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