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