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