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