An arrangement of two different metals in aqueous solutions of their salts to produce an electronic current is known as
- A. electrochemical cell
- B. activity series
- C. thermocouple
- D. voltameter
- E. galvanometer
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