Chemistry Past Questions And Answers
Hydrogen can be displaced from a hot alkaline solution by
- A. Fe
- B. Cu
- C. Ca
- D. Sn
70cm\(^3\) of hydrogen are sparked with 25cm\(^3\) of oxygen at S.T.P. The total volume of the residual gas is
- A)20cm\(^3\)
- B)35cm\(^3\)
- C)45cm\(^3\)
- D)25cm\(^3\)
When Copper (II) chloride solution is treated with excess aqueous ammonia, a deep blue solution results. This is due to the presence of
- A. (CuNH4)3+ ion
- B. (CuCl4)2- ion
- C. (Cu(NH3)4)2+ ion
- D. (Cu(OH)4)2- ion
A consequences of global warming is
- A. Air pollution
- B. Flooding
- C. Increased humidity
- D. Water pollution
The enzyme used in the hydrolysis of starch to dextrin and maltose is
- A) amylase
- B) diastatse
- C) invertase
- D) zymase
Chlorine gas is commonly used in the production of which of the following industrial compounds?
- A. Chlorofluorocarbons (CFCs)
- B. Methane
- C. Ammonia
- D. Ethanol
The IUPAC nomenclature of the compound above is
- A) 2-bromo-3-chlorobutanol
- B) 3-bromo-2-chlorobutanol
- C) 3-chloro-2-bromobutanol
- D) 2-chloro-3-bromobutanol
In which of the following compounds does hydrogen form ionic compounds?
- A. CH4
- B. HCl
- C. NH3
- D. NaH
What volume of 1.5M solution of KOH would contain 0.045 moles
- A) 67.50 cm3
- B) 30.00 cm3
- C) 6.75 cm3
- D) 3.00 cm3
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
- A. Volume
- B. Mass
- C. pressure from age grades
- D. Temperature