1 Which method is suitable for separating a mixture of two miscible liquids with different boiling points? A Filtration B Sublimation C Fractional distillation D Magnetic separation
2 Which of the following is an example of a homogeneous mixture? A Oil and water B Sand and iron filings C Salt solution D Muddy water
3 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
4 Which allotrope of carbon is the hardest natural substance? A Graphite B Diamond C Fullerene D Charcoal
5 The process in which a solid changes directly into a gas without passing through the liquid state is called: A Evaporation B Sublimation C Condensation D Melting
6 The relative atomic mass of an element is the: A sum of masses of all isotopes B weighted average of the masses of its isotopes C mass of the most abundant isotope D mass of the lightest isotope
7 Which method is used to separate a mixture of sand and water? A Filtration B Distillation C Sublimation D Chromatography
8 What is the effect of increasing temperature on the solubility of a gas in a liquid? A Solubility increases B Solubility decreases C Solubility remains the same D Solubility first increases then decreases
9 Which method is used to separate a mixture of two liquids with different boiling points? A Filtration B Distillation C Sublimation D Chromatography
10 The atomic number of an element is equal to the number of: A Neutrons B Protons C Nucleons D Isotopes
12 Which of the following is used in a mass spectrometer to bend the path of ions? A Electric field only B Magnetic field only C Electric and magnetic fields D Gravitational field
13 Which of the following particles was discovered by J. J. Thomson? A Proton B Neutron C Electron D Nucleus
14 Isotopes are atoms of the same element that have different: A number of protons B number of electrons C number of neutrons D atomic number
15 Which branch of chemistry deals with the study of environmental pollution and its control? A Polymer chemistry B Nuclear chemistry C Environmental chemistry D Geochemistry
16 Which of the following is an example of a physical change? A Burning of wood B Melting of ice C Rusting of iron D Digestion of food
17 Which effect is shown by colloidal particles when a beam of light passes through them? A Tyndall effect B Brownian effect C Doppler effect D Photoelectric effect
18 The solubility of most solids in water ______ with an increase in temperature. A decreases B increases C remains the same D becomes zero
20 Who discovered the electron through cathode ray discharge tube experiments? A J. J. Thomson B E. Goldstein C James Chadwick D Ernest Rutherford
21 One atomic mass unit (amu) is equal to: A 1/12 the mass of a carbon-12 atom B Mass of one proton only C Mass of one electron only D Mass of one neutron and one proton
22 Which branch of chemistry deals with the study of compounds of carbon? A Inorganic chemistry B Organic chemistry C Physical chemistry D Analytical chemistry
24 Isotopes of an element have the same number of protons but different number of: A Electrons B Neutrons C Orbits D Ions