PES SS 2 Chemistry Mock 3 Exam 2024/25
A) Sulphur B) Methane C) Hydrogen D) Ethene
A) Hexane B) Pentane C) Benzene D) Propane
A) oxidation B) sublimation C) reduction D) decomposition
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) 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) 8.00gdm−3 B) 80.00gdm−3 C) 0.08gdm−3 D) 2.00gdm−3
A) hydrogen atoms in its aqueous solution B) hydrogen ions in its aqueous solution C) a single cation in its aqueous solution D) double anions in its aqueous solution
A) enthalpy change is negative B) bond forming energy exceeds bond breaking energy C) reaction vessel feels cool during the reaction D) heat of formation of reactants exceeds heat of formation of products
A) NH3 B) CH4 C) HCl D) NaH
A) C2H4 B) C3H4 C) C3H6 D) C4H8
A) 96.0g B) 66.0g C) 76.0g D) 80.0g
A) nuclear charge decreases while the distance of the valence shell from the nucleus is increasing B) nuclear charge increases while the outermost electrons are drawn closer to the nucleus 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) +2 B) +5 C) +3 D) +4
A) Na B) Mg C) K D) Al
A) size of the positive nuclear charge B) screening effect of the inner electron(s) C) distance of the outermost electron(s) from the nucleus D) ability to attract shared electron(s)
A) Ionic compounds in solution would conduct electricity B) Covalent compounds would readily ionize in solution C) Covalent compounds consist of ions D) Hydrogen bond is formed between a metal and a non-metal
A) high melting point B) durability C) hardness D) octahedral shape
A) A catalyst is required B) Activation energy is high C) It occurs reversibly D) Heat energy is absorbed
A) 10.00 B) 0.01 C) 100.00 D) 1000.00
A) form carbon(IV) oxide on combustion B) have same density C) have octahedral shape D) conduct electricity
A) a reducing agent B) an acid C) an oxidizing agent D) a base
A) dehydration B) ozonolysis C) decomposition D) hydrolysis
A) 0.245g B) 0.490g C) 0.049g D) 0.0245g
A) decreasing the external pressure B) increasing the external pressure C) reducing its quantity D) distilling it 
A) 0°C B) 30°C C) 20°C D) 40°C
A) precipitates and the solution remains unchanged B) dissolves and the solution becomes super saturated C) dissolves and the solution becomes unsaturated D) dissolves and crystals are formed
A) propanol B) propane C) propyne D) propanoic acid
A) nature of the electrode B) mechanism of electrolysis C) electrolytic reactions D) electrolytic reactions
A) 2s orbital B) 3s orbital C) 2px D) 1s orbital
A) water B) sand C) fire blanket D) carbon(IV) oxide
A) Formation of salt and water with alkalis B) Formation of salt and hydrogen gas with reactive metals C) Evolution of ammonia when heated with ammonium salts D) Evolution of carbon dioxide gas when added to a trioxocarbonate (IV) salt
A) 2.4 × 1022 B) 2.4 × 1023 C) 1.2 × 1022 D) 1.2 × 1023
A) CH B) CH4 C) CH2 D) CH3
A) acids B) alkalis C) bases D) salts
A) it is a covalent compound B) strong cohesive forces make its ions immobile C) each of potassium and chlorine structures contain noble gas structure D) strong cohesive force makes its molecule immobile
A) CuSO4 B) Na2SO4 C) PbSO4 D) FeSO4
A) combustion B) production of ammonia C) photosynthesis D) manufacture of cement
A) 30cm3 B) 75cm3 C) 150cm3 D) 25cm3
A) heat capacity B) boiling point C) colour D) mass
A) < 7 B) 0 C) = 7 D) > 7
A) decomposed B) oxidised C) reduced D) dissociated
A) +3 to +2 B) +3 to 0 C) +2 to +3 D) 0 to +2
A) oxidation is involved B) the electrode dissolves C) electrons are consumed D) ions are reduced
A) +2 to 0 B) +4 to +2 C) +2 to +4 D) +2 to -2
A) Successive members undergo changes in molecular formula by CH2 B) The chemical property change gradually throughout the series C) physical properties of members are similar D) They have the same molecular formula
A) 6.40g B) 0.64g C) 0.45g D) 0.67g
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 pentanoate B) pentyl propanoate C) propyl butanoate D) butyl propanoate
A) remains constant as nuclear charge increases B) decreases as nuclear charge increases C) decreases as nuclear charge decreases D) increases as nuclear charge increases
A) 2:3 B) 1:2 C) 1:1 D) 2:1
A) cannot be attracted by electromagnetic field B) are composed of neutrons and electrons C) do not conduct electricity D) contain equal number of protons and electrons
A) Carbon(IV) oxide and Nitrogen B) Carbon(II) oxide and Sulphur(IV) oxide C) Carbon(II) oxide and oxygen D) Nitrogen(II) oxide and Carbon(IV) oxide
A) galactose B) mannose C) sucrose D) maltose
A) 1-chloroethanol B) 2-chloropropanol C) 2-chloroethanol D) 1- chloropropanol
A) corrosive effect of the chemicals on humans and animals B) acidic effect of chemicals on humans C) excessive release of infrared light from the sun to the earth surface D) excessive ultraviolet light from the sun to reach the earth surface
A) cannot be regenerated once used up B) can be recycled after use C) is formed naturally D) is cheap
A) vibrational and random motion B) random and translational motion C) vibrational motion D) vibrational and translational motion
A) 0.2gdm−3 B) 2.0gdm−3 C) 1.0gdm−3 D) 5.0gdm−3
A) free energy B) equilibrium position C) activation energy D) enthalpy change
A) Crystalline nature B) Solubility in water C) Relative density D) Melting point |
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