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