An insoluble salt can be prepared by Options

• A) the reaction of trioxocarbonate (V) with an acid
• B) double decomposition
• C) the action of dilute acid on an insoluble base
• D) the reaction of metals with an acid

Which of the following are isomers?

• A. Ethanol and dimethyl ether
• B. Benzene and methybenzene
• C. Ethanol and propanone
• D. Trichloromethane and tetrachloromethane

Which of the following is an electrolyte?

• A. Alcohol
• B. Sodium acetate solution
• C. Solid potassium hydroxide
• D. Mercury

N2O4(aq) ⇌ 2NO2(g) △ H = +ve In the reaction above, an increase in temperature will

• A) Increase the reactant production
• B) Increase the value of the equilibrium constant
• C) Shift the equilibrium to the left
• D) Decrease the value of the equilibrium constant

The process of rusting is an example of the formation of

• A. Basic oxide
• B. Acidic oxide
• C. Reducing oxide
• D. Amphoteric oxide

The rate of the hydrogen in the reaction Zn(s) + 2HCI (aq) → ZnCI 2(g) + H₂(aq) + H₂(g) can be increased by

• A. using Zinc powder instead of Zinc granules
• B. using dilute instead of concentrated hydrochloric acid
• C. cooling the container in which the mixture is placed
• D. using an alloy of zinc instead of pure zinc

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as

• A. Tyndal effect
• A. Tyndal effect B. diffusion
• C. osmosis
• D. brownian movement

What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm³ cylinder? [R=0.082 atm dm^-3 mol^-1 K^-1]

• A. 0.32
• B. 1.52
• C. 3.13
• D. 31.25

What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?

• A. A white precipitate is formed
• B. A green precipitate is formed
• C. The mixture remains colourless
• D. The mixture turns reddish brown

Substance Q reacts with cold water to form a solution which turns red litmus blue. Substance Q could be

• A. zinc
• B. phosphorus
• C. lead
• D. sodium