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