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