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