Chemistry Quiz

The fraction of collisions that results in chemical reaction is called ____

• minimum collision

• effective collision

• frequency of collision

• maximum collision

The minimum energy required for a chemical reaction to start is called ____

• activation complex

• activation energy

• collision complex

• heat of reaction

When a reaction is endothermic, the energy, E involved is written as ____

• E = -∆H

• E = ∆H

• E = +∆H

• None of the above

An example of dynamic equilibrium is ____

• a seasaw

• dissolution and deposition

• burning of paper

• rusting of iron

Which of the following would make the reaction proceed in forward direction?

2SO_2(g) + O_2(g) → 2SO_3(g) ∆H = - xkJmol^-1

• Decreasing the concentration of SO2

• Decreasing the concentration of O2

• Increasing the pressure

• decreasing the pressure

Chlorine can be prepared industrially by the electrolysis of _____

• potassium trioxochlorate (V)

• brine

• hydrochloric acid

• ammonium chloride

When X is reacted with aluminium, hydrogen is produced. Then X is ____

• H₂SO₄

• KOH

• CH₃OH

• ZnCO₃

What is the name of the following reaction?

CaCO_3(s) → CaO_(s) + CO_2(g)

• Double decomposition

• Oxidation

• Thermal decomposition

• Neutralization

The atomic numbers of elements X and Y are 13 and 16 respectively. Which of the following compounds is likely to be formed by the combination of the two elements?

• XY

• X₂Y₃

• XY₃

• X₂Y

Which of the following pairs of elements forms amphoteric oxides with oxygen?

• Be and Mg

• Zn and Al

• Na and K

• Si and Pb