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