Chemistry Past Questions And Answers
The use of diamond in abrasives is due ti its
- A. high melting point
- B. durability
- C. lustre
- D. hardness
Sales ledger control account contains the total amount in respect of
- A. creditors
- B. debtors
- C. investors
- D. shareholders
What volume of 11.0M hydrochloric acid must be diluted to obtain 1dm3 of 0.05M acid?
- A) 0.05dm3
- B) 0.10dm3
- C) 0.55dm3
- D) 11.0dm3
Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations. If all the marble chips reacted; which of the following remained the same in each case?
- A. Average rate of evoluton of gas
- B. Total mass of gas evolved during the reaction
- C. Time taken for the reaction to reach completion
- D. Initial reaction rates
Proteins in acid solution undergo
- A. Polymerization
- B. Substitution
- C. Fermentation
- D. Hydrolysis
A colored gas that is known to be poisonous and can readily damage the mucous lining of the lungs is?
- A. hydrogen sulphide
- B. carbon(ii)oxide
- C. chlorine
- D. sulphur(iv)oxide
CuO + H\(_2\) \(\rightarrow\) Cu + H\(_2\)O. In the reaction above CuO is ______
- A) oxidized to copper
- B) reduced to copper
- C) chemically converted to copper
- D) reversed to copper
The most reactive halogen is:
- A) Cl2
- B) Br2
- C) F2
- D) I2
At 25o and zymase as catalyst, C6H126 → 2C2H5OH + 2CO2 + energy The reaction above represented by the equation above is useful in the production of
- A) propanol
- B) butanol
- C) methanol
- D) ethanol
2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3= 85, molar volume of gases at s.t.p. = 22.4dm3)
- A. 1.12dm3
- B. 2.24dm3
- C. 4.48dm3
- D. 11.2dm3