Which of the following halogens is solid at room temperature?

• A. Bromine
• B. Chlorine
• C. Flourine
• D. Iodine

Which of the following statements is true regarding the melting and boiling points of pure substances?

• A. The boiling point is always higher than the melting point
• B. The melting point is always higher than the boiling point
• C. The melting and boiling points are always the same for all substances
• D. The melting and boiling points can vary depending on the substance

What takes place at the cathode during electrolysis?

• A. Anions lose electrons
• B. Anions are oxidized
• C. Cations are oxidized
• D. Cations are discharged.

Pauli exclusion principle is related to

• A. quantity of electrons in the valence shell
• B. filling the orbitals with lower energy first
• C. the filling of degenerated orbitals
• D. quantum numbers of electrons

When chlorine is added to slaked lime, the product obtained is

• A. bleaching powder
• B. chlorinated water
• C. hydrochloric acid
• D. oxochlorate (l) acid

The relationship between the density, D of a gas and the rate (r) at which the gas diffuses is

• A)
  r = Kd
• B)
  r = Kd\(^{-\frac{1}{2}}\)
• C)
  r = Kd\(^{\frac{1}{2}}\)
• D)
  r = Kd\(^{-1}\)

Which of the following decrease when a given mass of gas is compressed to half its initial volume?

• A. Atomic radius of each
• B. Average intermolecular distance
• C. Frequency of collisions
• D. Number of molecules presents

Which of the following instruments is used in detecting the presence of radiation?

• A. Cathode ray tube
• B. Geiger-Muller counter
• C. Mass spectrometer
• D. X-ray tube

Which of the following substances would not produce ethanol when fermented?

• A. Cane sugar
• B. Glucose
• C. Starch
• D. Vinegar

A substance is said to be hygroscopic if it absorbs

• A. water from the atmosphere to form a solution
• B. heat from the surrounding
• C. carbon (IV) oxide from the atmosphere
• D. moisture from the atmosphere without dissolving