43
The acid anhydride that will produce weak acid in water is
- A. SO3
- B. NO2
- C. SO2
- D. CO2
44
Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of
- A. CaCO3
- B. Na2CO3
- C. Na2SO4
- D. CaSO4
45
The tincture of iodine means iodine dissolved in
- A. ethanol
- B. bromine chloride
- C. chlorine water
- D. water
46
Aluminium hydroxide is used in the dyeing industry as a
- A. dye
- B. dispersant
- C. salt
- D. mordant
47
The shape of the S-orbital is
- A. elliptical
- B. spiral
- C. circular
- D. spherical
48
The constituent common to duralumin and alnico is
- A. Co
- B. Mn
- C. Al
- D. Mg
49
The general formula of alkanones is
- A. RCHO
- B. RCOR'
- C. RCOOH
- D. RCOOR