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