules are heavy and so remain at the bottom gas jar.

• Reddish brown vapour takes a long time to spread throughout both gas jars because Bromine gas molecules are heavy and move slower and so take a longer time to move upwards.

• Reddish brown vapour spreads throughout both gas jars very quickly because Bromine gas molecules move at high speed and are in constant random motion.

• More reddish brown vapour remains at the bottom gas jar because The air molecules occupy the top gas jar and force the bromine gas molecules to remains at the bottom gas jar.

Study the experiment in Figure below.

Based on the results observed, which of the following conclusions drawn from the two experiments is correct?  (SPE/2015/Q9)

• Copper (ll) sulfate particles diffused faster in solid than in liquid.

• Copper (ll) sulfate particles diffused faster in liquid than in solid.

• Copper (ll) sulfate particles diffused slower in gas than in liquid.

• Copper (ll) sulfate particles diffused slower in gas than in solid.

The Periodic Table is very important in scientific studies. What is shown by the symbols in the Periodic Table? (SPE/2010/Q10)

• Compounds.

• Elements.

• Mixtures.

• Molecules.

Which of the following compounds contains three elements? (SPE/2011/Q13)

• Calcium carbonate, CaCO₃

• Nitrogen dioxide, NO₂

• Sodium chloride NaCl

• Water, H₂O

Which of the following is a correct property of compound?    (SPE/2013/Q11)

• They are formed by chemical reactions.

• They can be broken down by physical methods.

• The constituents are presents in variable amounts.

• No new products are formed from their reactions.

Which is a mixture of compounds ONLY?

(SPE/2012/Q25)

• Air.

• Bronze.

• Seawater.

• Water.