The coloured nature of transition metal ions are associated with their partially filled

• A) f- orbital
• B) s- orbital
• C) p-orbital
• D) d-orbital

Steam changes the colour of anhydrous cobalt (ll) chloride from

• A) white to red
• B) blue to white
• C) blue to pink
• D) white to blue

In general, an increase in temperature increases the solubility of a solute in water because?

• A. more solute molecules collide with each other
• B. most solutes dissolve with the evoltion of heat
• C. more solute molecules dissociate at hihger temperatures
• D. most solutes dissolve with absorption of heat

The vapour pressure of a liquid depends on: I. Temperature II. rate of condensation III. Cohesive forces holding the particles together.

• A. I
• B. I and II
• C. I and III
• D. II and III

Choose the correct option from the graph above. 3Fe(S) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g). The equilibrium constant, K, of the reaction above is represented as

• A) A
• B) B
• C) C
• D) D

The solution with the lowest pH value is

• A. 5 ml of (m/10) HCL
• B. 10 ml of (m/10) HCL
• C. 15 ml of (m/5) HCL
• D. 20 ml of (m/8) HCL

To which group and period respectively does an element with 15 electrons belong?

• A. 3 and 3
• B. 3 and 5
• C. 5 and 3
• D. 5 and 5

A difference between chemical and physical change is that in a chemical change

• A. oxygen is consumed
• B. heat is supplied
• C. a reversible process oocurs
• D. a new substance is formed

Metals are said to be malleable because they

• A. are good conductors heat
• B. are good conductors of electricity
• C. can be beaten into sheets
• D. can be alloyed

2SO2(g) + O2(g) ⟺ 2SO3(g) △ H = − 395.7 k J m o l − 1 In the reaction above, the concentration of 2SO3(g) can be in creased by

• A) decreasing the pressure
• B) decreasing the temperature
• C) the addition of catalyst
• D) increasing the temperature