The volume of 0.25 mol/dm³ solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00)

• A. 464.30 cm³
• B. 625.00 cm³
• C. 1000.00 cm³
• D. 2153.80 cm³

The mass of silver deposited when a current of 10a is passed through a solution of silver salt for 4830s is [Ag = 108, F = 96500 c mol-1]

• A. 108.0g
• B. 54.0g
• C. 27.0g
• D. 13.5gq

Which of the following statements about elements in Group VII is correct?

• A. Br₂ will oxidize CI^-
• B. F₂ has the least tendency to be reduced
• C. Cl₂ will oxidize I^-
• D. l₂ is a stronger oxidizing agent than F₂

Which of these does not affect the rate of a particular chemical reaction?

• A) The order of the reaction
• B) The size of the particle of the reactants
• C) The temperature of the reaction
• D) The concentration of reactants

The tincture of iodine means iodine dissolved in

• A. ethanol
• B. bromine chloride
• C. chlorine water
• D. water

How many valence electrons are contained in the element³¹₁₅P?

• A. 3
• B. 4
• C. 15
• D. 31

One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?

• A. an alkane
• B. an alkene
• C. an alkyne
• D. aromatic (C = 12, H = 1)

If 30cm3 of gas at 50oC is warmed to 80o at a fixed pressure, the fractional increase in volume is

• A. 0.009
• B. 0.093
• C. 0.910
• D. 1.090

The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their

• A. physical states
• B. melting points
• C. Rf. values
• D. solubility

Consider the reaction represented by the equation. 2NaHCO₃(s) → 2Na2CO₃(S) + CO₂(g) + H₂O(g) what volume of carbon (IV)oxide at s.t.p is evolved when 0. 5 moles of NaHCO₃ is heated? [Molar volume = 22.4 dm³ at s.t. p]

• A. 1.12dm³
• B. 2.24dm³
• C. 5.6dm³
• D. 56.0dm³