1 What happens to the solubility of most solid solutes in water when temperature increases? A It decreases B It increases C It remains the same D It first increases then decreases
2 In a mass spectrometer, the ions are separated on the basis of their: A mass-to-charge ratio B colour C temperature D solubility
3 A solution that cannot dissolve any more solute at a given temperature is called: A Unsaturated solution B Saturated solution C Supersaturated solution D Dilute solution
4 The change of state from liquid to gas is called: A Melting B Freezing C Evaporation D Condensation
5 The relative atomic mass of an element is calculated by comparing the mass of its atom with the mass of: A Carbon-12 atom B Hydrogen-1 atom C Oxygen-16 atom D Nitrogen-14 atom
6 Which of the following is an example of a suspension? A Sugar solution B Milk C Muddy water D Vinegar
7 Rutherford's gold foil experiment led to the discovery of the: A electron B proton C neutron D nucleus
9 Which of the following is a homogeneous mixture? A Sand and water B Oil and water C Salt solution D Mud and water
10 The formula for relative atomic mass is: A Sum of (isotopic mass × abundance) ÷ 100 B Sum of masses of protons and electrons C Mass number × atomic number D Neutrons ÷ protons
11 Which subatomic particle was discovered by J. J. Thomson through his experiments with cathode rays? A Neutron B Electron C Proton D Nucleus
12 A solution that contains the maximum amount of solute that can be dissolved at a given temperature is called: A Unsaturated solution B Saturated solution C Supersaturated solution D Dilute solution
13 The atomic mass unit (amu) is defined relative to which isotope? A Carbon-12 B Carbon-13 C Oxygen-16 D Hydrogen-1
15 The solubility of a gas in a liquid generally ______ with an increase in temperature. A increases B decreases C remains the same D first increases then decreases
16 Which of the following shows the Tyndall effect? A Salt solution B Sugar solution C Colloidal solution D Pure water
17 Which separation method is used to separate a mixture of sand and water? A Filtration B Distillation C Sublimation D Chromatography
18 Atomic number (Z) represents the number of: A protons in the nucleus B neutrons in the nucleus C electrons and neutrons D protons and neutrons
19 Which subatomic particle was discovered by James Chadwick? A Electron B Proton C Neutron D Nucleus
20 Which of the following is a property of a compound? A Its components can be separated by physical means B It has a variable composition C Its components are combined in a fixed ratio by mass D It shows the properties of its constituent elements
21 The mass number (A) of an atom is equal to: A Number of protons B Number of neutrons C Number of protons + neutrons D Number of electrons
22 Who discovered the electron through cathode ray discharge tube experiments? A J. J. Thomson B E. Goldstein C James Chadwick D Ernest Rutherford
23 The mass number (A) of an atom is the sum of: A Protons and electrons B Neutrons and electrons C Protons and neutrons D Electrons only
24 The atomic number of an element is equal to the number of: A Neutrons B Protons C Nucleons D Isotopes
25 How does the solubility of most gases in water change with an increase in temperature? A It increases B It decreases C It remains the same D It first increases then decreases