Chem grd 11 new mttest

Which of the following statements about ideal gases is/are correct? I. The cohesive forces between their particles are negligible. II. they have no definite volume, but occupy the volume of their containers. III. they are not compressible. IV. Their particles collide with loss of energy.

• I only

• I and II only

• I, II and III only

• I, II, lll and IV

Which of the following pairs of reagents react to produce hydrogen?

• Zinc and concentrated trioxonitrate (V) acid.

• Water and calcium dicarbide

• Copper and dilute hydrochloric acid

• Magnesium and dilute tetraoxosulphate (vI) acid

Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?.

• Copper turnings

• Copper (II) trioxocarbonate (IV)

• Copper (II) oxide

• Copper alloy

In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?

• CaO + 2HNO3 > Ca(NO3)2 +H2O

• Cu + 4HNO3> Cu(NO3)2 + 2H2O + 2NO2

• S + 6HNO2 > H2SO4 + 6NO2 + 2H2O

• P + 5HNO3> H3PO4 + 5NO2 + H2O

The gas evolved was

• NH3

• SO2

• HCI

• CO2

It can be concluded that gastric juice

• Contains enzymes

• Is acidic

• Is a mixture

• Has a pH value of 7

What does ∆H represent in the following equation? CI (g) + e- > Cl- ;∆H= -363 kJmol-1.

• Ionization energy

• Electron affinity

• Dissociation energy

• Heat of atomization

Consider the following equation: Ag+(aq) + Cl-(aq) > Ag+Cl- (s) ; ∆H = -65.7kjmol-1. from the equation, it can be deduced that

• direct combination is involved and the reaction is endothermic.

• a solid is formed and heat is evolved.

• activation energy is high and a catalyst is required.

• the reaction is endothermic and occurs at high temperature.

A reaction represented by the equation: A2(g) + B2(g) > 2 AB (g) ; ∆H = xkjmol-1. Which of the following statements about the system is correct?

• The forward reaction is exothermic

• The reaction goes to completion at equilibrium

• Pressure has no effect on the equilibrium mixture

• At equilibrium, Increase in temperature favours the reverse reaction.

What is the oxidation number of nitrogen in Al(NO3)2?

• +1

• +3

• +5

• +6