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