What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm3 solution? [K2CrO4 = 194.2g/mol]

• A. 0.97g
• B. 9.70g
• C. 19.42g
• D. 97.10g

When heat is absorbed during a chemical reaction, the reaction is said to be

• A. thermodynamic
• B. exothermic
• C. isothermal
• D. endothermic

The reaction of an alkene with hydrogen in the presence of catalyst is

• A. a substitution reaction
• B. an oxidation reaction
• C. a nucleophilic reaction
• D. an addition reaction

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

Which of the following, in clear solution, forms a white precipitate when carbon (IV) oxide is bubbled into it for a short time?

• A. KOH
• B. NaOH
• C. Ca(OH)₂
• D. AI(OH)₃

Which of the following statements is not correct?

• A. Carbon exhibits allotropy.
• B. Sulphur exhibits allotropy
• C. Chlorine exhibits allotropy.
• D.Hydrogen is a gas.

Air boiled out of water as steam is richer in

• A) nitrogen and oxygen
• B) carbon (IV) oxide and oxygen
• C) noble gases and carbon (IV) oxide
• D) oxygen and noble gases

When substance X was added to a solution of bromine water, the solution became colourless. X is likely to be

• A. propane
• B. propanoic acid
• C. propyne
• D. propanol

Which of the following movements can be described as random motion?

• A. wheelbarrow being pushed
• B. car travelling on a straight line
• C. Gas molecules colliding in a flask
• D. Planets going round the sun

Which of the following compound is used for removing impurities from bauxite?

• A. NaOH
• B. CaCO₃
• C. Na₃AIF₆
• D. H₂SO₆