PES SS 2 Chemistry Mock 3 Exam 2024/25
A) Methane B) Sulphur C) Ethene D) Hydrogen
A) Benzene B) Pentane C) Hexane D) Propane
A) reduction B) oxidation C) sublimation D) decomposition
A) quantity of electrons in the valence shell B) filling the orbitals with lower energy first C) quantum numbers of electrons D) the filling of degenerated orbitals
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) 0.08gdm−3 B) 8.00gdm−3 C) 2.00gdm−3 D) 80.00gdm−3
A) double anions in its aqueous solution B) a single cation in its aqueous solution C) hydrogen atoms in its aqueous solution D) hydrogen ions in its aqueous solution
A) enthalpy change is negative B) bond forming energy exceeds bond breaking energy C) heat of formation of reactants exceeds heat of formation of products D) reaction vessel feels cool during the reaction
A) HCl B) CH4 C) NaH D) NH3
A) C4H8 B) C3H4 C) C2H4 D) C3H6
A) 96.0g B) 66.0g C) 80.0g 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) valence electrons increase across the period while the valence shell remains constant D) nuclear charge increases while the outermost electrons are drawn closer to the nucleus
A) +3 B) +4 C) +5 D) +2
A) K B) Al C) Mg D) Na
A) size of the positive nuclear charge B) distance of the outermost electron(s) from the nucleus C) ability to attract shared electron(s) D) screening effect of the inner electron(s)
A) Hydrogen bond is formed between a metal and a non-metal B) Ionic compounds in solution would conduct electricity C) Covalent compounds would readily ionize in solution D) Covalent compounds consist of ions
A) durability B) octahedral shape C) high melting point D) hardness
A) A catalyst is required B) Heat energy is absorbed C) Activation energy is high D) It occurs reversibly
A) 100.00 B) 10.00 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) a reducing agent B) an acid C) an oxidizing agent D) a base
A) decomposition B) hydrolysis C) ozonolysis D) dehydration
A) 0.049g B) 0.245g C) 0.0245g D) 0.490g
A) distilling it B) reducing its quantity C) increasing the external pressure D) decreasing the external pressure 
A) 40°C B) 30°C C) 0°C D) 20°C
A) dissolves and the solution becomes super saturated B) dissolves and the solution becomes unsaturated C) dissolves and crystals are formed D) precipitates and the solution remains unchanged
A) propanoic acid B) propanol C) propyne D) propane
A) electrolytic reactions B) nature of the electrode C) mechanism of electrolysis D) electrolytic reactions
A) 2s orbital B) 2px C) 3s orbital D) 1s orbital
A) sand B) carbon(IV) oxide C) fire blanket D) water
A) Formation of salt and hydrogen gas with reactive metals B) Evolution of ammonia when heated with ammonium salts C) Formation of salt and water with alkalis D) Evolution of carbon dioxide gas when added to a trioxocarbonate (IV) salt
A) 1.2 × 1022 B) 1.2 × 1023 C) 2.4 × 1023 D) 2.4 × 1022
A) CH2 B) CH3 C) CH D) CH4
A) bases B) acids C) alkalis D) salts
A) it is a covalent compound B) each of potassium and chlorine structures contain noble gas structure C) strong cohesive forces make its ions immobile D) strong cohesive force makes its molecule immobile
A) Na2SO4 B) CuSO4 C) FeSO4 D) PbSO4
A) photosynthesis B) combustion C) manufacture of cement D) production of ammonia
A) 150cm3 B) 25cm3 C) 75cm3 D) 30cm3
A) mass B) heat capacity C) colour D) boiling point
A) > 7 B) = 7 C) < 7 D) 0
A) reduced B) oxidised C) decomposed D) dissociated
A) +3 to 0 B) +2 to +3 C) +3 to +2 D) 0 to +2
A) ions are reduced B) electrons are consumed C) the electrode dissolves D) oxidation is involved
A) +2 to 0 B) +2 to -2 C) +4 to +2 D) +2 to +4
A) They have the same molecular formula B) The chemical property change gradually throughout the series C) Successive members undergo changes in molecular formula by CH2 D) physical properties of members are similar
A) 6.40g B) 0.64g C) 0.67g D) 0.45g
A) number of carbon atoms present in the compound B) molecular formula of the compound C) molecular mass of the compound D) number of alkyl groups bonded to the carbon having the hydroxyl group
A) propyl butanoate B) butyl propanoate C) pentyl propanoate D) propyl pentanoate
A) increases as nuclear charge increases B) decreases as nuclear charge decreases C) remains constant as nuclear charge increases D) decreases as nuclear charge increases
A) 2:1 B) 2:3 C) 1:2 D) 1:1
A) do not conduct electricity B) cannot be attracted by electromagnetic field C) contain equal number of protons and electrons D) are composed of neutrons and electrons
A) Nitrogen(II) oxide and Carbon(IV) oxide B) Carbon(II) oxide and oxygen C) Carbon(II) oxide and Sulphur(IV) oxide D) Carbon(IV) oxide and Nitrogen
A) mannose B) sucrose C) maltose D) galactose
A) 1-chloroethanol B) 2-chloropropanol C) 2-chloroethanol D) 1- chloropropanol
A) corrosive effect of the chemicals on humans and animals B) excessive ultraviolet light from the sun to reach the earth surface C) excessive release of infrared light from the sun to the earth surface D) acidic effect of chemicals on humans
A) can be recycled after use B) is formed naturally C) is cheap D) cannot be regenerated once used up
A) vibrational motion B) vibrational and random motion C) random and translational motion D) vibrational and translational motion
A) 0.2gdm−3 B) 2.0gdm−3 C) 5.0gdm−3 D) 1.0gdm−3
A) activation energy B) free energy C) equilibrium position D) enthalpy change
A) Solubility in water B) Crystalline nature C) Relative density D) Melting point |
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