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