The following acids are monobasic except
- A. trioxonitrate (V) acid
- B. hydrochloric
- C. ethanoic acid
- D. tetraoxophosphorus (V) acid
- E. dioxonitrate (lll) acid
Amphoteric oxides are oxides which
- A. react with water to form acids
- B. react with water to form alkali
- C. show neither acid nor basic properties
- D. react with acids alkalis
- E. contain high proportion of oxygen
Which of the following equations represents a neutralization reaction?
- A. CaCI2 + 2HCI →CI2 +CaCI 2 + H2O
- B. Na2O2 + H2SO4 → Na2SO4 + H2O2
- C. H2SO4 + KOH → KHSO4 + H2 O
- D. 2Na + 2H2O → 2NaOH + H2
- E. CuSO4 + 2NaOH → Cu(OH)2+ Na2SO4
A solution of pH 7 is
- A. acidic
- B. neutral
- C. concentrated
- D. dilute
- E. saturated
What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]
- A. 11.20dm3
- B. 5.60dm3
- C. 2.24dm3
- D. 0.56dm3
- E. 0.28dm3
”Equal volumes of all gases at the same temperature and pressure contain the same number of molecules” is an expression of
- A. Charles Law
- B. Boyle's Law
- C. Avogadro's Law
- D. Graham's Law
- E. Gay Lussac's Law
What is the likely formula of compound formed between element M in group two and element X in group seven?
- A. M7X2
- B. M2X
- C. M2X7
- D. MX2
- E. MX6
The alkali metals exhibit similar chemical properties because
- A. they occur in the combined state
- B. they have the same number of vallence electrons
- C. they form crystalline salts
- D. their salts are soluble in water
- E. they are highly reactive
When an atom gains an electron, it becomes
- A. chemically inactive
- B. negatively charged
- C. oxidized
- D. a cation
- E. a complex ion
The existance of two or more forms of the same element in the same physical state is known as
- A. allotropy
- B. resonance
- C. hybridization
- D. isotopy
- E. isomerism
A sample of air that has been passed through caustic potash will
- A. contain more oxygen than nitrogen
- B. rekindle a glowing splint
- C. have no action on lime water
- D. contain no water vapour
- E. be free of noble gases
Chlorine is prepared on a large scale by the
- A. electrolysis of concentrated sodium chloride solution
- B. action of manganese (IV) oxide on hot concentrated hydrochloric acid
- C. action of concentrated tetraoxosulphate (IV) acid on sodium chloride
- D. oxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII)
- E. action of dilute mineral acids on bleaching powder
Which of the following oxides is amphoteric?
- A. Na2O
- B. Fe2O3
- C. AI2O3
- D. CaO
- E. CuO
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
- A. 0.1 mole
- B. 0.2mole
- C. 0.3 mole
- D. 1.0 mole
- E. 2.9 moles
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
- A. 0.1 mole
- B. 0.2mole
- C. 0.3 mole
- D. 1.0 mole
- E. 2.9 moles
The following salts dissolve readily in cold water except
- A. CaCI2
- B. PbSO4
- C. (NH4)2SO4
- D. Na2CO3
- E. Na2SO3
Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it
- A. prevents the growth of algae
- B. coagulates suspended particles
- C. neutralizes dissolved gases in water
- D. reacts with any excess chlorine present
- E. increases the amount of dissolved oxygen
Metals which react with steam only when they are red-hot include
- A. copper
- B. sodium
- C. calcium
- D. gold
- E. iron
The function of limestone in the extraction of iron in the blast furnace is
- A. removal of the earthly impurities
- B. decomposition of the iron ore
- C. conversion of iron (lll) to iron (ll) compounds
- D. generation of heat for the process
- E. conversion of coke to carbon(ll)oxide
Which of the following is an alloy of mercury?
- A. Stainless steel
- B. Soft solder
- C. Coinage bronze
- D. Amalgam
- E. Duralumin
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
- A. CH3CH2OH
- B. (CH3)2CHCH2OH
- C. (CH3)3CCH2OH
- D. (CH3)3COH
- E. CH3CH2CH2CH2OH