1 A reaction in which two molecules join to form a larger molecule with a double bond is called: A Substitution B Addition C Cracking D Combustion
2 Which of the following is a structural isomer of butane (C4H10)? A 2-methylpropane B 2-methylbutane C Propane D Pentane
3 A random error is best reduced by: A Using a faulty instrument B Taking a single reading quickly C Repeating measurements and averaging the results D Ignoring the smallest scale division
4 Which reagent is used to test for unsaturation in alkenes? A Bromine water B Lime water C Sodium chloride solution D Copper sulphate solution
5 Which type of fire extinguisher is suitable for flammable liquid fires? A Water extinguisher B Foam extinguisher C Carbon dioxide extinguisher D Sand bucket
7 What should you use to put out a small fire in the lab? A Water B Fire blanket or sand C Your lab coat D Paper
8 A measurement that is both accurate and precise is: A Close to the true value and to other readings B Close to the true value but not to other readings C Close to other readings but not to the true value D Far from both the true value and other readings
9 The combustion of alkanes is an example of: A Substitution reaction B Addition reaction C Exothermic reaction D Endothermic reaction
10 Which type of glove is commonly used in school laboratories for handling chemicals? A Woolen gloves B Leather gloves C Nitrile or latex gloves D Cotton gloves
11 Which PPE is worn to protect the eyes from chemical splashes? A Lab coat B Gloves C Safety goggles D Closed shoes
13 Which type of fire extinguisher is safe to use on electrical fires? A Carbon dioxide extinguisher B Water extinguisher C Foam extinguisher D Sand bucket
14 What should be done before using a balance in an experiment? A Calibrate it and set it to zero B Fill it with water C Heat it strongly D Shake it well
15 Which of the following is the correct IUPAC name for CH3-CH2-CH3? A Methane B Ethane C Propane D Butane
16 The process of separating hydrocarbons from petroleum is called: A Fractional distillation B Cracking C Combustion D Halogenation
17 When measuring the volume of a liquid with a measuring cylinder, the most appropriate choice depends mainly on the: A Colour of the liquid B Required precision and volume range C Temperature of the room D Shape of the test tube rack
18 Which of the following is not a characteristic of alkanes? A They are saturated B They undergo addition reactions C They burn in air D They undergo substitution reactions
19 What does the acronym PASS stand for when using a fire extinguisher? A Pull, Aim, Squeeze, Sweep B Push, Aim, Spray, Stop C Pull, Alert, Spray, Secure D Point, Aim, Shoot, Sweep
20 What should you do if you inhale harmful fumes in the lab? A Move to fresh air and inform the teacher B Stay in the same place and continue C Breathe deeply in the lab D Open a chemical bottle to check
22 What is the first step when a chemical spills in the lab? A Ignore it and continue working B Inform the teacher and follow safety instructions C Clean it with your bare hands D Add water to it
23 The closeness of repeated measurements to each other is called: A Accuracy B Precision C Systematic error D Parallax
25 Which of the following is a source of hydrocarbons? A Coal B Petroleum C Natural gas D All of these