1: Which of the following statements is INCORRECT?
A. Tin is used for making food cans.
B Sulphur acid is used for making soap.
C. Ammonium chloride is used for making dry cells.
D. Chlorine is used for sterilizing drinking water.
2:A solution of chlorine in tetrachloromethane is shaken with an aqueous solution of a compound X in atest. On standing, two layers are formed in the test tube and the lower layer is violet in colour. X may be
A. sodium fluoride B. sodium bromide
C. sodium iodide D. sodium sulphite
3: Which of the following substances, when mixed, will undergo a reaction?
A. vinegar and anti-acid
B. bleach and anti-acid
C. vinegar and table salt
D. bleach and table salt
4: A gardener bought a bag of potassium nitrate and a bag of ammonium sulphate, to be used as fertilizers. He forgot to label the bags. Which of the following tests would enable him to distinguish between the two chemicals?
A. heating each chemical with dilute sulphuric acid
B. heating each chemical with sodium chloride solution
C. heating each chemical with potassium hydroxide solution
D. heating each chemical with acidified potassium dichromate solution
5: In which of the following reactions does sulphur dioxide act as a reducing agent?
(1) the production of sulphuric acid in the contact process
(2) the bleaching of a red petal
(3) the decolorization of bromine water
A. (1)&(2)only B. (1)&(3)only
C. (2)&(3)only D. (1),(2)&(3)
6: Which of the following statements concerning the Haber Process is INCORRECT?
A. Iron is used as a catalyst in the process
B. The reaction involved in the process is reversible
C. The reaction involved in the process is exothermic
D. The process is performed at one atmosphere pressure
7: Which of the following elements are essential for plant growth?
(1) potassium (2) phosphorus
(3) silicon (4) nitrogen
A. (1),(2)&(3)only B. (1),(2)&(4)only
C. (1),(3)&(4)only D. (2),(3)&(4)only
俾埋解釋ㄚ Thx ^^