PES SS 3 Chemistry Mock 1 Exam 2025-26
A) Mass number B) Atomic number C) Oxidation number D) Number of electrons
A) Calcium B) Silver C) Potassium D) Iron 
A) 2-chloro but-diene. B) 3 -chloro but -1.3-diene. C) 2- chloro but-I ,3-diene. D) But-1,3-chlorodiene.
A) Halides B) Anions C) Halogens D) Cations
A) +1 B) +6 C) +5 D) +3
A) C3H7OH B) C4H9OH C) CH3OH D) C2H5OH
A) All reactions cease to occur B) The reaction has gone to completion C) The rates of the forward and backward reactions are equal D) The amount of product equals the amount of reactants
A) Electrovalent B) Dative C) Covalent D) Hydrogen
A) Pauli's exclusion principle B) Afbau's principle C) Periodic law D) Hund's rule
A) Potassium B) Sodium C) Copper D) Zinc
A) Larger Atomic Size B) Greater number of valence electrons C) Smaller Atomic size D) Lower melting point
A) Hybridization of Orbitals B) Gaining of electrons C) Sharing electrons D) Losing of electrons
A) Hydrogen Sulphide B) Carbon (II) oxide C) Sewage D) Plastic
A) Nearness to raw materials B) Favourable climate condition C) Nearness to industrial establishment D) Availability of storage facilities
A) Water B) Carbon (IV) oxide C) Ethene D) Oxygen
A) Positional B) Functional C) Geometrical D) Optical
A) C3H8O B) C6H12O C) C12H12O11 D) C6H12O2
A) partial pressure B) Vapour pressure C) Total pressure D) Atmospheric pressure
A) Distillation B) Chromatography C) Crystalization D) Electrolysis
A) Core electrons B) Valence electrons C) Valence shells D) Electrons
A) Spontaneous B) Exothermic C) Endothermic D) Slow
A) Constant composition B) conservation of energy C) conservation of mass D) Multiple proportion
A) 0.40 mol B) 0.25 mol C) 0.20 mol D) 0.50 mol
A) form cations B) form colourless salts C) are metals D) have same number of valence electrons
A) Saturated B) Diluted C) Unsaturated D) Concentrated
A) A field B) An orbital C) A quanta D) A spectra
A) Dissolve in polar solvent B) Have mobile electrons C) Conduct electricity in its solid state D) Have low boiling points
A) 965 C B) 9650 C C) 9.65 C D) 96500 C
A) Saponification B) Halogenation C) Carboxylation D) esterification
A) Ethene B) Methane C) Hydrogen D) Sulphur
A) Pentane B) Hexane C) Benzene D) Propane
A) the filling of degenerated orbitals B) quantum numbers of electrons C) quantity of electrons in the valence shell D) filling the orbitals with lower energy first
A) they belong to the same period B) of the difference in their boiling points C) nitrogen is less dense than oxygen D) oxygen is more reactive than nitrogen
A) 0.08gdm−3 B) 2.00gdm−3 C) 80.00gdm−3 D) 8.00gdm−3
A) hydrogen atoms in its aqueous solution B) hydrogen ions in its aqueous solution C) double anions in its aqueous solution D) a single cation in its aqueous solution
A) heat of formation of reactants exceeds heat of formation of products B) bond forming energy exceeds bond breaking energy C) reaction vessel feels cool during the reaction D) enthalpy change is negative
A) NH3 B) CH4 C) NaH D) HCl
A) C2H4 B) C3H6 C) C3H4 D) C4H8
A) 96.0g B) 80.0g C) 76.0g D) 66.0g
A) valence electrons increase across the period while the valence shell remains constant B) nuclear charge decreases while the outermost electrons are drawn closer to the nucleus C) nuclear charge decreases while the distance of the valence shell from the nucleus is increasing D) nuclear charge increases while the outermost electrons are drawn closer to the nucleus
A) +5 B) +4 C) +2 D) +3
A) K B) Mg C) Na D) Al
A) high melting point B) hardness C) octahedral shape D) durability
A) 100.00 B) 1000.00 C) 10.00 D) 0.01
A) have same density B) have octahedral shape C) form carbon(IV) oxide on combustion D) conduct electricity
A) an acid B) an oxidizing agent C) a reducing agent D) a base
A) 0.0245g B) 0.245g C) 0.049g D) 0.490g 
A) 40°C B) 30°C C) 0°C D) 20°C
A) electrochemical reactions B) mechanism of electrolysis C) electrolytic reactions D) nature of the electrode
A) 1s orbital B) 2s orbital C) 2px D) 3s orbital
A) sand B) fire blanket C) water D) carbon(IV) oxide
A) Evolution of ammonia when heated with ammonium salts B) Evolution of carbon dioxide gas when added to a trioxocarbonate (IV) salt C) Formation of salt and hydrogen gas with reactive metals D) Formation of salt and water with alkalis
A) 2.4 × 1022 B) 1.2 × 1023 C) 1.2 × 1022 D) 2.4 × 1023
A) Na2SO4 B) CuSO4 C) PbSO4 D) FeSO4
A) manufacture of cement B) production of ammonia C) combustion D) photosynthesis
A) 75cm3 B) 25cm3 C) 30cm3 D) 150cm3
A) mass B) colour C) heat capacity D) boiling point
A) > 7 B) = 7 C) < 7 D) 0
A) Ionization potential B) Electron Affinity C) Electronegativity D) Catalytic ability
A) vibrational and random motion B) random and translational motion C) vibrational and translational motion D) vibrational motion |
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