Diamond does not conduct electricity because it

A. has no free valence electrons

B. is a giant molecule

C. contains no bonded electrons

D. is a solid at room temperature

Which of the following set of equations could be used to represent the standard enthalpy of formation of glucose?

A. 6C _(s) + 6H _2(g) + 3O_2(g) → C ₆H₁₂O_6(s)

B. 6CO_2(g) + 6H₂O _(l) → C₆H₁₂O_6(s) + 6O _2(g)

C. 6C_(g) + 6H _2(g) + 3O_2(g) → C₆H₁₂O _6(s)

D. 6C_(g) + 6H _2(g) + 3O_2(g) → C ₆H ₁₂O _6(aq)

The colour of phenolphthalein indicator in dilute HNO is

A. colourless

B. orange

C. pink

D. purple

An aqueous solution of CaCI₂ is

A. acidic solution

B. alkaline solution

C. a buffer solution

D. a neutral solution

Which of the following compounds would dissolved in water to give a solution whose pH is less than 7?

A. AI(NO₃)₃

B. KNO₃

C. N₂O

D. NH₃

Consider the reaction represented by the question below: KOH_(aq) + HCI_(aq) → KCI_(aq) + H₂O_(l) What volume of 0.25 mol dm^-3 KOH would be required to completely neutralize 40 cm³ of 0.10 mol dm ^-3 HCI?

A. 40 cm³

B. 32cm³

C. 24cm³

D. 16cm³

When 100 cm³ of a saturated solution of KCIO₃ at 40^oC is evaporated, 14 g of the salt is recovered what is the solubility of KCIO₃ at 40^oC? [KCIO₃ = 122.5]

A. 11.42 mol dm^-3

B. 8.80 mol dm^-3

C. 14 mol dm^-3

D. 0.88 mol dm^-3

The high solubility of ethanol in water is due to its

A. low boiling point

B. low freezing point

C. covalent nature

D. hydrogen bonding

Consider the equilibrium reaction represented by the equation: 2SO_2(g) + O_2(g) ⇌ 2SO_3(g) ∆H = - 197 kJmol^-1. At equilibrium, increase in the total pressure of the system brings about

A. decrease in rate of the reaction of the system

B. decrease in temperature of the system

C. increase in temperature of SO₃

D. increase in concentration of SO₂

In dry Leclanche cell, manganese (IV) oxide acts as

A. a reducing agent

B. binding agent

C. catalyst

D. depolarizer