Which of the following is correct about both compounds shown below? CH3CH 2CH2OH;CH 3
CH 2CH(OH)CH3
- A. They have identical physical properties
- B. They are structural isomers
- C. Their general molecular formula is the same
- D. They are oxidized to alkanones
C8H18 will undergo the following reactions except
- A. cracking
- B. combustion
- C. substitution
- D. addition
2 moles of hydrogen gas will react completely with one mole of….
- A. CH2=CHCl
- B. CH3-CH=CH2
- C. C6H5-CH3
- D. CH≡C-CH2-CH3
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?
- A. carry out some food tests
- B. examine the pastry sample under a microscope
- C. Do a chromatogram of the colouring extract
- D. .determine the molar mass of the colouring
Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes?
- A. The cathode becomes coated with copper
- B. Both electrodes gain electrons
- C. The blue colour of the solution fades gradually
- D. The anode increases in mass
0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI
- A. contains more ions
- B. is neutral to litmus
- C. has a lower molar mass
- D. has a higher pH
An iron nail placed in a solution copper (ll) tetraoxosulphate (VI) is soon covered with a deposit of copper. Which of the following equations represents the reactions ?
- A. Fe 2+ (aq) + Cu(s) → Fe 3+ + Cu 2+ (aq)
- B. Fe 2+ (aq) + Cu(s) → Fe(s) + Cu2+ (aq)
- C. Fe (s) + Cu2+ (aq) → Fe2+(aq) + Cu2+ (aq)
- D. Fe(s) + Cu2+ → Fe2+(aq) + Cu(s)
In which of the following is the oxidation number of sulphur equal to -2?
- A. S8
- B. H2S
- C. SO 2
- D. SO 3 2-
What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O
- A. 1
- B. 6
- C. 8
- D. 12
Which of the following will displace copper from a solution of copper (ll) salt?
- A. Aluminium ions
- B. Magnesium
- C. Silver
- D. Zinc ions
A finely divided form of a metal burns more readily in air than the rod form because the rod has
- A. higher molar mass
- B. smaller surface area
- C. protective oxide coating
- D. diferent chemical properties
What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = – xKJmol-1
- A. Decreases the value of ∆H
- B. Increases the collision rate of reactant particles
- C. Shifts equilibrium position to the right
- D. Reduces the time for attainment of equilibrium
Chemical equilibrium is attained when
- A. reactants in the system are used up
- B. concentrations of the products are greater than those of the reactants
- C. concentrations of the reactants and products remain constant
- D. reactants stop forming the products
What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?
- A. Redox reaction
- B. Destructive distillation
- C. Dehydration
- D. Nutralization
Which of the following salts is an acid salt?
- A. MgSO 37H 2O
- B. (NH 4) 2CO
- C. KHSO4
- D. CH3COONa
Which of the following compounds dissolves in water to give an alkaline solution?
- A. Ammonium chloride
- B. Sodium chloride
- C. Sulphur (IV) oxide
- D. Potassium oxide
Which of the following salts is stable to heat?
- A. K2CO3
- B. (NH4)2SO4
- C. NaHCO 3
- D. AgNO3
If a solution has a pH of 2, it can be concluded that it
- A. is a weak electrolyte
- B. has hyrogen ion concentration of 0.2 mol dm-3
- C. is twice as acidic as a solution of pH 1,
- D. will produce effervescence with magnesium ribbon
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
- A. hydrogen
- B. oxygen
- C. carbon (IV) oxide
- D. sulphur (VI) oxide
Which of the following gases is colourless, odourless and soluble in potassium hydroxide solution?
- A. NO 2
- B. SO 2
- C. NH 3
- D. CO2
9.60 g of a gas X occupies the same volume at 0.30 g of hydrogen under the same conditions. Calculate the molar mass of X [H = 1]
- A. 8g mol -1
- B. 16 gmol -1
- C. 32g mol -1
- D. 64g mol -1