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