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