Post Utme Chemistry Questions
Question 81:
A molar solution of caustic soda is prepared by dissolving ____________
- A \(40 \mathrm{~g} \mathrm{NaOH}\) in \(100 \mathrm{~g}\) of water
- B \(40 \mathrm{~g} \mathrm{NaOH}\) in \(1000 \mathrm{~g}\) of water
- C \(20 \mathrm{~g} \mathrm{NaOH}\) in \(500 \mathrm{~g}\) of solution
- D \(20 \mathrm{~g} \mathrm{NaOH}\) in \(1000 \mathrm{~g}\) of solution
- E \(20 \mathrm{~g} \mathrm{NaOH}\) in \(80 \mathrm{~g}\) of solution
Question 82:
Water is said to be hard if it ____________
- A Easily forms ice
- B Has to be warmed before sodium chloride dissolves in it
- C Forms an insoluble scum with soap
- D Contains nitrates
- E Contains sodium ions
Question 83:
Chemical substances are mentioned as<br/>I. Sour taste<br/>II. Slippery to touch<br/>III. Yields alkaline gas with ammonium salts<br/>IV. Has pH less than 7<br/>V. Turns phenolphthalein pink<br/><br/>Which of the above are NOT typical properties of alkali?
- A I, IV and V
- B IV and \(V\)
- C I and IV
- D II and V
- E II, III and IV
Question 84:
The movement of liquid molecules from the surface of the liquid into gaseous phase is known as ____________
- A Brownian motion
- B Condensation
- C Evaporation
- D Liquefaction
Question 85:
Ammonia gas is normally dried with ____________
- A Concentrated sulphuric acid
- B Quicklime
- C Anhydrous calcium chloride
- D Magnesium sulphate